Drug interactions
Duloxetine + Lorcaserin
Severity: Major
Duloxetine and Lorcaserin: major interaction.
Last updated Sources: US FDA label
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 combining it with duloxetine raises the risk of serotonin syndrome. Sedation is a less prominent concern than serotonergic toxicity. Lorcaserin has been withdrawn from the US market, so the combination is now uncommon.
What this interaction means in plain words
Duloxetine and Lorcaserin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive serotonergic activity from 5-HT2C agonism together with serotonin reuptake inhibition.
What to do
Avoid the combination or use only with close monitoring for serotonin syndrome features such as clonus, agitation, fever and diarrhea. Choose an alternative weight-management agent if possible.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Duloxetine
- Duloxetine + Isocarboxazid Contraindicated
- Duloxetine + Linezolid Contraindicated
- Duloxetine + Methylene blue Contraindicated
- Duloxetine + Phenelzine Contraindicated
- Duloxetine + Procarbazine Contraindicated
- Duloxetine + Rasagiline Contraindicated
Frequently asked questions
Can I take Duloxetine with Lorcaserin?
MediHelp rates the interaction as major. Duloxetine and Lorcaserin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Lorcaserin is a serotonin 5-HT2C agonist, and combining it with duloxetine raises the risk of serotonin syndrome. Sedation is a less prominent concern than serotonergic toxicity. Lorcaserin has been withdrawn from the US market, so the combination is now uncommon.
How serious is the interaction between Duloxetine and Lorcaserin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination or use only with close monitoring for serotonin syndrome features such as clonus, agitation, fever and diarrhea. Choose an alternative weight-management agent if possible.
What other medicines interact with Duloxetine?
MediHelp also lists interactions of Duloxetine with, for example, Isocarboxazid, Linezolid, Methylene blue. The full list is on the Duloxetine page.
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