Drug interactions
Lithium + Lorcaserin
Severity: Major
Lithium and Lorcaserin: major 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
Both drugs enhance serotonergic activity, and combining them may raise the risk of serotonin syndrome, with agitation, tremor, hyperthermia, clonus and autonomic instability. Lithium also has its own serotonergic effects that can add to those of lorcaserin.
What this interaction means in plain words
Lithium 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 effects: lorcaserin is a 5-HT2C agonist and lithium enhances serotonin neurotransmission.
What to do
Avoid the combination where possible; lorcaserin has been withdrawn from many markets. If used together, monitor for serotonin toxicity signs, especially after dose changes.
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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Other interactions of Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
Frequently asked questions
Can I take Lithium with Lorcaserin?
MediHelp rates the interaction as major. Lithium 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. Both drugs enhance serotonergic activity, and combining them may raise the risk of serotonin syndrome, with agitation, tremor, hyperthermia, clonus and autonomic instability. Lithium also has its own serotonergic effects that can add to those of lorcaserin.
How serious is the interaction between Lithium 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 where possible; lorcaserin has been withdrawn from many markets. If used together, monitor for serotonin toxicity signs, especially after dose changes.
What other medicines interact with Lithium?
MediHelp also lists interactions of Lithium with, for example, Thioridazine, Vandetanib, Aceclofenac. The full list is on the Lithium page.
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