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A member asked:

What medicines reduce effect of oral contraceptives?

A doctor has provided 1 answer
Dr. Adam Levy answered

Many: Several antibiotics and even some cold medicatins can potentially do this. Best advice...Use condoms too when on other medications, especially prescriptions usless your gyn evaluates them and gives the ok to use pills alone.

Dr Achong agreed

Answered 10/30/2012

5.5k views

Thank

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Currently taking ranitidine for inflamed esophagus, also on the oral contraceptive pill rigevidon. Will ranitidine reduce effectiveness of the pill?

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30y/o, not pregnant.Late menstruation for 3 cycles.(2 weeks late)blood work normal.Any drugs?Oral contraceptives or provera (medroxyprogesterone) 10mg to help induce period?

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