Second-Generation Antipsychotics

Chemistry and Pharmacodynamics

Chemical structure

Medications in this class

• Aripiprazole
• Asenapine
• Brexpiprazole
• Cariprazine
• Clozapine
• Iloperidone
• Lumateperone
• Lurasidone
• Olanzapine
• Paliperidone
• Pimavanserin
• Quetiapine
• Risperidone
• Ziprasidone

Mechanism of action

• Higher affinity for 5-hydroxytryptamine 5-hydroxytryptamine A biochemical messenger and regulator, synthesized from the essential amino acid l-tryptophan. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Receptors and Neurotransmitters of the CNS ( 5-HT 5-HT A biochemical messenger and regulator, synthesized from the essential amino acid l-tryptophan. In humans it is found primarily in the central nervous system, gastrointestinal tract, and blood platelets. Serotonin mediates several important physiological functions including neurotransmission, gastrointestinal motility, hemostasis, and cardiovascular integrity. Receptors and Neurotransmitters of the CNS) 2A receptors Receptors Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors than for D2 receptors Receptors Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors
• Lower affinity for D2 receptors Receptors Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors than 1st-generation antipsychotics ( FGAs FGAs Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics)
• Blockade of postsynaptic dopamine Dopamine One of the catecholamine neurotransmitters in the brain. It is derived from tyrosine and is the precursor to norepinephrine and epinephrine. Dopamine is a major transmitter in the extrapyramidal system of the brain, and important in regulating movement. Receptors and Neurotransmitters of the CNS D2 receptors Receptors Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors:
  • Blockade in mesolimbic pathway → relief of “positive” psychotic symptoms Psychotic symptoms Brief Psychotic Disorder 
  • Blockade in mesocortical, nigrostriatal, and tuberoinfundibular pathways → adverse side effects

Physiologic effects

• Antipsychotic Antipsychotic Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics effects: reduce dopaminergic positive symptoms in schizophrenia Schizophrenia Schizophrenia is a chronic mental health disorder characterized by the presence of psychotic symptoms such as delusions or hallucinations. The signs and symptoms of schizophrenia are traditionally separated into 2 groups: positive (delusions, hallucinations, and disorganized speech or behavior) and negative (flat affect, avolition, anhedonia, poor attention, and alogia). Schizophrenia
  • Delusions
  • Hallucinations Hallucinations Subjectively experienced sensations in the absence of an appropriate stimulus, but which are regarded by the individual as real. They may be of organic origin or associated with mental disorders. Schizophrenia
  • Paranoia
  • Mania Mania A state of elevated excitement with over-activity sometimes accompanied with psychotic symptoms (e.g., psychomotor agitation, inflated self esteem and flight of ideas). It is often associated with mental disorders (e.g., cyclothymic disorder; and bipolar diseases). Bipolar Disorder
  • Aggressiveness
• Antidepressive effects
• EEG EEG Seizures effects:
  • Pattern shifts in EEG EEG Seizures frequencies (slowing and increasing synchronization)
  • Lower the seizure threshold Threshold Minimum voltage necessary to generate an action potential (an all-or-none response) Skeletal Muscle Contraction

Pharmacokinetics

The 2nd-generation antipsychotics (SGAs) differ significantly from one another in pharmacokinetics Pharmacokinetics Pharmacokinetics is the science that analyzes how the human body interacts with a drug. Pharmacokinetics examines how the drug is absorbed, distributed, metabolized, and excreted by the body. Pharmacokinetics and Pharmacodynamics. These agents are available as oral tablets/capsules (asenapine is a sublingual tablet or transdermal patch Patch Nonpalpable lesion > 1 cm in diameter Generalized and Localized Rashes), and some are also available as IM injections. Most SGAs are metabolized by the hepatic microsomal enzyme system called cytochrome P450 Cytochrome P450 A superfamily of hundreds of closely related hemeproteins found throughout the phylogenetic spectrum, from animals, plants, fungi, to bacteria. They include numerous complex monooxygenases (mixed function oxygenases). In animals, these p450 enzymes serve two major functions: (1) biosynthesis of steroids, fatty acids, and bile acids; (2) metabolism of endogenous and a wide variety of exogenous substrates, such as toxins and drugs (biotransformation). They are classified, according to their sequence similarities rather than functions, into cyp gene families (>40% homology) and subfamilies (>59% homology). For example, enzymes from the cyp1, cyp2, and cyp3 gene families are responsible for most drug metabolism. Drug-induced Liver Injury (abbreviated CYP followed by numbers and letters for the gene Gene A category of nucleic acid sequences that function as units of heredity and which code for the basic instructions for the development, reproduction, and maintenance of organisms. Basic Terms of Genetics family and subfamily).

2nd-generation antipsychotics with modes of administration other than oral

• IM injection: 
  • Aripiprazole
  • Olanzapine
  • Paliperidone 
  • Risperidone
  • Ziprasidone
• Transdermal patch Patch Nonpalpable lesion > 1 cm in diameter Generalized and Localized Rashes: Asenapine

Specific pharmacokinetics Pharmacokinetics Pharmacokinetics is the science that analyzes how the human body interacts with a drug. Pharmacokinetics examines how the drug is absorbed, distributed, metabolized, and excreted by the body. Pharmacokinetics and Pharmacodynamics for SGAs

