Comparative Pharmacology
Head-to-head clinical analysis: CLOZAPINE versus RISPERDAL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CLOZAPINE versus RISPERDAL.
CLOZAPINE vs RISPERDAL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Atypical antipsychotic; binds to dopamine D4, serotonin 5-HT2A, and adrenergic α2 receptors; weak D2 antagonist with rapid dissociation; also affects histaminergic and cholinergic receptors.
Risperidone is a benzisoxazole atypical antipsychotic that antagonizes dopamine D2 and serotonin 5-HT2A receptors. It also blocks alpha1-adrenergic, alpha2-adrenergic, and histamine H1 receptors.
Initial: 12.5 mg orally once or twice daily; titrate gradually by 25-50 mg/day to target dose 300-450 mg/day in divided doses; max 900 mg/day.
2-8 mg orally once daily or divided twice daily; maximum 16 mg/day
None Documented
None Documented
Terminal elimination half-life is 8 to 12 hours (steady-state), but can range from 4 to 66 hours; requires dose adjustment in renal/hepatic impairment.
Clinical Note
moderateClozapine + Norfloxacin
"Clozapine may increase the QTc-prolonging activities of Norfloxacin."
Clinical Note
moderateClozapine + Torasemide
"The risk or severity of adverse effects can be increased when Clozapine is combined with Torasemide."
Clinical Note
moderateClozapine + Etacrynic acid
"The risk or severity of adverse effects can be increased when Clozapine is combined with Etacrynic acid."
Clinical Note
moderateClozapine + Furosemide
20 hours (parent drug), 23 hours (active metabolite 9-hydroxyrisperidone). Steady state reached in 5-6 days. Extended in elderly and hepatic/renal impairment.
Approximately 50% of the dose is excreted in urine (30% as unchanged drug and metabolites) and 30% in feces via biliary elimination.
Renal: 70% (30% as unchanged drug, 40% as metabolites), Fecal/Biliary: 14%
Category A/B
Category C
Atypical Antipsychotic
Atypical Antipsychotic
"The risk or severity of adverse effects can be increased when Clozapine is combined with Furosemide."