Comparative Pharmacology
Head-to-head clinical analysis: FAZACLO ODT versus GEODON.
Peer-Reviewed Evidence
Head-to-head clinical analysis: FAZACLO ODT versus GEODON.
FAZACLO ODT vs GEODON
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Clozapine is an atypical antipsychotic that antagonizes serotonin 5-HT2A and dopamine D2 receptors, with higher affinity for 5-HT2A. It also blocks muscarinic M1, histaminergic H1, and adrenergic α1 and α2 receptors.
Ziprasidone is an atypical antipsychotic with high affinity for dopamine D2 and serotonin 5-HT2A receptors; it also antagonizes 5-HT2C, 5-HT1D, alpha1-adrenergic, and histamine H1 receptors, and moderately inhibits serotonin and norepinephrine reuptake.
Clozapine (FAZACLO ODT) is an atypical antipsychotic. For schizophrenia, the typical starting dose is 12.5 mg orally once daily or twice daily, titrated by 25-50 mg/day to a target dose of 300-450 mg/day divided, up to a maximum of 900 mg/day. For treatment-resistant schizophrenia, the target dose is 300-450 mg/day, with doses above 500 mg/day requiring slower titration. The oral disintegrating tablet is taken sublingually or swallowed whole.
20 mg orally twice daily with food; may titrate to 40-80 mg orally twice daily; maximum 80 mg orally twice daily. For acute treatment, IM 10-20 mg as needed up to 40 mg/day.
None Documented
None Documented
Terminal elimination half-life: 14 hours (range 6-26 hours) at steady state; increases with dose/duration. Context: Twice-daily dosing achieves steady state in 5-7 days.
Terminal elimination half-life is approximately 7 hours (range 5-10 hours) for oral ziprasidone; after intramuscular administration, half-life is about 2-5 hours. This short half-life may require twice-daily dosing for oral therapy.
Renal: 50% as metabolites (30% conjugated, 20% desmethylclozapine), 30% as unchanged; Fecal: 30% (biliary/fecal elimination of metabolites).
Primarily hepatic metabolism via aldehyde oxidase and CYP3A4. Approximately 20% excreted renally as unchanged drug, with the remainder as metabolites (mostly fecal).
Category C
Category C
Atypical Antipsychotic
Atypical Antipsychotic