Missed Birth Control Pills: What to Do and Potential Effects - Obstetrics and Gynecology

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Emergency contraceptive pill


Hello Dr.
Huang: I have been taking the pre-medication for six months.
This month (the eighth month), I forgot to buy it and today is the seventh day of my period.
I usually start taking the medication on the fifth day of my period.
Is it still effective if I take the next pack two days late? Will it cause irregular menstruation? Would you recommend skipping the medication for a month instead? Thank you.

Ann, 20~29 year old female. Ask Date: 2021/05/16

Dr. Huang Yiwen reply Obstetrics and Gynecology


Hello Miss Ann: It is recommended that you wait at least one month before taking it.
If you insist on taking it on the seventh day, it is advisable to combine it with other contraceptive methods, such as condoms.

Reply Date: 2021/05/16

More Info


When it comes to missed birth control pills, it's essential to understand the implications and the best course of action to take. Birth control pills, particularly combined oral contraceptives (COCs), are designed to be taken daily to maintain consistent hormone levels in the body, which effectively prevents ovulation and regulates menstrual cycles. Missing doses can disrupt this balance, leading to potential risks of unintended pregnancy and irregular menstrual cycles.

In your case, since you have been on birth control for about eight months and have missed the opportunity to start your new pack on time, there are a few considerations to keep in mind. If you typically start your new pack on the fifth day of your period and you are now on the seventh day, it is generally recommended to wait until your next period to begin taking the pills again. Starting the pills late can lead to irregular bleeding and may not provide effective contraception, especially if you have had unprotected intercourse during this time.

If you decide to start taking the pills again after missing two days, you should be aware that the effectiveness of the birth control may be compromised. The general guideline for missed pills is as follows:
1. If you miss one pill: Take it as soon as you remember. If you miss it by more than 24 hours, take the missed pill and continue with your pack as usual, but use backup contraception (like condoms) for the next seven days.

2. If you miss two or more pills: The recommendation is to take the most recent missed pill as soon as you remember, discard the others, and continue taking the remaining pills in the pack. However, you should use backup contraception for at least seven days.

Given that you are already on your seventh day of menstruation, starting the new pack now may not be effective in preventing pregnancy. It is also possible that your body may react to the sudden introduction of hormones after a break, leading to irregular bleeding or other side effects.

Regarding whether to stop taking the pills for a month, this decision should be based on your personal health goals and circumstances. If you are not planning to conceive and wish to maintain contraceptive protection, it may be better to resume taking the pills after your next period. However, if you are considering a break from hormonal contraception for any reason, consulting with your healthcare provider is advisable. They can provide personalized advice based on your health history and contraceptive needs.

In summary, missing birth control pills can lead to unintended consequences, including irregular cycles and increased risk of pregnancy. If you have missed doses, it is crucial to follow the guidelines for missed pills and consider using backup contraception. If you have further concerns or experience unusual symptoms, it is always best to consult with your healthcare provider for tailored advice.

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