Answer
Halofantrine must not be used during malaria prevention or treatment with mefloquine hydrochloride, or within 15 weeks after its last dose, because of the risk of potentially fatal QTc interval prolongation.
Sources for this answer
- Lariam 250 mg tablets / Mefloquine 250 mg tabletsNeon Healthcare Ltd · emc · SmPC §4.3 Contraindications · Version 5Document updated
Sources checked