| Re: What Makes It LESS Effective??
Yes, antibiotics + St Johns Wort make it less effective and liver enzyme inducers such as some anticonvulsants,eg carbomazepine, oxcarbazepine, topiramate,phenytoin, phenobarbital. Antiretroviral HIV medication, nelfinavir, nevirapine,oxcarbazepine. TB medication, especially rifabutin and rifampicin. Also griseofulvin antifungal and modafinil central nervous system stimulant.
Quite a list. But your Dr should find out if you are taking any of these before
prescribing birth control.
Alcohol in itself would not make it less effective unless it caused diarrhoea or vomiting.
Personally I would steer clear of any herbal preparation that claims to affect female hormones, as these have not all been widely regulated in the UK and may have an interaction.
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