How to use birth control pills?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Birth control pills are a daily oral contraceptive used to prevent pregnancy. They work in two main ways: by suppressing ovulation (stopping the ovaries from releasing an egg) and by thickening cervical mucus to block sperm from reaching an egg. For maximum effectiveness—up to 99% with perfect use—the pill must be taken at the same time every day. Missing a dose or taking it inconsistently can significantly reduce its protection.

If you're experiencing side effects, unusual symptoms, or aren't sure whether the pill is right for you, don't guess—get clarity. A free, instant, online symptom check can help you understand what your body is telling you, identify possible causes, and guide your next steps with confidence. It takes just a few minutes and could save you time, worry, and unnecessary uncertainty.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if birth control pills cause symptoms Discover why your birth control feels off Find out if symptoms need care today See OTC options for pill side effects Find a doctor for birth control questions Understand home remedies for pill side effects Discover likely causes of pill-related symptoms

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Explanation

Birth control pills are a type of oral contraceptive used to prevent pregnancy. They work mainly by stopping the ovaries from releasing eggs, a process known as ovulation. Additionally, these pills make the mucus in the cervix thicker, which helps block sperm from reaching any eggs that may be released.

How to Use Birth Control Pills:

Daily Routine: Take one pill every day, ideally at the same time each day. This helps maintain the hormone levels necessary to prevent pregnancy.
Starting the Pill: Depending on the type of pill, you may start taking it on the first day of your period or the first Sunday after your period begins. Follow the specific instructions provided with your prescription.
Consistency is Key: It's important to take the pill consistently without missing doses. Missing pills can increase the risk of pregnancy.

Tips for Success:

Set Reminders: Use alarms or phone reminders to help remember to take your pill.
Know What to Do if You Miss a Pill: Instructions for missed pills can vary, so check the guidelines provided with your prescription or consult a healthcare provider.
Monitor Your Symptoms: If you experience unusual side effects or symptoms while taking birth control pills, use this free symptom checker to better understand what might be happening and whether you should seek medical advice.

By understanding and following these guidelines, birth control pills can be an effective way to prevent pregnancy.

(References)

Rosenberg MJ, Waugh MS, & Meehan TE. (1995). risk indicators for poor pill taking and discontinuation. Contraception, 7628201.
Frye CA. (2006). An overview of oral contraceptives: mechanism of action .... Neurology, 16567739.
Dragoman MV. (2014). The combined oral contraceptive pill. Best practice & research. Clinical obstetrics & gynaecology, 25028259.

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