How Long Should You Take Yuezhi for Effective Results? - Obstetrics and Gynecology

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How long does it take for Yuezhi to be effective?


Hello Dr.
Tsao! Thank you for taking the time to respond to my questions.
Currently, I am taking Yaz (started on May 7).
How many days do I need to take it before I can have unprotected sex? I've heard some people say that after 7 days it's okay, while others say I need to finish a full pack (28 days) first.
Can I have unprotected sex after taking it until May 14 (the eighth day)? Thank you for your response, doctor!

Ning, 10~19 year old female. Ask Date: 2024/05/12

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, if you start taking birth control pills on the fifth day of your menstrual period, you will have contraceptive protection at any time.
Wishing you good health!

Reply Date: 2024/05/12

More Info


When it comes to taking Yuezhi (also known as a contraceptive pill), the effectiveness and the timeline for achieving reliable contraception can vary based on several factors, including the specific formulation of the pill and individual health considerations. Generally, most combined oral contraceptives, including Yuezhi, require a consistent intake for a certain period before they can be considered effective in preventing pregnancy.

Typically, it is recommended that you take the pill for at least 7 consecutive days before relying on it for contraception. This means that if you start taking Yuezhi on the first day of your menstrual cycle, you should use an additional form of contraception, such as condoms, for the first week. After 7 days of consistent use, the pill should provide effective contraception.

However, if you start taking the pill at a different time in your cycle, or if you miss a dose, the timeline may change. For example, if you start taking Yuezhi after the first day of your period, it may take longer to become effective, and you should consult with your healthcare provider for personalized advice.

Regarding your question about whether you can have unprotected intercourse after 8 days of taking Yuezhi, it is generally advisable to wait until you have taken the pill for a full 7 days consistently. Therefore, by the 8th day, you should be protected, provided you have taken the pill as directed without missing any doses.

It's also important to consider that while Yuezhi is effective in preventing pregnancy, it does not protect against sexually transmitted infections (STIs). Therefore, if you are not in a mutually monogamous relationship or if you are unsure of your partner's STI status, using condoms is still recommended.

In terms of long-term use, Yuezhi and other oral contraceptives can be taken for extended periods, often for years, as long as there are no contraindications or adverse effects. Regular check-ups with your healthcare provider are essential to monitor your health and discuss any concerns regarding the use of contraceptives.

In summary, you should take Yuezhi for at least 7 consecutive days before relying on it for contraception. After 8 days of consistent use, you should be protected against pregnancy. Always consult with your healthcare provider for personalized advice and to ensure that you are using the medication correctly and safely.

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Dr. Lü Lizheng reply Obstetrics and Gynecology
Start taking it on the fifth day of your menstrual period to reduce irregular bleeding. If taken consistently, it will provide contraceptive effects from the start. The longer you take it, the better the effectiveness. Sincerely, Dr. Li-Cheng Lu, Taoyuan Hospital.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, do not take additional pills. Birth control pills are generally started on the fifth day of your menstrual period. Wishing you good health.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, taking birth control pills on time will provide contraceptive effectiveness. Any discomfort you feel is a side effect, and you can simply monitor it. Wishing you good health.

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Dr. Lü Lizheng reply Obstetrics and Gynecology
Hello: Yuezhi is classified as an ultra-low-dose contraceptive pill. It is important to develop a habit of taking the medication regularly, as it provides effective contraception. Initially, some individuals may experience side effects such as breast tenderness, nausea, dizziness...

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