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Birth Control Pills - Efficacy

Medically Reviewed by Dr. Ramya Ananthakrishnan, MD , Dr. Simi Paknikar on Jul 27, 2020


Efficacy of Birth Control Pills / Oral Contraceptive Pills

The combined or phasic pill is very efficient (92-99.7%) if taken within six days after periods or abortion.


If it is taken at any other time it requires a period of one month to become effective. Failure rate is very negligible in the order of, 0.05-0.08%. Its efficiency is reduced when it is not consumed on a regular basis or if taken in combination with other medications like certain antibiotics and drugs for seizures, migraine disorder, and anti-TB drugs. The herbal supplement, St. John's wort also interferes with the functioning of The Pill. The birth control pills do not protect a woman against sexually transmitted (STDs).

References:

  1. Birth Control Pill - (http://kidshealth.org/teen/sexual_health/contraception/contraception_birth.html)

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