• Aripiprazole:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 87% (oral); 100% (IM)
  • 99% protein-bound
  • Metabolized by CYP2D6 and CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers) (poor CYP2D6 metabolizers have 60% increased active drug exposure)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics of parent drug: 75 hours
  • Excretion: feces (55%) and urine (25%)
• Asenapine:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: sublingual, 35%; oral, ≤ 2%; also available as a transdermal patch Patch Nonpalpable lesion > 1 cm in diameter Generalized and Localized Rashes
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 0.5–1.5 hours
  • 95% protein-bound
  • Metabolized by the uridine diphosphate Uridine diphosphate A uracil nucleotide containing a pyrophosphate group esterified to C5 of the sugar moiety. Purine and Pyrimidine Metabolism (UDP) glucuronosyltransferase system (UGT): UGT1A4 and CYP1A2
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: oral tablets, 24 hours; transdermal patch Patch Nonpalpable lesion > 1 cm in diameter Generalized and Localized Rashes, 30 hours
  • Excretion: urine (50%) and feces (40%) 
• Brexpiprazole:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 95%
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 4 hours
  • > 99% protein-bound to serum albumin Albumin Serum albumin from humans. It is an essential carrier of both endogenous substances, such as fatty acids and bilirubin, and of xenobiotics in the blood. Liver Function Tests and alpha-1-acid glycoprotein
  • Metabolized by CYP2D6 and CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers) enzymes Enzymes Enzymes are complex protein biocatalysts that accelerate chemical reactions without being consumed by them. Due to the body’s constant metabolic needs, the absence of enzymes would make life unsustainable, as reactions would occur too slowly without these molecules. Basics of Enzymes: individuals who are poor CYP2D6 metabolizers have 4.8-fold increased active drug exposure.
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 3.8 days
  • Excretion: urine (25%) and feces (46%) 
• Cariprazine:
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 3–6 hours
  • 91%–97% protein-bound
  • Metabolized by CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers) (extensively) and CYP2D6 (to a lesser extent)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 2–4 days
  • Excretion: urine
• Clozapine:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 50%–60%
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 1.5–2.5 hours
  • 97% protein-bound
  • Metabolized by CYP1A2, CYP2D6, and CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 12 hours
  • Excretion: urine (50%) and feces (30%)
• Iloperidone:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 96%
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 2–4 hours
  • 95% protein-bound
  • Metabolized by CYP2D6 and CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 18 hours
  • Excretion: urine (45%–58%) and feces (20%–22%)
• Lumateperone:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 4.4%
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 1–2 hours
  • 97.4% protein-bound
  • Metabolized by CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers), other CYPs, and UGT glucuronidation
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 18 hours
  • Excretion: urine (58%) and feces (29%)
• Lurasidone:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 9%–19%
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 1–2 hours
  • 99% protein-bound
  • Metabolized by CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 18 hours
  • Excretion: feces (80%) and urine (9%)
• Olanzapine:
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 6 hours (oral); 15–45 minutes (short-acting IM), 7 days (extended-release IM)
  • 93% protein-bound
  • Extensively metabolized through CYP1A2, 2D6, and UGT1A4 enzymes Enzymes Enzymes are complex protein biocatalysts that accelerate chemical reactions without being consumed by them. Due to the body’s constant metabolic needs, the absence of enzymes would make life unsustainable, as reactions would occur too slowly without these molecules. Basics of Enzymes
  • Metabolites are inactive.
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 21–54 hours (immediate-release); 30 days (extended-release)
  • Excretion: urine (57%) and feces (30%)
• Paliperidone:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 28%
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 24 hours (oral), 13 days (IM)
  • 74% protein-bound
  • Metabolized by CYP2D6 and CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 23 hours (oral); 25–49 days (IM)
  • Excretion: urine (80%) and feces (11%)
• Pimavanserin:
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 6 hours 
  • Approximately 95% protein-bound
  • Predominantly metabolized by CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers) and CYP3A5
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 2.4 days; active metabolites half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 8.3 days
  • Excreted after 10 days in urine and feces
• Quetiapine:
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 1.5 hours (immediate-release) 6 hours (extended-release)
  • 83% protein-bound
  • Metabolized in the liver Liver The liver is the largest gland in the human body. The liver is found in the superior right quadrant of the abdomen and weighs approximately 1.5 kilograms. Its main functions are detoxification, metabolism, nutrient storage (e.g., iron and vitamins), synthesis of coagulation factors, formation of bile, filtration, and storage of blood. Liver: Anatomy by CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 6 hours (immediate-release); 7–12 hours (extended-release)
  • Excretion: urine (73%) and feces (20%)
• Risperidone:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 70%
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time, steady state Steady state Enzyme Kinetics: 4–6 hours
  • 90% protein-bound
  • Metabolized in the liver Liver The liver is the largest gland in the human body. The liver is found in the superior right quadrant of the abdomen and weighs approximately 1.5 kilograms. Its main functions are detoxification, metabolism, nutrient storage (e.g., iron and vitamins), synthesis of coagulation factors, formation of bile, filtration, and storage of blood. Liver: Anatomy by CYP2D6
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 3 hours for extensive metabolizers and 20 hours for poor metabolizers
  • Excretion: urine (70%) and feces (14%)
• Ziprasidone:
  • Bioavailability Bioavailability Pharmacokinetics and Pharmacodynamics: 60% (oral); 100% (IM)
  • Peak plasma Plasma The residual portion of blood that is left after removal of blood cells by centrifugation without prior blood coagulation. Transfusion Products time: 6–8 hours (oral) and < 60 minutes (IM)
  • 99% protein-bound
  • Metabolized in liver Liver The liver is the largest gland in the human body. The liver is found in the superior right quadrant of the abdomen and weighs approximately 1.5 kilograms. Its main functions are detoxification, metabolism, nutrient storage (e.g., iron and vitamins), synthesis of coagulation factors, formation of bile, filtration, and storage of blood. Liver: Anatomy by CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers)
  • Half-life Half-Life The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacologic, physiologic, or radiologic activity. Pharmacokinetics and Pharmacodynamics: 7 hours (oral); 2–5 hours (IM)
  • Excretion: feces (66%) and urine (20%)

Indications and Advantages

The 2nd-generation antipsychotics have comparable efficacy for psychosis; clozapine is also effective in treating schizophrenia Schizophrenia Schizophrenia is a chronic mental health disorder characterized by the presence of psychotic symptoms such as delusions or hallucinations. The signs and symptoms of schizophrenia are traditionally separated into 2 groups: positive (delusions, hallucinations, and disorganized speech or behavior) and negative (flat affect, avolition, anhedonia, poor attention, and alogia). Schizophrenia, specifically treatment-resistant cases.

