Drug interactions
Lorcaserin + Risperidone
Severity: Moderate
Lorcaserin and Risperidone: 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 that inhibits CYP2D6 weakly, which may raise risperidone exposure. Combining serotonergic and dopamine-blocking agents also raises theoretical concern for serotonin syndrome or neuroleptic malignant syndrome. Lorcaserin has been withdrawn from the US market.
What this interaction means in plain words
Lorcaserin and Risperidone 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
CYP2D6 inhibition by lorcaserin may increase risperidone levels, plus possible additive serotonergic and antidopaminergic effects.
What to do
Monitor for extrapyramidal symptoms, sedation and signs of serotonin toxicity such as agitation, tremor, hyperthermia and clonus. Reduce the risperidone 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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Lorcaserin and Risperidone, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Risperidone
- Ibutilide + Risperidone Contraindicated
- Risperidone + Vandetanib Contraindicated
- Adagrasib + Risperidone Major
- Amiodarone + Risperidone Major
- Amisulpride + Risperidone Major
- Amoxapine + Risperidone Major
Frequently asked questions
Can I take Lorcaserin with Risperidone?
MediHelp rates the interaction as moderate. Lorcaserin and Risperidone 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 that inhibits CYP2D6 weakly, which may raise risperidone exposure. Combining serotonergic and dopamine-blocking agents also raises theoretical concern for serotonin syndrome or neuroleptic malignant syndrome. Lorcaserin has been withdrawn from the US market.
How serious is the interaction between Lorcaserin and Risperidone?
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, sedation and signs of serotonin toxicity such as agitation, tremor, hyperthermia and clonus. Reduce the risperidone dose if adverse effects emerge.
What other medicines interact with Risperidone?
MediHelp also lists interactions of Risperidone with, for example, Ibutilide, Vandetanib, Adagrasib. The full list is on the Risperidone page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
