Drug interactions
Haloperidol + Lorcaserin
Severity: Moderate
Haloperidol and Lorcaserin: 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
Lorcaserin is a serotonin 5-HT2C agonist and may inhibit CYP2D6, so haloperidol exposure could rise modestly. Combination with antipsychotics also carries a theoretical risk of serotonin syndrome or neuroleptic malignant syndrome.
What this interaction means in plain words
Haloperidol and Lorcaserin 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.
Why it happens
Weak CYP2D6 inhibition by lorcaserin plus additive serotonergic and dopaminergic effects.
What to do
Monitor for extrapyramidal symptoms, QT changes, and signs of serotonin toxicity such as agitation, tremor and hyperthermia. Reduce haloperidol dose if adverse effects emerge.
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 Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Frequently asked questions
Can I take Haloperidol with Lorcaserin?
MediHelp rates the interaction as moderate. Haloperidol and Lorcaserin 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. Lorcaserin is a serotonin 5-HT2C agonist and may inhibit CYP2D6, so haloperidol exposure could rise modestly. Combination with antipsychotics also carries a theoretical risk of serotonin syndrome or neuroleptic malignant syndrome.
How serious is the interaction between Haloperidol and Lorcaserin?
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 for extrapyramidal symptoms, QT changes, and signs of serotonin toxicity such as agitation, tremor and hyperthermia. Reduce haloperidol dose if adverse effects emerge.
What other medicines interact with Haloperidol?
MediHelp also lists interactions of Haloperidol with, for example, Dofetilide, Dronedarone, Ibutilide. The full list is on the Haloperidol page.
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