Indications

• Schizophrenia Schizophrenia Schizophrenia is a chronic mental health disorder characterized by the presence of psychotic symptoms such as delusions or hallucinations. The signs and symptoms of schizophrenia are traditionally separated into 2 groups: positive (delusions, hallucinations, and disorganized speech or behavior) and negative (flat affect, avolition, anhedonia, poor attention, and alogia). Schizophrenia:
  • Reduce positive symptoms (delusions, hallucinations Hallucinations Subjectively experienced sensations in the absence of an appropriate stimulus, but which are regarded by the individual as real. They may be of organic origin or associated with mental disorders. Schizophrenia) 
  • May be more effective at reducing neurocognitive impairment
• Bipolar disorder Bipolar disorder Bipolar disorder is a highly recurrent psychiatric illness characterized by periods of manic/hypomanic features (distractibility, impulsivity, increased activity, decreased sleep, talkativeness, grandiosity, flight of ideas) with or without depressive symptoms. Bipolar Disorder:
  • Several SGAs can be used in conjunction with mood stabilizers (e.g., lithium Lithium An element in the alkali metals family. It has the atomic symbol li, atomic number 3, and atomic weight [6. 938; 6. 997]. Salts of lithium are used in treating bipolar disorder. Ebstein’s Anomaly) during acute mania Mania A state of elevated excitement with over-activity sometimes accompanied with psychotic symptoms (e.g., psychomotor agitation, inflated self esteem and flight of ideas). It is often associated with mental disorders (e.g., cyclothymic disorder; and bipolar diseases). Bipolar Disorder.
  • Rapid-acting and provide antimanic effect (mood stabilizers have a latency period before they take effect)
• Treatment-resistant depression: adjuvant Adjuvant Substances that augment, stimulate, activate, potentiate, or modulate the immune response at either the cellular or humoral level. The classical agents (freund’s adjuvant, bcg, corynebacterium parvum, et al.) contain bacterial antigens. Some are endogenous (e.g., histamine, interferon, transfer factor, tuftsin, interleukin-1). Their mode of action is either non-specific, resulting in increased immune responsiveness to a wide variety of antigens, or antigen-specific, i.e., affecting a restricted type of immune response to a narrow group of antigens. The therapeutic efficacy of many biological response modifiers is related to their antigen-specific immunoadjuvanticity. Vaccination therapy in combination with an antidepressant Antidepressant Antidepressants encompass several drug classes and are used to treat individuals with depression, anxiety, and psychiatric conditions, as well as those with chronic pain and symptoms of menopause. Antidepressants include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and many other drugs in a class of their own. Serotonin Reuptake Inhibitors and Similar Antidepressants
• Delirium Delirium Delirium is a medical condition characterized by acute disturbances in attention and awareness. Symptoms may fluctuate during the course of a day and involve memory deficits and disorientation. Delirium: may be used cautiously in individuals with severe delirium Delirium Delirium is a medical condition characterized by acute disturbances in attention and awareness. Symptoms may fluctuate during the course of a day and involve memory deficits and disorientation. Delirium, who are aggressive, and who are a danger to themselves or others
• Dementia Dementia Major neurocognitive disorders (NCD), also known as dementia, are a group of diseases characterized by decline in a person’s memory and executive function. These disorders are progressive and persistent diseases that are the leading cause of disability among elderly people worldwide. Major Neurocognitive Disorders: 
  • Not approved for the treatment of behavioral disorders in individuals with dementia Dementia Major neurocognitive disorders (NCD), also known as dementia, are a group of diseases characterized by decline in a person’s memory and executive function. These disorders are progressive and persistent diseases that are the leading cause of disability among elderly people worldwide. Major Neurocognitive Disorders
  • Should not be used routinely to treat neuropsychiatric symptoms of dementia Dementia Major neurocognitive disorders (NCD), also known as dementia, are a group of diseases characterized by decline in a person’s memory and executive function. These disorders are progressive and persistent diseases that are the leading cause of disability among elderly people worldwide. Major Neurocognitive Disorders
  • Acute pharmacologic therapy with an antipsychotic Antipsychotic Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics drug may become necessary (use with caution) when other approaches fail to manage neuropsychiatric symptoms effectively and result in severe distress or safety issues.

Advantages of SGAs over FGAs FGAs Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics

• Tend to alleviate positive symptoms
• May lessen “negative” symptoms (blunted affect Affect The feeling-tone accompaniment of an idea or mental representation. It is the most direct psychic derivative of instinct and the psychic representative of the various bodily changes by means of which instincts manifest themselves. Psychiatric Assessment, anhedonia Anhedonia Inability to experience pleasure due to impairment or dysfunction of normal psychological and neurobiological mechanisms. It is a symptom of many psychotic disorders (e.g., depressive disorder, major; and schizophrenia). Schizophrenia, avolition Avolition Lack of initiative. Schizophrenia, social withdrawal) to a greater extent than FGAs FGAs Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics; however, this is controversial.
• May cause less cognitive blunting
• Clozapine is more efficacious in the treatment of resistant schizophrenia Schizophrenia Schizophrenia is a chronic mental health disorder characterized by the presence of psychotic symptoms such as delusions or hallucinations. The signs and symptoms of schizophrenia are traditionally separated into 2 groups: positive (delusions, hallucinations, and disorganized speech or behavior) and negative (flat affect, avolition, anhedonia, poor attention, and alogia). Schizophrenia.
• SGAs are less likely to have extrapyramidal side effects.
• Lower risk of tardive dyskinesia
• Hyperprolactinemia Hyperprolactinemia Hyperprolactinemia is defined as a condition of elevated levels of prolactin (PRL) hormone in the blood. The PRL hormone is secreted by the anterior pituitary gland and is responsible for breast development and lactation. The most common cause is PRL-secreting pituitary adenomas (prolactinomas). Hyperprolactinemia:
  • Seen with risperidone
  • Seen with several other SGAs, but rarely
  • Newer drugs are “prolactin-sparing” antipsychotics.
• Clinical efficacy of SGAs and FGAs FGAs Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics is generally comparable.

