Drug interactions
Asenapine transdermal + Mefloquine
Severity: Major
Asenapine transdermal and Mefloquine: major interaction.
Last updated Sources: UK SmPC
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
Asenapine and mefloquine can each prolong the QT interval, so combined use may raise the risk of torsades de pointes. Risk is higher with electrolyte abnormalities or structural heart disease.
What this interaction means in plain words
Asenapine transdermal and Mefloquine 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 pharmacodynamic QT prolongation.
What to do
Avoid the combination if possible. Otherwise obtain a baseline ECG and monitor QTc and electrolytes.
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 Mefloquine
- Arsenic trioxide + Mefloquine Contraindicated
- Dronedarone + Mefloquine Contraindicated
- Ibutilide + Mefloquine Contraindicated
- Levoketoconazole + Mefloquine Contraindicated
- Mefloquine + Nilotinib Contraindicated
- Mefloquine + Pimozide Contraindicated
Frequently asked questions
Can I take Asenapine transdermal with Mefloquine?
MediHelp rates the interaction as major. Asenapine transdermal and Mefloquine 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. Asenapine and mefloquine can each prolong the QT interval, so combined use may raise the risk of torsades de pointes. Risk is higher with electrolyte abnormalities or structural heart disease.
How serious is the interaction between Asenapine transdermal and Mefloquine?
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 if possible. Otherwise obtain a baseline ECG and monitor QTc and electrolytes.
What other medicines interact with Mefloquine?
MediHelp also lists interactions of Mefloquine with, for example, Arsenic trioxide, Dronedarone, Ibutilide. The full list is on the Mefloquine page.
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