Drug interactions
Lorcaserin + Methamphetamine
Severity: Major
Lorcaserin and Methamphetamine: 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
Both drugs raise serotonergic activity, so combining them may precipitate serotonin syndrome, with agitation, tremor, hyperthermia, autonomic instability and neuromuscular hyperactivity. Lorcaserin has been withdrawn from many markets, but the interaction remains relevant where it is still in use.
What this interaction means in plain words
Lorcaserin and Methamphetamine 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: methamphetamine promotes serotonin release and lorcaserin is a 5-HT2C agonist.
What to do
Avoid the combination and use an alternative weight-loss or stimulant strategy. If coadministered, monitor for signs of serotonin toxicity and stop one agent if they develop.
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 Methamphetamine
- Isocarboxazid + Methamphetamine Contraindicated
- Linezolid + Methamphetamine Contraindicated
- Methamphetamine + Phenelzine Contraindicated
- Methamphetamine + Procarbazine Contraindicated
- Methamphetamine + Rasagiline Contraindicated
- Methamphetamine + Safinamide Contraindicated
Frequently asked questions
Can I take Lorcaserin with Methamphetamine?
MediHelp rates the interaction as major. Lorcaserin and Methamphetamine 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 raise serotonergic activity, so combining them may precipitate serotonin syndrome, with agitation, tremor, hyperthermia, autonomic instability and neuromuscular hyperactivity. Lorcaserin has been withdrawn from many markets, but the interaction remains relevant where it is still in use.
How serious is the interaction between Lorcaserin and Methamphetamine?
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 and use an alternative weight-loss or stimulant strategy. If coadministered, monitor for signs of serotonin toxicity and stop one agent if they develop.
What other medicines interact with Methamphetamine?
MediHelp also lists interactions of Methamphetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Methamphetamine page.
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