Adverse Effects, Contraindications, and Drug–Drug Interactions

Although extrapyramidal symptoms Extrapyramidal Symptoms Ataxia-telangiectasia (EPS) do occur with SGAs, the rates are lower than with FGAs FGAs Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics. However, SGAs have more metabolic side effects, including hyperglycemia Hyperglycemia Abnormally high blood glucose level. Diabetes Mellitus, hyperlipidemia, and weight gain. All have the serious potential adverse effects of neuroleptic malignant syndrome Neuroleptic malignant syndrome Neuroleptic malignant syndrome (NMS) is a rare, idiosyncratic, and potentially life-threatening reaction to antipsychotic drugs. Neuroleptic malignant syndrome presents with ≥ 2 of the following cardinal symptoms: fever, altered mental status, muscle rigidity, and autonomic dysfunction. Neuroleptic Malignant Syndrome, hyperthermia, and tardive dyskinesia.

Adverse effects

Serious adverse effects:

• QT prolongation:
  • Most common with ziprasidone and pimavanserin (but also asenapine, iloperidone, olanzapine, paliperidone, quetiapine, and risperidone)
  • Avoid use in individuals with known QT prolongation with other drugs known to prolong the QT interval QT interval Electrocardiogram (ECG) (antiarrhythmics and other antipsychotic Antipsychotic Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics medications).
• Hyperprolactinemia Hyperprolactinemia Hyperprolactinemia is defined as a condition of elevated levels of prolactin (PRL) hormone in the blood. The PRL hormone is secreted by the anterior pituitary gland and is responsible for breast development and lactation. The most common cause is PRL-secreting pituitary adenomas (prolactinomas). Hyperprolactinemia:
  • Depends on the D2 receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors occupancy and the antagonist properties of the drug
  • Occurs most often with paliperidone and risperidone and less often with lurasidone and ziprasidone
  • Aripiprazole, brexpiprazole, cariprazine, and quetiapine are “prolactin-sparing.”
• Neuroleptic malignant syndrome Neuroleptic malignant syndrome Neuroleptic malignant syndrome (NMS) is a rare, idiosyncratic, and potentially life-threatening reaction to antipsychotic drugs. Neuroleptic malignant syndrome presents with ≥ 2 of the following cardinal symptoms: fever, altered mental status, muscle rigidity, and autonomic dysfunction. Neuroleptic Malignant Syndrome ( NMS NMS Neuroleptic malignant syndrome (NMS) is a rare, idiosyncratic, and potentially life-threatening reaction to antipsychotic drugs. Neuroleptic malignant syndrome presents with ≥ 2 of the following cardinal symptoms: fever, altered mental status, muscle rigidity, and autonomic dysfunction. Neuroleptic Malignant Syndrome) is a medical emergency. 
  • Immediately stop the offending agent, unless NMS NMS Neuroleptic malignant syndrome (NMS) is a rare, idiosyncratic, and potentially life-threatening reaction to antipsychotic drugs. Neuroleptic malignant syndrome presents with ≥ 2 of the following cardinal symptoms: fever, altered mental status, muscle rigidity, and autonomic dysfunction. Neuroleptic Malignant Syndrome is provoked by antipsychotic Antipsychotic Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics withdrawal.
  • Give supportive care (fluids and cooling).
  • Drug treatment is monotherapy with IV dantrolene Dantrolene Skeletal muscle relaxant that acts by interfering with excitation-contraction coupling in the muscle fiber. It is used in spasticity and other neuromuscular abnormalities. Although the mechanism of action is probably not central, dantrolene is usually grouped with the central muscle relaxants. Spasmolytics and in combination with bromocriptine Bromocriptine A semisynthetic ergotamine alkaloid that is a dopamine D2 agonist. It suppresses prolactin secretion. Parkinson’s Disease Drugs (postsynaptic dopamine Dopamine One of the catecholamine neurotransmitters in the brain. It is derived from tyrosine and is the precursor to norepinephrine and epinephrine. Dopamine is a major transmitter in the extrapyramidal system of the brain, and important in regulating movement. Receptors and Neurotransmitters of the CNS D2 receptor Receptor Receptors are proteins located either on the surface of or within a cell that can bind to signaling molecules known as ligands (e.g., hormones) and cause some type of response within the cell. Receptors agonist).
• Increased risk of venous thromboembolism Venous thromboembolism Obstruction of a vein or veins (embolism) by a blood clot (thrombus) in the bloodstream. Hypercoagulable States:
  • Includes life-threatening pulmonary embolism Pulmonary Embolism Pulmonary embolism (PE) is a potentially fatal condition that occurs as a result of intraluminal obstruction of the main pulmonary artery or its branches. The causative factors include thrombi, air, amniotic fluid, and fat. In PE, gas exchange is impaired due to the decreased return of deoxygenated blood to the lungs. Pulmonary Embolism and stroke
  • Reported with clozapine, risperidone, and olanzapine
• Myocarditis Myocarditis Myocarditis is an inflammatory disease of the myocardium, which may occur alone or in association with a systemic process. There are numerous etiologies of myocarditis, but all lead to inflammation and myocyte injury, most often leading to signs and symptoms of heart failure. Myocarditis and cardiomyopathy Cardiomyopathy Cardiomyopathy refers to a group of myocardial diseases associated with structural changes of the heart muscles (myocardium) and impaired systolic and/or diastolic function in the absence of other heart disorders (coronary artery disease, hypertension, valvular disease, and congenital heart disease). Cardiomyopathy: Overview and Types: 
  • Reported with clozapine
  • Less likely with quetiapine, risperidone, and ziprasidone

Other frequent side effects:

