Answer
Wash the ointment off before sexual activity because it may weaken condoms and diaphragms. HPV can still pass through uncovered skin, and NHS advice is to avoid sex during genital-wart treatment.
Sources for this answer
- Catephen 10% Ointment — 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.