Comparative Pharmacology
Head-to-head clinical analysis: FANAPT versus INVEGA.
Peer-Reviewed Evidence
Head-to-head clinical analysis: FANAPT versus INVEGA.
FANAPT vs INVEGA
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
FANAPT (iloperidone) is an atypical antipsychotic that exhibits high affinity for serotonin 5-HT2A and dopamine D2 receptors, with additional antagonism at alpha1-adrenergic, alpha2-adrenergic, and histamine H1 receptors. The therapeutic efficacy is primarily attributed to combined 5-HT2A and D2 receptor antagonism.
Paliperidone is the major active metabolite of risperidone. It is a benzisoxazole derivative antipsychotic with high affinity for serotonin 5-HT2A and dopamine D2 receptors. It also acts as an antagonist at α1 and α2 adrenergic receptors and H1 histaminergic receptors. It has no affinity for muscarinic receptors.
12-24 mg orally once daily, titrated from 1 mg twice daily on day 1, 2 mg twice daily on day 2, 4 mg twice daily on day 3, 6 mg twice daily on day 4, 8 mg twice daily on day 5, then 10 mg twice daily on day 6 and 7, followed by 12 mg once daily on day 8. Maximum dose: 24 mg/day.
Oral: 6 mg once daily; may increase to 9 mg/day if needed. IM (extended-release): 234 mg on day 1, 156 mg on day 8, then 117 mg monthly; adjust within range 39-234 mg per month.
None Documented
None Documented
Terminal elimination half-life is approximately 26 hours (range 22-30 hours) for the sum of parent drug and active metabolites (P95, P88, and P86); steady-state achieved within 4-5 days.
Terminal elimination half-life is approximately 23-29 hours for oral administration (paliperidone extended-release). Once-daily dosing achieves steady-state within 4-5 days.
Renal (approximately 80% as metabolites, <1% as parent drug) and fecal (approximately 20% as metabolites).
Primarily renal: 59-80% of dose excreted unchanged in urine (as parent drug and metabolites). Fecal: ~20-30%. Biliary elimination is minimal.
Category C
Category C
Atypical Antipsychotic
Atypical Antipsychotic