• Sedation:
  • All SGAs (except pimavanserin) are H1-receptor antagonists → drowsiness
  • More severe at the onset of treatment; tolerance Tolerance Pharmacokinetics and Pharmacodynamics develops
• Extrapyramidal symptoms Extrapyramidal Symptoms Ataxia-telangiectasia:
  • Acute dystonias
  • Akathisia
  • Parkinsonism Parkinsonism West Nile Virus
  • Tardive dyskinesia
• Orthostatic hypotension Orthostatic hypotension A significant drop in blood pressure after assuming a standing position. Orthostatic hypotension is a finding, and defined as a 20-mm hg decrease in systolic pressure or a 10-mm hg decrease in diastolic pressure 3 minutes after the person has risen from supine to standing. Symptoms generally include dizziness, blurred vision, and syncope. Hypotension:
  • Occurs through alpha-adrenergic blockade
  • Most frequent with clozapine, iloperidone, quetiapine, and paliperidone
  • Less likely with olanzapine, risperidone, and ziprasidone
• Weight gain: most common with aripiprazole, olanzapine, paliperidone, quetiapine, and risperidone
• Metabolic syndrome Metabolic syndrome Metabolic syndrome is a cluster of conditions that significantly increases the risk for several secondary diseases, notably cardiovascular disease, type 2 diabetes, and nonalcoholic fatty liver. In general, it is agreed that hypertension, insulin resistance/hyperglycemia, and hyperlipidemia, along with central obesity, are components of the metabolic syndrome. Metabolic Syndrome: highest risk with clozapine and olanzapine
• Anticholinergic Anticholinergic Anticholinergic drugs block the effect of the neurotransmitter acetylcholine at the muscarinic receptors in the central and peripheral nervous systems. Anticholinergic agents inhibit the parasympathetic nervous system, resulting in effects on the smooth muscle in the respiratory tract, vascular system, urinary tract, GI tract, and pupils of the eyes. Anticholinergic Drugs effects:
  • Antimuscarinic activity is seen with some SGAs, or their active metabolites may cause anticholinergic Anticholinergic Anticholinergic drugs block the effect of the neurotransmitter acetylcholine at the muscarinic receptors in the central and peripheral nervous systems. Anticholinergic agents inhibit the parasympathetic nervous system, resulting in effects on the smooth muscle in the respiratory tract, vascular system, urinary tract, GI tract, and pupils of the eyes. Anticholinergic Drugs symptoms.
  • Effects include dry mouth, constipation Constipation Constipation is common and may be due to a variety of causes. Constipation is generally defined as bowel movement frequency < 3 times per week. Patients who are constipated often strain to pass hard stools. The condition is classified as primary (also known as idiopathic or functional constipation) or secondary, and as acute or chronic. Constipation, blurred vision Blurred Vision Retinal Detachment, and urinary retention Urinary retention Inability to empty the urinary bladder with voiding (urination). Delirium.
  • Most common with clozapine, olanzapine, and quetiapine
• Erectile dysfunction Erectile Dysfunction Erectile dysfunction (ED) is defined as the inability to achieve or maintain a penile erection, resulting in difficulty to perform penetrative sexual intercourse. Local penile factors and systemic diseases, including diabetes, cardiac disease, and neurological disorders, can cause ED. Erectile Dysfunction, priapism Priapism A prolonged painful erection that may lasts hours and is not associated with sexual activity. It is seen in patients with sickle cell anemia, advanced malignancy, spinal trauma; and certain drug treatments. Penile Anomalies and Conditions (rare, but reported with most atypical antipsychotics Atypical Antipsychotics Antiemetics)

Contraindications Contraindications A condition or factor associated with a recipient that makes the use of a drug, procedure, or physical agent improper or inadvisable. Contraindications may be absolute (life threatening) or relative (higher risk of complications in which benefits may outweigh risks). Noninvasive Ventilation/warnings

