A member asked:

What causes hormonal contraception to fail?

A doctor has provided 1 answer

Nothing is 100%: The most common cause of failed hormonal contraception is related to user-error: missed pills, patch, ring, shot, etc, but even if you use a method perfectly, failures can happen. Next to permanent sterilization, the most effective methods include iuds and implants--which are "forgettable"--and not as subject to user-error, making them easy and very effective to use.

Answered 12/13/2016

5.2k views

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Will I get irregular periods after using emergency hormonal contraception?

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