Drug interactions
Carbamazepine + Loxapine
Severity: Moderate
Carbamazepine and Loxapine: moderate interaction.
Last updated
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.
Summary
Carbamazepine is a CYP3A4 inducer and may lower loxapine concentrations, reducing antipsychotic effect. Case reports with other antipsychotic and carbamazepine combinations also describe additive neurotoxicity. Loxapine may lower seizure threshold, opposing the anticonvulsant.
What this interaction means in plain words
Carbamazepine and Loxapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Carbamazepine belongs to Central Nervous System; Loxapine belongs to Central Nervous System.
Why it happens
Carbamazepine induces hepatic metabolism of loxapine, and loxapine lowers the seizure threshold, giving pharmacodynamic antagonism.
What to do
Monitor psychiatric response and seizure control, and adjust loxapine dose if efficacy falls. Check carbamazepine levels and neurotoxicity signs if symptoms arise.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Other interactions of Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Loxapine?
MediHelp rates the interaction as moderate. Carbamazepine and Loxapine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Carbamazepine is a CYP3A4 inducer and may lower loxapine concentrations, reducing antipsychotic effect. Case reports with other antipsychotic and carbamazepine combinations also describe additive neurotoxicity. Loxapine may lower seizure threshold, opposing the anticonvulsant.
How serious is the interaction between Carbamazepine and Loxapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor psychiatric response and seizure control, and adjust loxapine dose if efficacy falls. Check carbamazepine levels and neurotoxicity signs if symptoms arise.
What other medicines interact with Loxapine?
MediHelp also lists interactions of Loxapine with, for example, Alfentanil, Alprazolam, Amisulpride. The full list is on the Loxapine page.
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