Answer
Rifampicin can make systemic hormonal contraception less effective. Ask promptly about a reliable non-hormonal option and emergency contraception if relevant.
Sources for this answer
- Rifinah 300mg/150mg Tablets — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.