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Antipsychotic
Aka: Antipsychotic, Anti-Psychotic, Neuroleptic
See AlsoExtrapyramidal Side Effect Neuroleptic Malignant Syndrome
IndicationsPsychosis (e.g. Schizophrenia )
Efficacy: Newer low potency agentsAtypicals only slightly better than high potency agentsSimilar efficacy in control of Psychosis Slightly less Extrapyramidal Side Effect s (EPSE)Clozapine has much less EPSE, but has diabetes risk Higher weight, lipid and diabetes related conditions Compliance is similar for both types of agents Atypical Antipsychotics are much more expensive ReferencesBarry (2003) Am Fam Physician 68(5):943-4 Leucht (2003) Lancet 361:1581-9
Preparations: D2 Antipsychotic Agents - High PotencyGeneral: Extrapyramidal Side Effect s (EPSE) with all Haloperidol (Haldol ) or Haloperidol decanoateTypical dose: 10-15 mg/day Perphenazine (Trilafon)Well tolerated with similar efficacy to other agentsLieberman (2005) N Engl J Med 353:1209-23 Thiothixene HCl (Navane)Typical Dose: 10 mg three times daily Maximum Dose: 60 mg per day Fluphenazine HCl (Prolixin)Typical Dose: 2.5 mg orally twice daily starting to 10-20 mg/day Maximum Dose: 40 mg orally or 100 mg IM per day Trifluoperazine (Stelazine)
Preparations: D2 Antipsychotic Agents - Medium PotencyLoxapine (Loxitane) Molindone (Moban)
Preparations: D2 Antipsychotic Agents - Low PotencyStrong anticholinergic effects with both agents Chlorpromazine HCl (Thorazine) - not available in U.S.Anticholinergic Symptoms Alpha adrenergic blockade (Hypotension ) Sedation Dosing: 400 mg/day (maximum 1000 mg/day) Thioridazine HCl (Mellaril) - not available in U.S.Anticholinergic Symptoms Alpha adrenergic blockade (Hypotension ) Sedation Dosing: 200-300 mg/day (maximum 800 mg/day)
Preparations: Atypical Antipsychotics (Second Generation) - Serotonin -Dopamine AntagonistsDibenzodiazepine (Clozapine , Clozaril )Typical maintenance dose: 300-600 mg/day Oldest second generation Antipsychotic (introduced in 1989) Most adverse side effect profile of second generation agentsAgranulocytosis (unique to Clozapine and FDA limits prescribers due to this effect)Causes anticholinergic effects, Sedation , Postural Hypotension , Seizure s, weight gain and dyslipidemia Olanzapine (Zyprexa )Typical maintenance dose: 10-20 mg/day Quetiapine (Seroquel )Typical maintenance dose: 250-600 mg/day Risperidone (Risperdal )Typical maintenance dose: 3-6 mg/day Ziprasidone (Geodon ) 40-80 mg/dayTypical maintenance dose: 40-80 mg/day Aripiprazole (Abilify )Typical maintenance dose: 10-30 mg/day
Adverse effects: GeneralSee Extrapyramidal Side Effect (EPSE)Especially with high potency first generation agents and Risperidone (Risperdal ) Neuroleptic Malignant Syndrome Anticholinergic effectsEspecially with Low potency first generation agents and Clozapine (Clozaril ) Sedation Especially with Low potency first generation agents, Clozapine (Clozaril ), Olanzapine (Zyprexa ) and Quetiapine (Seroquel ) Hyperprolactinemia See Prolactin Especially with all first generation Antipsychotics and Risperidone (Risperdal ) Postural Hypotension Especially with low potency first generation Antipsychotics, Clozapine (Clozaril ), Quetiapine (Seroquel ), and Risperidone (Risperdal ) Seizure sEspecially with Clozapine (Clozaril ) Sexual DysfunctionEspecially with all first generation Antipsychotics and Risperidone (Risperdal ) Ventricular arrhythmia (including Cardiac Arrest )Antipsychotic agent relative risk: 3.2 Consider obtaining baseline EKG before starting therapy Consider electrolyte and Magnesium monitoring with high risk agents (e.g. Thioridazine) Avoid concurrent use of other medications prolonging QT Interval See Prolonged QT Interval due to Medication Drugs studied (from highest to lowest risk)Thioridazine (Mellaril) Ziprasidone (Geodon )Haloperidol (Haldol )Quetiapine (Seroquel )Risperidone (Risperdal )Clozapine (Clozaril )Olanzapine (Zyprexa ) ReferencesHennessy (2002) BMJ 325:1070-2 Titier (2005) Drug Saf 28: 35-51
Adverse Effects: Second generation agents (atypicals)Weight gainWeight gain with all second generation agents except Aripiprazole (Abilify ) and Ziprasidone (Geodon ) Also occurs with low potency first generation Antipsychotics (Chlorpromazine, Thioridazine) Adverse Lipid effectsSerum Triglyceride increase most with Clozapine (Clozaril ), Olanzapine (Zyprexa ), Quetiapine (Seroquel ) HDL Cholesterol decrease is variable DiabetesHighest risk with Clozapine (Clozaril ) and Olanzapine (Zyprexa ) Lowest risk with Ziprasidone (Geodon ) and Aripiprazole (Abilify )
MonitoringPrecautionsClozapine has unique monitoring parameters (prescription only allowed by U.S. centers following protocol)Risk of Agranulocytosis Monitoring includes Complete Blood Count (weekly for 6 months, bimonthly for 6 months, then monthly) Medical history and Family History (including cardiovascular risks and arrhythmias)Obtain history at baseline and readdress annually Extrapyramidal Side Effect s (EPSE) - all agentsScreen for Tardive Dyskinesia at each visit Screen for other EPSE symptoms Educate about Neuroleptic Malignant Syndrome Obesity Monitoring (all Antipsychotics)Calculate BMI baseline, monthly for 3 months and then every 3 months thereafter Measure Waist Circumference annually Blood Pressure Obtain baseline, every 3 months and then annually Diabetes Mellitus Screening (Newer, atypical agents)Fasting Serum Glucose , 3 months and then annually Consider Hemoglobin A1C at four months after starting agent Screen for polyuria and polydipsia at each visit Hyperlipidemia (Newer, atypical agents)Lipid profile baseline and at 3 monthsRepeat lipids every 6 months if abnormalMay decrease frequency to every 2-5 years if normal ReferencesMarder (2004) Am J Psychiatry 161: 1334-49
ReferencesGardner (2005) CMAJ 172(13): 1703-11 Geddes (2000) BMJ 321:1371-6 Glick (2001) Ann Intern Med 134: 47-60 Haddad (2007) CNS Drugs 21(11): 911-36 Lieberman (2005) N Engl J Med 353:1209-23 Muench (2010) Am Fam Physician 81(5): 617-22