Birth Control Pill Timing: Common Myths and Facts - Obstetrics and Gynecology

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Inquiry about the method of taking contraceptive pills?


Hello Dr.
Lin, about 1-2 months ago, I consulted you online regarding oral contraceptives, and your response was very helpful.
However, I have encountered another issue and would like to ask for your assistance again.
I have heard from friends and others that the first pill of each cycle should be taken on the 5th day of menstruation, and many people online say that if you take it after the 7th day of your menstrual cycle, its effectiveness will be significantly reduced.
Is this true? However, many contraceptives, such as Marvelon and Qlaira, state in their instructions that you should take them for 21 days and then stop for 7 days (I am taking Marvelon).
For example, I finished taking the 21st pill on the 5th, and my period started on the 6th.
According to the instructions, I should stop from the 6th to the 12th for 7 days and then continue taking the next cycle on the 13th.
But if I follow what is said online, taking it after the 7th day of my menstrual cycle (the 13th would be the 8th day) would significantly reduce its effectiveness.
Is this correct or incorrect? Is it really necessary to take the pill on the 5th day of each cycle? Or should I strictly follow the instructions to take for 21 days and then stop for 7 days, regardless of whether my period has ended or not, and as soon as the 7-day break is over, immediately start the next cycle? I apologize for bothering you, and I appreciate your clarification.

Xiao Lian, 20~29 year old female. Ask Date: 2007/03/13

Dr. Lin Zhaopei reply Obstetrics and Gynecology


1.
Delayed administration may adversely affect ovulation suppression.
2.
If there is a conflict between stopping the medication for 7 days and taking the medication on the fifth day of menstruation, priority should be given to taking the medication on the fifth day of menstruation.

Reply Date: 2007/03/13

More Info


When it comes to understanding the timing and effectiveness of birth control pills, there are several myths and facts that need to be clarified. The concerns you have about when to start taking your birth control pills, particularly regarding the timing in relation to your menstrual cycle, are common among many users.

First and foremost, it is essential to follow the instructions provided with your specific birth control pill, such as Marvelow. Most combination oral contraceptives, including Marvelow, are designed to be taken for 21 consecutive days, followed by a 7-day break during which you typically experience a withdrawal bleed, similar to a period. This regimen is based on the hormonal cycle that the pill is designed to mimic and is effective in preventing ovulation when taken correctly.

Now, regarding the timing of when to start taking the pill: it is a common misconception that you must start taking the first pill on the fifth day of your menstrual cycle. In fact, most birth control pills can be started at any time during your cycle, but there are some important considerations:
1. Starting on the First Day of Your Period: If you start taking the pill on the first day of your period, you are immediately protected against pregnancy. This is often recommended for those who want immediate contraceptive protection.

2. Starting at Other Times: If you start taking the pill at any other time during your cycle, including the fifth day or later, it is generally recommended to use an additional form of contraception (like condoms) for the first seven days of taking the pill. This is because it may take some time for the hormones in the pill to suppress ovulation effectively.

3. The 7-Day Break: The 7-day break is a crucial part of the regimen. During this time, you do not take any pills, and you should expect to have a withdrawal bleed. After this break, you should resume taking the pills regardless of whether your period has ended or not. The effectiveness of the pill is not diminished by the timing of your menstrual cycle as long as you adhere to the 21-day on, 7-day off schedule.

4. Myths about Delayed Start: The idea that starting the pill after the seventh day of your cycle significantly reduces its effectiveness is a myth. What matters is that you take the pills consistently and correctly. If you start taking the pill late in your cycle, just remember to use backup contraception for the first week.

5. Consulting Healthcare Providers: If you have any uncertainties about your specific situation or how to take your birth control pills, it is always best to consult with your healthcare provider. They can provide personalized advice based on your health history and needs.

In summary, you should follow the instructions provided with your birth control pill, which typically involves taking it for 21 days followed by a 7-day break. You can start taking the pill at any point in your cycle, but if you start after the first day, be sure to use backup contraception for the first week. Your health provider is your best resource for any questions or concerns about your birth control method.

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