• Clozapine:
  • Avoid with breastfeeding Breastfeeding Breastfeeding is often the primary source of nutrition for the newborn. During pregnancy, hormonal stimulation causes the number and size of mammary glands in the breast to significantly increase. After delivery, prolactin stimulates milk production, while oxytocin stimulates milk expulsion through the lactiferous ducts, where it is sucked out through the nipple by the infant. Breastfeeding.
  • Required monitoring: CBC for absolute neutrophil count Absolute neutrophil count The number of neutrophils (as opposed to the percentage of WBCs) circulating per µL of blood . Neutropenia (ANC)
  • Myocarditis Myocarditis Myocarditis is an inflammatory disease of the myocardium, which may occur alone or in association with a systemic process. There are numerous etiologies of myocarditis, but all lead to inflammation and myocyte injury, most often leading to signs and symptoms of heart failure. Myocarditis and cardiomyopathy Cardiomyopathy Cardiomyopathy refers to a group of myocardial diseases associated with structural changes of the heart muscles (myocardium) and impaired systolic and/or diastolic function in the absence of other heart disorders (coronary artery disease, hypertension, valvular disease, and congenital heart disease). Cardiomyopathy: Overview and Types (↑ risk during the 1st 6 weeks of treatment) 
  • Seizures Seizures A seizure is abnormal electrical activity of the neurons in the cerebral cortex that can manifest in numerous ways depending on the region of the brain affected. Seizures consist of a sudden imbalance that occurs between the excitatory and inhibitory signals in cortical neurons, creating a net excitation. The 2 major classes of seizures are focal and generalized. Seizures (↑ risk)
  • Orthostatic hypotension Orthostatic hypotension A significant drop in blood pressure after assuming a standing position. Orthostatic hypotension is a finding, and defined as a 20-mm hg decrease in systolic pressure or a 10-mm hg decrease in diastolic pressure 3 minutes after the person has risen from supine to standing. Symptoms generally include dizziness, blurred vision, and syncope. Hypotension, bradycardia Bradycardia Bradyarrhythmia is a rhythm in which the heart rate is less than 60/min. Bradyarrhythmia can be physiologic, without symptoms or hemodynamic change. Pathologic bradyarrhythmia results in reduced cardiac output and hemodynamic instability causing syncope, dizziness, or dyspnea. Bradyarrhythmias, syncope Syncope Syncope is a short-term loss of consciousness and loss of postural stability followed by spontaneous return of consciousness to the previous neurologic baseline without the need for resuscitation. The condition is caused by transient interruption of cerebral blood flow that may be benign or related to a underlying life-threatening condition. Syncope, and cardiac arrest Cardiac arrest Cardiac arrest is the sudden, complete cessation of cardiac output with hemodynamic collapse. Patients present as pulseless, unresponsive, and apneic. Rhythms associated with cardiac arrest are ventricular fibrillation/tachycardia, asystole, or pulseless electrical activity. Cardiac Arrest (risk highest during initial dose titration)
  • Severe neutropenia Neutropenia Neutrophils are an important component of the immune system and play a significant role in the eradication of infections. Low numbers of circulating neutrophils, referred to as neutropenia, predispose the body to recurrent infections or sepsis, though patients can also be asymptomatic. Neutropenia leading to infection and death
• Olanzapine:
  • Avoid use in pregnant and breastfeeding Breastfeeding Breastfeeding is often the primary source of nutrition for the newborn. During pregnancy, hormonal stimulation causes the number and size of mammary glands in the breast to significantly increase. After delivery, prolactin stimulates milk production, while oxytocin stimulates milk expulsion through the lactiferous ducts, where it is sucked out through the nipple by the infant. Breastfeeding individuals.
  • Avoid concurrent use with a benzodiazepine owing to increased risk for respiratory depression.
  • Olanzapine long-acting injectable (LAI): postdose delirium Delirium Delirium is a medical condition characterized by acute disturbances in attention and awareness. Symptoms may fluctuate during the course of a day and involve memory deficits and disorientation. Delirium/sedation syndrome
• Quetiapine: 
  • ↑ Blood pressure in children/adolescents
  • Caution with:
    • Uncorrected electrolyte abnormalities
    • Congenital Congenital Chorioretinitis long-QT syndrome
    • Bradycardia Bradycardia Bradyarrhythmia is a rhythm in which the heart rate is less than 60/min. Bradyarrhythmia can be physiologic, without symptoms or hemodynamic change. Pathologic bradyarrhythmia results in reduced cardiac output and hemodynamic instability causing syncope, dizziness, or dyspnea. Bradyarrhythmias
    • Recent MI MI MI is ischemia and death of an area of myocardial tissue due to insufficient blood flow and oxygenation, usually from thrombus formation on a ruptured atherosclerotic plaque in the epicardial arteries. Clinical presentation is most commonly with chest pain, but women and patients with diabetes may have atypical symptoms. Myocardial Infarction or heart failure Heart Failure A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (ventricular dysfunction), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as myocardial infarction. Total Anomalous Pulmonary Venous Return (TAPVR)
• Black box warnings:
  • Elderly individuals with dementia-related psychosis treated with SGAs are at an increased risk of death (mostly from cardiovascular or infectious Infectious Febrile Infant causes):
    • SGAs are not approved for the treatment of individuals with dementia-related psychosis.
    • The extent to which increased mortality Mortality All deaths reported in a given population. Measures of Health Status is attributable to antipsychotic Antipsychotic Antipsychotics, also called neuroleptics, are used to treat psychotic disorders and alleviate agitation, mania, and aggression. Antipsychotics are notable for their use in treating schizophrenia and bipolar disorder and are divided into 1st-generation antipsychotics (FGAs) and atypical or 2nd-generation antipsychotics. First-Generation Antipsychotics medications is not clear.
  • Increased risk of suicidal thoughts and behavior in children and adolescents (< 24 years): 
    • Aripiprazole
    • Brexpiprazole
    • Cariprazine
    • Lurasidone
    • Quetiapine
  • Severe neutropenia Neutropenia Neutrophils are an important component of the immune system and play a significant role in the eradication of infections. Low numbers of circulating neutrophils, referred to as neutropenia, predispose the body to recurrent infections or sepsis, though patients can also be asymptomatic. Neutropenia/ agranulocytosis Agranulocytosis A decrease in the number of granulocytes; (basophils; eosinophils; and neutrophils). Lincosamides: 
    • May occur with clozapine ( incidence Incidence The number of new cases of a given disease during a given period in a specified population. It also is used for the rate at which new events occur in a defined population. It is differentiated from prevalence, which refers to all cases in the population at a given time. Measures of Disease Frequency, 3%–4%) and lead to serious infection and death ( incidence Incidence The number of new cases of a given disease during a given period in a specified population. It also is used for the rate at which new events occur in a defined population. It is differentiated from prevalence, which refers to all cases in the population at a given time. Measures of Disease Frequency, 1.3 in 10,000 (0.013%))
    • Obtain CBC and ANC at baseline, then regularly thereafter.
    • Requires regular Regular Insulin ongoing monitoring
    • Reported with risperidone and quetiapine also, especially with concomitant use of mood stabilizers

Drug–drug interactions

Aripiprazole and risperidone are primarily metabolized by CYP2D6 and CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers).

