Oral Contraceptives: When Do They Start Working?

Regarding oral contraceptives?

I started taking 20 micrograms of oral contraceptive pills on the third day of my period.
Will it be effective for contraception when my period ends if I have intercourse? Thank you.

Kǎi Tì, 20~29 year old female. Ask Date: 2016/04/25

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, you can start taking the contraceptive pill on the fifth day of your menstrual period.
It doesn't have to be taken at the exact same time; a general timeframe is sufficient.
As long as you take it consistently, it will be effective for contraception.
Wishing you good health!

Reply Date: 2016/04/25

More Info

When it comes to understanding oral contraceptives, particularly combination pills like the one you mentioned (20愛月定錠), it's important to know how and when they become effective in preventing pregnancy.
Typically, if you start taking combination oral contraceptives during the first five days of your menstrual cycle (which is considered Day 1 of your period), the pills are effective immediately. Since you mentioned starting the pill on the third day of your period, you are within that window, and you should have contraceptive protection by the time your period ends. This means that if you have intercourse after your period ends, you should be protected against pregnancy.

However, if you start taking the pill at any other time in your cycle, it usually takes about seven days for the contraceptive effects to kick in. During this initial week, it is recommended to use a backup method of contraception, such as condoms, to ensure you are fully protected.

It's also worth noting that the effectiveness of oral contraceptives can be influenced by various factors, including missed doses, certain medications, and gastrointestinal issues (like vomiting or diarrhea). Therefore, it's crucial to take the pill consistently at the same time every day to maintain its effectiveness.

In addition to preventing pregnancy, oral contraceptives can also provide other benefits, such as regulating menstrual cycles, reducing menstrual cramps, and managing symptoms of conditions like polycystic ovary syndrome (PCOS) or endometriosis. However, they may not be suitable for everyone, and it's essential to discuss your medical history and any concerns with your healthcare provider before starting any form of hormonal contraception.

If you have any further questions or concerns about your specific situation, it’s always best to consult with your healthcare provider for personalized advice. They can provide you with the most accurate information based on your health history and needs.

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