Adding carbamazepine to risperidone.
- Risperidone is principally metabolized by CYP2D6 to an active metabolite 9-OH-risperidone (paliperidone).
- Carbamazepine is principally metabolized by CYP3A4, and is a potent inducer of CYP1A2, CYP2C9, CYP3A4 and UDP-glucuronosyltransferases.
- This combination of drugs may have possible synergistic effects. However, the pharmacokinetic drug interactions will influence the plasma levels. Dose adaptation will be recommended for this combination.
- Coadministration with carbamazepine may decrease the plasma concentrations of risperidone and its pharmacologically active metabolite, 9-hydroxyrisperidone.
- Risperidone should be given at higher dosage to control psychotic symptoms. 
- Pharmacologic response and plasma risperidone levels should be monitored more closely whenever carbamazepine is added to or withdrawn from therapy.  
- KNMP; Informatorium Medicamentorum 2023; Monografie "risperidon" (Dutch)
Cite error: Invalid
<ref>tag; name "informatorium" defined multiple times with different content
- Woods SW; Chlorpromazine equivalent doses for the newer atypical antipsychotics J Clin Psychiatry 2003;64:663-667
- The Lundbeck Institute; Psychotropics; Terminal Plasma Half-lives
- WHO Collaborating Centre for Drug Statistics Methodology ATC=N03AF01
- Farmacotherapeutisch Kompas; Toxicologie (dutch)
- Farmacotherapeutisch Kompas - carbamazepine (dutch)
- Interactions between risperidone and carbamazepine on drugs.com
- Strack DK et al. Antipsychotic prescribing practices following withdrawal of concomitant carbamazepine. J Psychiatr Pract. 2009 Nov;15(6):442-8
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