• Avoid concomitant use with other CYP2D6 and CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers) substrates, such as:
  • Benztropine Benztropine A centrally active muscarinic antagonist that has been used in the symptomatic treatment of parkinson disease. Benztropine also inhibits the uptake of dopamine. Anticholinergic Drugs
  • Carvedilol Carvedilol A carbazole and propanol derivative that acts as a non-cardioselective beta blocker and vasodilator. It has blocking activity for alpha 1 adrenergic receptors and, at higher doses, may function as a blocker of calcium channels; it also has antioxidant properties. Carvedilol is used in the treatment of hypertension; angina pectoris; and heart failure. It can also reduce the risk of death following myocardial infarction. Class 2 Antiarrhythmic Drugs (Beta Blockers)
  • Flecainide Flecainide A potent anti-arrhythmia agent, effective in a wide range of ventricular and atrial arrhythmias and tachycardias. Class 1 Antiarrhythmic Drugs (Sodium Channel Blockers)
  • Fluoxetine Fluoxetine The first highly specific serotonin uptake inhibitor. It is used as an antidepressant and often has a more acceptable side-effects profile than traditional antidepressants. Serotonin Reuptake Inhibitors and Similar Antidepressants
  • Hydrocodone Hydrocodone Narcotic analgesic related to codeine, but more potent and more addicting by weight. It is used also as cough suppressant. Neonatal Abstinence Syndrome/ oxycodone Oxycodone A semisynthetic derivative of codeine. Opioid Analgesics
  • Methadone Methadone A synthetic opioid that is used as the hydrochloride. It is an opioid analgesic that is primarily a mu-opioid agonist. Opioid Analgesics
  • Methamphetamine Methamphetamine A central nervous system stimulant and sympathomimetic with actions and uses similar to dextroamphetamine. The smokable form is a drug of abuse and is referred to as crank, crystal, crystal meth, ice, and speed. Stimulants
  • Metoprolol Metoprolol A selective adrenergic beta-1 blocking agent that is commonly used to treat angina pectoris; hypertension; and cardiac arrhythmias. Antiadrenergic Drugs/ propranolol Propranolol A widely used non-cardioselective beta-adrenergic antagonist. Propranolol has been used for myocardial infarction; arrhythmia; angina pectoris; hypertension; hyperthyroidism; migraine; pheochromocytoma; and anxiety but adverse effects instigate replacement by newer drugs. Antiadrenergic Drugs
  • Tricyclic antidepressants Tricyclic antidepressants Tricyclic antidepressants (TCAs) are a class of medications used in the management of mood disorders, primarily depression. These agents, named after their 3-ring chemical structure, act via reuptake inhibition of neurotransmitters (particularly norepinephrine and serotonin) in the brain. Tricyclic Antidepressants
  • Trazodone Trazodone A serotonin uptake inhibitor that is used as an antidepressant agent. It has been shown to be effective in patients with major depressive disorders and other subsets of depressive disorders. It is generally more useful in depressive disorders associated with insomnia and anxiety. Serotonin Reuptake Inhibitors and Similar Antidepressants
  • Venlafaxine Venlafaxine A cyclohexanol and phenylethylamine derivative that functions as a serotonin and noradrenaline reuptake inhibitor (SNRI) and is used as an antidepressant agent. Serotonin Reuptake Inhibitors and Similar Antidepressants
• Avoid use with strong CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers) inhibitors, such as:
  • Allopurinol Allopurinol A xanthine oxidase inhibitor that decreases uric acid production. It also acts as an antimetabolite on some simpler organisms. Gout Drugs
  • Amiodarone Amiodarone An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting potassium channels and voltage-gated sodium channels. There is a resulting decrease in heart rate and in vascular resistance. Pulmonary Fibrosis
  • Erythromycin Erythromycin A bacteriostatic antibiotic macrolide produced by streptomyces erythreus. Erythromycin a is considered its major active component. In sensitive organisms, it inhibits protein synthesis by binding to 50s ribosomal subunits. This binding process inhibits peptidyl transferase activity and interferes with translocation of amino acids during translation and assembly of proteins. Macrolides and Ketolides
  • Azithromycin Azithromycin A semi-synthetic macrolide antibiotic structurally related to erythromycin. It has been used in the treatment of Mycobacterium avium intracellulare infections, toxoplasmosis, and cryptosporidiosis. Macrolides and Ketolides
  • Cyclosporine Cyclosporine A cyclic undecapeptide from an extract of soil fungi. It is a powerful immunosupressant with a specific action on T-lymphocytes. It is used for the prophylaxis of graft rejection in organ and tissue transplantation. Immunosuppressants
  • Diltiazem Diltiazem A benzothiazepine derivative with vasodilating action due to its antagonism of the actions of calcium ion on membrane functions. Class 4 Antiarrhythmic Drugs (Calcium Channel Blockers)
  • Verapamil Verapamil A calcium channel blocker that is a class IV anti-arrhythmia agent. Pulmonary Hypertension Drugs
  • Fluconazole Fluconazole Triazole antifungal agent that is used to treat oropharyngeal candidiasis and cryptococcal meningitis in aids. Azoles
  • Selective serotonin reuptake inhibitors Serotonin Reuptake Inhibitors Antidepressants encompass several drug classes and are used to treat individuals with depression, anxiety, and psychiatric conditions, as well as those with chronic pain and symptoms of menopause. Antidepressants include selective serotonin reuptake inhibitors (SSRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and many other drugs in a class of their own. Serotonin Reuptake Inhibitors and Similar Antidepressants ( SSRIs SSRIs Serotonin Reuptake Inhibitors and Similar Antidepressants)
  • Isoniazid Isoniazid Antibacterial agent used primarily as a tuberculostatic. It remains the treatment of choice for tuberculosis. Antimycobacterial Drugs
  • Metronidazole Metronidazole A nitroimidazole used to treat amebiasis; vaginitis; trichomonas infections; giardiasis; anaerobic bacteria; and treponemal infections. Pyogenic Liver Abscess
  • Quinolone antibiotics
  • Omeprazole Omeprazole A 4-methoxy-3, 5-dimethylpyridyl, 5-methoxybenzimidazole derivative of timoprazole that is used in the therapy of stomach ulcers and zollinger-ellison syndrome. The drug inhibits an h(+)-k(+)-exchanging ATPase which is found in gastric parietal cells. Gastric Acid Drugs
  • Valproic acid Valproic acid A fatty acid with anticonvulsant and anti-manic properties that is used in the treatment of epilepsy and bipolar disorder. The mechanisms of its therapeutic actions are not well understood. It may act by increasing gamma-aminobutyric acid levels in the brain or by altering the properties of voltage-gated sodium channels. First-Generation Anticonvulsant Drugs
• Avoid use with strong CYP3A4 CYP3A4 Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers) inducers, such as:
  • Carbamazepine Carbamazepine A dibenzazepine that acts as a sodium channel blocker. It is used as an anticonvulsant for the treatment of grand mal and psychomotor or focal seizures. It may also be used in the management of bipolar disorder, and has analgesic properties. First-Generation Anticonvulsant Drugs/ oxcarbazepine Oxcarbazepine A carbamazepine derivative that acts as a voltage-gated sodium channel blocker. It is used for the treatment of partial seizures with or without secondary generalization. It is also an inducer of cytochrome p-450 cyp3a4. First-Generation Anticonvulsant Drugs
  • Glucocorticoids Glucocorticoids Glucocorticoids are a class within the corticosteroid family. Glucocorticoids are chemically and functionally similar to endogenous cortisol. There are a wide array of indications, which primarily benefit from the antiinflammatory and immunosuppressive effects of this class of drugs. Glucocorticoids
  • Phenytoin Phenytoin An anticonvulsant that is used to treat a wide variety of seizures. The mechanism of therapeutic action is not clear, although several cellular actions have been described including effects on ion channels, active transport, and general membrane stabilization. Phenytoin has been proposed for several other therapeutic uses, but its use has been limited by its many adverse effects and interactions with other drugs. First-Generation Anticonvulsant Drugs
  • Progesterone Progesterone The major progestational steroid that is secreted primarily by the corpus luteum and the placenta. Progesterone acts on the uterus, the mammary glands and the brain. It is required in embryo implantation; pregnancy maintenance, and the development of mammary tissue for milk production. Progesterone, converted from pregnenolone, also serves as an intermediate in the biosynthesis of gonadal steroid hormones and adrenal corticosteroids. Gonadal Hormones
• Avoid use with CYP2D6 inhibitors, such as:
  • Amiodarone Amiodarone An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting potassium channels and voltage-gated sodium channels. There is a resulting decrease in heart rate and in vascular resistance. Pulmonary Fibrosis
  • Bupropion Bupropion A propiophenone-derived antidepressant and antismoking agent that inhibits the uptake of dopamine. Other Antidepressants
  • SSRIs SSRIs Serotonin Reuptake Inhibitors and Similar Antidepressants
  • Duloxetine Duloxetine A thiophene derivative and selective neurotransmitter uptake inhibitor for serotonin and noradrenaline (SNRI). It is an antidepressant agent and anxiolytic, and is also used for the treatment of pain in patients with diabetes mellitus and fibromyalgia. Serotonin Reuptake Inhibitors and Similar Antidepressants
  • Ritonavir Ritonavir An HIV protease inhibitor that works by interfering with the reproductive cycle of HIV. It also inhibits cytochrome p-450 cyp3a. Anti-HIV Drugs

