Birth Control Pills: Timing, Effects, and Concerns - Obstetrics and Gynecology

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Issues with contraceptive pill usage?


Hello Doctor: I had a consultation on September 22 due to bleeding from adenomyosis, and the doctor prescribed "Youru" for one month.
I took the last pill of Youru on October 16 and returned for a follow-up on October 17.
Due to a weight gain of 5 kg and edema from the medication, the doctor determined that this medication was not suitable for me, so he switched me to "Wenbunin 30 Winstop." The doctor mentioned that I can start taking "Wenbunin" on October 18 or 19.
Therefore, I would like to ask if I need to wait until the fifth day of my menstrual period to start the medication? Will my menstrual period come after I finish taking "Wenbunin"? If my menstrual period occurs during this time, should I continue taking it? Once I start taking it, will it provide contraceptive effects? Thank you for your assistance.

sunny, 40~49 year old female. Ask Date: 2023/10/18

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, generally, it is recommended to start taking it on the fifth day of your menstrual cycle.
Wishing you good health!

Reply Date: 2023/10/18

More Info


Understanding birth control pills, their timing, effects, and concerns is crucial for effective contraceptive management. In your case, you have been prescribed two different types of hormonal contraceptives due to specific health concerns, and it's important to clarify how to use them effectively.

Firstly, regarding the timing of starting the new medication, "Wenbunin 30 Winstop," you do not necessarily have to wait until the fifth day of your menstrual cycle to begin taking it. Many modern birth control pills can be started at any time during your cycle, but it is often recommended to start them during the first five days of your menstrual period to ensure immediate contraceptive protection. Since your doctor has indicated that you can start taking it on October 18 or 19, you should follow their advice.
When starting a new birth control pill, it is important to understand that it may take a few days for the contraceptive effects to become fully effective. Typically, if you start the pill during the first five days of your cycle, you are protected from pregnancy immediately. However, if you start it at another time, it is generally advised to use a backup method of contraception, such as condoms, for the first seven days of taking the pill to ensure you are adequately protected.

As for your menstrual cycle, it is common for hormonal contraceptives to alter the timing and nature of your periods. When you take "Wenbunin," you may experience changes in your menstrual cycle, including lighter periods or even missed periods. Your period may come after you finish the pack of pills, but this can vary from person to person. If you experience bleeding while taking the pills, it is usually considered breakthrough bleeding and is not uncommon, especially when starting a new contraceptive.

Weight gain and water retention are known side effects of hormonal contraceptives, which you have already experienced with "You Ru." If you find that "Wenbunin" also causes similar side effects, it is important to discuss this with your healthcare provider. They may consider adjusting your prescription or exploring alternative contraceptive methods that may be more suitable for you.

In summary, you can start taking "Wenbunin" as directed by your doctor without waiting for a specific day in your cycle. Monitor your body’s response to the new medication, and do not hesitate to reach out to your healthcare provider if you have concerns about side effects or if your menstrual cycle does not return to what you expect. Remember, effective communication with your healthcare provider is key to managing your reproductive health and ensuring that you find a contraceptive method that works best for you.

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