Associate Clinical Professor, St. John's University College of Pharmacy and Health Sciences
314 Answers 5,651 Helpful Votes 22 Followers
Birth control pills are out of your system in a day or two after you stop taking them – which is why you need to take them every single day in order for them to be effective.
The injectable forms of birth control, such as Depo-Provera, are designed to provide contraception for three months. But it can take up to nine or 10 months to be completely dispelled. After three months since your last injection, this form of birth control can no longer be guaranteed as an effective contraceptive.
Important: The opinions expressed in WebMD User-generated content areas like communities, reviews, ratings, blogs, or WebMD Answers are solely those of the User, who may or may not have medical or scientific training. These opinions do not represent the opinions of WebMD. User-generated content areas are not reviewed by a WebMD physician or any member of the WebMD editorial staff for accuracy, balance, objectivity, or any other reason except for compliance with our Terms and Conditions. Some of these opinions may contain information about treatments or uses of drug products that have not been approved by the U.S. Food and Drug Administration. WebMD does not endorse any specific product, service, or treatment. Do not consider WebMD User-generated content as medical advice. Never delay or disregard seeking professional medical advice from your doctor or other qualified healthcare provider because of something you have read on WebMD. You should always speak with your doctor before you start, stop, or change any prescribed part of your care plan or treatment. WebMD understands that reading individual, real-life experiences can be a helpful resource, but it is never a substitute for professional medical advice, diagnosis, or treatment from a qualified health care provider. If you think you may have a medical emergency, call your doctor or dial 911 immediately.