Birth Control Pills: Missed Doses and Effectiveness Concerns - Obstetrics and Gynecology

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Regarding the use of contraceptive pills?


Hello, I started taking birth control pills on March 21 (the second day of my period).
I forgot to take a pill on March 23, but I took it the next day on March 24.
I continued to take the pills on time after that.
However, on the evening of April 2, after taking my pill at 8 PM, I had diarrhea around 10 PM.
Should I have taken an additional pill? I did not take one, and the next day (April 3), I took my pill at the usual time, but I had unprotected intercourse that evening.
Is there a possibility of pregnancy? The birth control pill I am taking is Novynette, which was recommended by the pharmacy, but I don't see much discussion about this brand online.
Is it effective for contraception?

Cindy, 20~29 year old female. Ask Date: 2014/04/06

Dr. Lin Wenbin reply Obstetrics and Gynecology


Taking birth control pills regularly does not guarantee 100% contraception.
It is advisable to also use condoms, which can help prevent candidiasis infections.
Birth control pills must be prescribed by a physician, who will evaluate your health condition during the consultation before prescribing the medication.
This ensures that you are covered under medication injury relief.
Purchasing and taking the medication on your own may not be ineffective, but if complications arise, it may not qualify for medication injury relief, leaving you without protection.

Reply Date: 2014/04/06

More Info


When it comes to understanding birth control pills, particularly regarding missed doses and concerns about effectiveness, it's essential to grasp how these medications work and what to do in specific situations.
Birth control pills, like Novynette, are designed to prevent ovulation and create an environment in the uterus that is not conducive to fertilization. They are most effective when taken consistently at the same time every day. However, missed doses can compromise their effectiveness, leading to concerns about unintended pregnancy.

In your case, you started taking the pill on March 21, and although you missed a dose on March 23, you took it the next day. This is a good practice, as taking a missed pill as soon as you remember can help maintain the pill's effectiveness. However, the effectiveness of the pill can be affected by gastrointestinal issues, such as diarrhea, which you experienced on April 2. If diarrhea occurs within a few hours of taking the pill, it can prevent the body from absorbing the medication properly, potentially leading to reduced effectiveness.

Since you mentioned that you did not take an additional pill after experiencing diarrhea, this could be a concern. The general recommendation is that if you experience vomiting or diarrhea within 3-4 hours after taking a pill, you should take another pill as soon as possible. If you miss a pill and have unprotected sex, there is a possibility of pregnancy, especially if you had not taken the pill consistently leading up to that point.

On April 3, you continued to take your pill at the usual time but had unprotected sex that evening. Given the missed dose and the gastrointestinal upset, there is a risk of pregnancy, as the pill may not have been fully effective during that cycle. If you are concerned about the possibility of pregnancy, you might consider taking a home pregnancy test if your period is late or consult with your healthcare provider for further guidance.

Regarding the specific brand of the pill you are using, Novynette is a combined oral contraceptive pill, and while it may not be as widely discussed online, it is still a legitimate option for birth control. The effectiveness of any birth control pill, including Novynette, is contingent upon proper usage. When taken correctly, combined oral contraceptives have a failure rate of less than 1% with perfect use, but this rate increases with typical use, which accounts for missed doses and inconsistent timing.

In summary, if you miss a pill, take it as soon as you remember, and if you experience gastrointestinal issues shortly after taking a pill, consider taking an additional dose. If you have unprotected sex after a missed dose or during a time when the pill's effectiveness may be compromised, there is a risk of pregnancy. If you have concerns about your birth control method or potential pregnancy, it's best to consult with your healthcare provider for personalized advice and options.

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