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A member asked:

What would cause my birth control pill to fail and cause pregnancy if taken correctly?

A doctor has provided 1 answer
Dr. Cornelius Oleary answered

Specializes in Urgent Care

OCP efficacy: 21 year old lady concerned about the efficacy of the oral contraceptive pill. The pill is considered to be 99% effective, but there are certain conditions such as when a woman is taking anticonvulsant medication (tegretol and dilantin) , modafinil, certain antibiotics, obesity, and sometimes even alcohol can effect the efficacy of the pill.

Answered 6/16/2019

1.6k views

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