Drug interactions
carbamazepine + metronidazole
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Overview
Metronidazole may increase carbamazepine concentrations with risk of CNS toxicity; carbamazepine induction may modestly reduce metronidazole exposure.
Mechanism of action
Metronidazole weak CYP3A4 inhibition may decrease carbamazepine metabolism; carbamazepine induces hepatic enzymes, potentially lowering metronidazole levels.
Clinical management
Prefer alternatives if feasible. If combined, monitor carbamazepine trough levels and CNS toxicity (ataxia, diplopia, dizziness); consider carbamazepine dose reduction. Monitor metronidazole clinical response.
Drug reference
Frequently asked questions
Can I take carbamazepine with metronidazole?
The interaction is rated: Moderate. Metronidazole may increase carbamazepine concentrations with risk of CNS toxicity; carbamazepine induction may modestly reduce metronidazole exposure.
How serious is the interaction between carbamazepine and metronidazole?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between carbamazepine and metronidazole managed?
Prefer alternatives if feasible. If combined, monitor carbamazepine trough levels and CNS toxicity (ataxia, diplopia, dizziness); consider carbamazepine dose reduction. Monitor metronidazole clinical response.
Why do carbamazepine and metronidazole interact?
Metronidazole weak CYP3A4 inhibition may decrease carbamazepine metabolism; carbamazepine induces hepatic enzymes, potentially lowering metronidazole levels.
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