Answer
Riamet (artemether + lumefantrine) may reduce hormonal contraceptive effectiveness, so patients using oral, transdermal patch or other systemic hormonal contraceptives should use an additional nonhormonal birth-control method for about one month.
Sources for this answer
- Riamet 20/120mg tabletsNovartis Pharmaceuticals UK Ltd · emc · SmPC §4.5 Interaction with other medicinal products · Version 30Document updated
Sources checked