Drug interactions
Ibutilide + Mefloquine
Severity: Contraindicated
Ibutilide and Mefloquine: contraindicated 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
Ibutilide markedly prolongs the QT interval and carries a substantial risk of torsades de pointes. Mefloquine can add to repolarization delay, so the combination increases the risk of life-threatening arrhythmia.
What this interaction means in plain words
Ibutilide and Mefloquine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Ibutilide belongs to Cardiovascular; Mefloquine belongs to Anti Parasitic.
Why it happens
Additive QT prolongation, with ibutilide as a potent IKr blocker.
What to do
Do not combine. Select an alternative antimalarial, and if mefloquine was recently taken, consider its long half-life before giving ibutilide.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Mefloquine
- Arsenic trioxide + Mefloquine Contraindicated
- Dronedarone + Mefloquine Contraindicated
- Levoketoconazole + Mefloquine Contraindicated
- Mefloquine + Nilotinib Contraindicated
- Mefloquine + Pimozide Contraindicated
- Mefloquine + Quinidine Contraindicated
Other interactions of Ibutilide
- Amiodarone + Ibutilide Contraindicated
- Amisulpride + Ibutilide Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Clarithromycin + Ibutilide Contraindicated
- Desipramine + Ibutilide Contraindicated
- Dolasetron + Ibutilide Contraindicated
Frequently asked questions
Can I take Ibutilide with Mefloquine?
MediHelp rates the interaction as contraindicated. Ibutilide and Mefloquine are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Ibutilide markedly prolongs the QT interval and carries a substantial risk of torsades de pointes. Mefloquine can add to repolarization delay, so the combination increases the risk of life-threatening arrhythmia.
How serious is the interaction between Ibutilide and Mefloquine?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not combine. Select an alternative antimalarial, and if mefloquine was recently taken, consider its long half-life before giving ibutilide.
What other medicines interact with Mefloquine?
MediHelp also lists interactions of Mefloquine with, for example, Arsenic trioxide, Dronedarone, Levoketoconazole. The full list is on the Mefloquine page.
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