Answer
St John’s wort can increase hormone metabolism and reduce contraceptive protection. Check herbal and non-prescription products with a pharmacist.
Sources for this answer
- Zelleta and Desogestrel 75 micrograms 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.