When Does Birth Control Pill Start Working for PCOS Patients? - Obstetrics and Gynecology

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When does premedication take effect?


Hello Doctor, I have polycystic ovary syndrome and my menstrual cycle does not occur naturally.
Previously, I took Diane for about two to three months to induce my period.
Now, due to contraceptive needs, I would like to follow your instructions to take the pills for 21 days and then stop for 7 days.
Since I did not start taking the first pill of the first pack during my menstrual period, I would like to ask when I can expect to have contraceptive effectiveness.
Thank you!

Niming, 20~29 year old female. Ask Date: 2015/12/31

Dr. Lin Wenbin reply Obstetrics and Gynecology


Please have a check-up at the hospital before deciding whether to change the prescription.

Reply Date: 2015/12/31

More Info


When it comes to using birth control pills for patients with Polycystic Ovary Syndrome (PCOS), understanding when the contraceptive effects begin is crucial, especially for those who have irregular menstrual cycles. In your case, since you have been prescribed a birth control pill (Diane, in this instance) to manage your PCOS symptoms and also to provide contraception, it’s important to follow the guidelines for optimal effectiveness.

Typically, birth control pills take about 7 days to become effective if you start taking them at a time other than the first day of your menstrual period. If you begin taking the pill during the first five days of your menstrual cycle, it provides immediate contraceptive protection. However, since you mentioned that you started the first pack on a day that was not the first day of your period, you will need to wait for a full week of consistent use before relying on the pill for contraception.

Here’s a breakdown of how it works:
1. Starting the Pill: If you start taking the pill on any day other than the first day of your period, you should use an additional form of contraception (like condoms) for the first 7 days of taking the pill. This is to ensure that the hormones in the pill have had enough time to suppress ovulation.

2. Regular Use: It’s crucial to take the pill at the same time every day to maintain consistent hormone levels in your body. This consistency helps to maximize the effectiveness of the pill and minimize the risk of breakthrough bleeding or ovulation.

3. After 7 Days: Once you have taken the pill for 7 consecutive days, it should provide effective contraception. You can then rely on it as your primary method of birth control.

4. Managing PCOS Symptoms: In addition to preventing pregnancy, birth control pills can help regulate your menstrual cycle, reduce acne, and manage other symptoms associated with PCOS. However, it’s important to have regular follow-ups with your healthcare provider to monitor your condition and adjust treatment as necessary.

5. Potential Side Effects: While birth control pills are generally safe, they can have side effects, including nausea, headaches, mood changes, and weight fluctuations. If you experience severe side effects or have concerns about how the pill is affecting your health, it’s important to discuss these with your doctor.

6. Long-term Considerations: If you are considering long-term management of PCOS, it may be beneficial to discuss other treatment options with your healthcare provider, including lifestyle changes such as diet and exercise, which can also play a significant role in managing symptoms.

In summary, for your birth control pill to be effective, you should use an additional contraceptive method for the first 7 days after starting the pill if you did not begin on the first day of your period. After that, you can rely on the pill for contraception. Always keep an open line of communication with your healthcare provider to ensure that your treatment plan is tailored to your specific needs and health status.

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