Interactions with other medicines
NHS ChoicesMedical Reference
The emergency contraceptive pill may interact with other medicines.
- the complementary medicine St John's Wort
- some medicines used to treat epilepsy
- some medicines used to treat HIV
- some medicines used to treat tuberculosis
- medication such as omeprazole to make your stomach less acidic
EllaOne cannot be used if you are already taking one of these medicines as it will not be effective. Levonelle may still be used, but the dose will need to be increased - your doctor or pharmacist will be able to advise on this.
It's worth remembering that an emergency IUD is more effective than the emergency contraceptive pill, and will not react with any other medication.
There should be no interaction between the emergency contraceptive pill and most antibiotics.
It is fine to take the emergency contraceptive pill if you are already taking a combined oral contraceptive pill or progestogen-only pill.
If you want to check that your medicines are safe to take with the emergency contraceptive pill, ask your GP or a pharmacist. You should also read the patient information leaflet that comes with your medicines.