EllaOne can make hormonal contraceptives, such as pills or patches, less effective. After taking EllaOne you should continue to use your regular hormonal contraceptive and also use condoms until your next period.
The following medicines may make EllaOne work less well:
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Phenytoin, fosphenytoine, phenobarbital, primidone, carbamazepine, oxcarbazepine (used to treat epilepsy)
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Ritonavir, efavirenz, nevirapine (used to treat HIV infection)
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Rifampicin, rifabutin (used to treat tuberculosis)
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St John's wort (Hypericum perforatum) or herbal medicines that contain it (used for depression or anxiety).
If you are taking any of the above medicines you should discuss emergency contraception with your GP to ensure that it is effective.
Please read the Patient Information Leaflet enclosed with your medicines for a full list of medicines that may affect EllaOne.
Do not take EllaOne if your period is already overdue as you may already be pregnant. You should see your GP or family planning clinic.
EllaOne should not replace your regular methods of contraception, such as the pill or condoms; these are more reliable and effective.