Asenapine and olanzapine are primarily metabolized by CYP1A2; avoid combining with CYP1A2 inhibitors. 

• Quinolone antibiotics (e.g., ciprofloxacin Ciprofloxacin A broad-spectrum antimicrobial carboxyfluoroquinoline. Fluoroquinolones)
• Amiodarone Amiodarone An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting potassium channels and voltage-gated sodium channels. There is a resulting decrease in heart rate and in vascular resistance. Pulmonary Fibrosis
• SSRIs SSRIs Serotonin Reuptake Inhibitors and Similar Antidepressants
• Chloroquine Chloroquine The prototypical antimalarial agent with a mechanism that is not well understood. It has also been used to treat rheumatoid arthritis, systemic lupus erythematosus, and in the systemic therapy of amebic liver abscesses. Antimalarial Drugs

Avoid SGAs in combination with other drugs that prolong the QT interval QT interval Electrocardiogram (ECG).

• Antimicrobials:
  • Quinolone antibiotics
  • Erythromycin Erythromycin A bacteriostatic antibiotic macrolide produced by streptomyces erythreus. Erythromycin a is considered its major active component. In sensitive organisms, it inhibits protein synthesis by binding to 50s ribosomal subunits. This binding process inhibits peptidyl transferase activity and interferes with translocation of amino acids during translation and assembly of proteins. Macrolides and Ketolides, clarithromycin Clarithromycin A semisynthetic macrolide antibiotic derived from erythromycin that is active against a variety of microorganisms. It can inhibit protein synthesis in bacteria by reversibly binding to the 50s ribosomal subunits. This inhibits the translocation of aminoacyl transfer-RNA and prevents peptide chain elongation. Macrolides and Ketolides, azithromycin Azithromycin A semi-synthetic macrolide antibiotic structurally related to erythromycin. It has been used in the treatment of Mycobacterium avium intracellulare infections, toxoplasmosis, and cryptosporidiosis. Macrolides and Ketolides
  • Ketoconazole Ketoconazole Broad spectrum antifungal agent used for long periods at high doses, especially in immunosuppressed patients. Azoles, itraconazole Itraconazole A triazole antifungal agent that inhibits cytochrome p-450-dependent enzymes required for ergosterol synthesis. Azoles
• Antiarrhythmics:
  • Amiodarone Amiodarone An antianginal and class III antiarrhythmic drug. It increases the duration of ventricular and atrial muscle action by inhibiting potassium channels and voltage-gated sodium channels. There is a resulting decrease in heart rate and in vascular resistance. Pulmonary Fibrosis
  • Sotalol Sotalol An adrenergic beta-antagonist that is used in the treatment of life-threatening arrhythmias. Class 3 Antiarrhythmic Drugs (Potassium Channel Blockers)
  • Procainamide Procainamide A class ia antiarrhythmic drug that is structurally-related to procaine. Class 1 Antiarrhythmic Drugs (Sodium Channel Blockers)
• Antidepressants:
  • Tricyclics
  • SSRIs SSRIs Serotonin Reuptake Inhibitors and Similar Antidepressants
• Others:
  • Ondansetron Ondansetron A competitive serotonin type 3 receptor antagonist. It is effective in the treatment of nausea and vomiting caused by cytotoxic chemotherapy drugs, including cisplatin, and has reported anxiolytic and neuroleptic properties. Antiemetics (antiemetic)
  • Sumatriptan Sumatriptan A serotonin agonist that acts selectively at 5ht1 receptors. It is used in the treatment of migraine disorders. Triptans and Ergot Alkaloids, zolmitriptan Zolmitriptan Triptans and Ergot Alkaloids ( migraine Migraine Migraine headache is a primary headache disorder and is among the most prevalent disorders in the world. Migraine is characterized by episodic, moderate to severe headaches that may be associated with increased sensitivity to light and sound, as well as nausea and/or vomiting. Migraine Headache medications)
  • Methadone Methadone A synthetic opioid that is used as the hydrochloride. It is an opioid analgesic that is primarily a mu-opioid agonist. Opioid Analgesics 

Comparison of Atypical Antipsychotic Medications