Drilldown: Medicines

Clozapine (1)

Clozaril (Novartis, original brand; 25 mg and 100 mg tablets); FazaClo (orally disintegrating tablets, 12.5/25/100/150/200 mg); Versacloz (oral suspension 50 mg/mL); multiple generics. All clozapine products are subject to the same REMS monitoring requirements. (1)

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'"`UNIQ--vote-00000049-QINU`"' (1)

None (1)

12.5 mg PO once or twice daily. Titrate gradually: 25-50 mg/day increments every 1-2 days as tolerated. Target dose 300-450 mg/day in divided doses (BID or TID). Most patients stabilize between 200-600 mg/day. Therapeutic plasma level guide: target trough clozapine ≥350 ng/mL. (1)

Clozaril 25 mg and 100 mg tablets; FazaClo orally disintegrating tablets (12.5/25/100/150/200 mg); Versacloz oral suspension 50 mg/mL. All brands subject to identical REMS ANC monitoring requirements. Generic tablets widely available. (1)

900 mg/day (split into BID or TID dosing). Clinical practice rarely exceeds 600 mg/day; seizure risk increases substantially above 600 mg/day and requires consideration of prophylactic anticonvulsant.'"`UNIQ--ref-0000004A-QINU`"' (1)

Oral only. No parenteral formulation (a major limitation in acute agitation requiring rapid tranquilization). (1)

Oral peak plasma 2.5 hours. Clinical antipsychotic response typically emerges over weeks with continued titration; full response assessment requires 3-6 months at adequate therapeutic levels. (1)

Due to the half-life of 12 hours (wide range), dosing is BID or TID. Once-daily dosing produces higher peak/trough fluctuations and is generally not used except for a single end-of-day dose in stable patients. (1)

None · ~12 hours · ~27 days · ~5 h (caffeine) · '''Autoinduction''': 25-65 hours initially, falling to 12-17 hours after 2-3 weeks of dosing as carbamazepine induces its own CYP3A4 metabolism. Major clinical implication: doses require re-titration after the autoinduction period'"`UNIQ--ref-0000001D-QINU`"' · 0.5-1.5 hours (plasma); pharmacodynamic effect persists 24+ hours'"`UNIQ--ref-000000DE-QINU`"' · 1-1.3 hours'"`UNIQ--ref-000001A1-QINU`"' · 1-1.5 hours'"`UNIQ--ref-00000DE3-QINU`"' · 1-2 hours (parent compound)'"`UNIQ--ref-00000029-QINU`"' · 1-2 hours (parent); 18-30 hours for active metabolite oxypurinol'"`UNIQ--ref-0000030F-QINU`"' · 1-2 hours'"`UNIQ--ref-00000017-QINU`"' · 1-3 days acute, 4-6 days chronic; 4-16 days for norfluoxetine'"`UNIQ--ref-0000004C-QINU`"' · 1-3 hours (normal liver); markedly prolonged in overdose with glutathione depletion'"`UNIQ--ref-000006A5-QINU`"' · 1-3 minutes (very short)'"`UNIQ--ref-00000C0F-QINU`"' · 1.4 hours (parent); 13-24 hours for active metabolite canrenone'"`UNIQ--ref-00000354-QINU`"' · 1.5-2 hours (longer in renal failure)'"`UNIQ--ref-00000222-QINU`"' · 1.5-2 hours'"`UNIQ--ref-00000020-QINU`"' · 10-11 hours (benazeprilat, the active metabolite)'"`UNIQ--ref-00000A22-QINU`"' · 11-13 h (immediate-release); 11-16 h (extended-release) · 11-15 hours'"`UNIQ--ref-00000842-QINU`"'

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Approximately 50-60% (oral; subject to first-pass metabolism); food does not significantly affect absorption.'"`UNIQ--ref-0000004C-QINU`"' (1)

None (1)

None (1)