the Effects of Pre- and Post-Coital Contraceptives - Obstetrics and Gynecology

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Emergency contraception pills (ECPs)


Hello, doctor.
I would like to ask about starting to take pre-exposure contraceptive pills on the fifth day after my period.
I had sexual intercourse about four days after starting the pills.
After that, I was concerned and took emergency contraceptive pills, but I continued to take the pre-exposure contraceptive pills at the same time every day.
Will this have any impact on my body? Thank you.

h, 20~29 year old female. Ask Date: 2015/09/01

Dr. Lü Lizheng reply Obstetrics and Gynecology


In principle, taking preemptive contraceptive pills should provide contraceptive effects, so there is no need to take emergency contraceptive pills afterward.
Since you have already taken them, it is fine as long as you do not experience any discomfort.
If you have irregular menstruation or other discomfort, then consider seeking medical attention.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/09/01

More Info


When it comes to understanding the effects of pre- and post-coital contraceptives, it's essential to clarify how these methods work and their interactions with each other. Pre-coital contraceptives, such as oral contraceptive pills (OCPs), are designed to prevent ovulation and thus reduce the likelihood of pregnancy when taken consistently and correctly. Post-coital contraceptives, commonly referred to as emergency contraceptive pills (ECPs), are intended for use after unprotected intercourse to prevent pregnancy, primarily by delaying ovulation.

In your case, you mentioned starting a pre-coital contraceptive pill after your menstrual cycle and engaging in sexual intercourse around the fourth day of taking the pill. Following this, you took an emergency contraceptive pill due to concerns about potential pregnancy. It’s important to note that taking an emergency contraceptive pill while on a regular contraceptive regimen is generally safe and should not cause adverse health effects. However, it is crucial to understand how these two methods interact.

1. Effectiveness of Pre-Coital Contraceptives: When taken as directed, pre-coital contraceptives can be highly effective in preventing pregnancy. If you started taking the pill consistently from the fifth day after your period, it is likely that you were already protected by the time you had sexual intercourse on the fourth day of taking the pill. Most OCPs take about seven days of consistent use to reach maximum effectiveness, but some formulations may provide protection sooner.

2. Use of Emergency Contraceptive Pills: Taking an emergency contraceptive pill after having unprotected sex while on a regular contraceptive regimen is a common practice for added reassurance. ECPs work primarily by preventing or delaying ovulation. If you were already ovulating, the effectiveness of the ECP may be reduced, but it will not harm your body or interfere with the ongoing effectiveness of your regular contraceptive method.

3. Potential Side Effects: While both types of contraceptives are generally safe, taking them together may lead to some side effects, such as nausea, changes in your menstrual cycle, or breast tenderness. These side effects are usually temporary and should resolve as your body adjusts. If you experience severe side effects or have concerns about your health, it is advisable to consult with a healthcare provider.

4. Continuing Your Contraceptive Regimen: After taking the emergency contraceptive pill, you should continue taking your regular contraceptive pills as scheduled. The emergency contraceptive will not affect the efficacy of your ongoing contraceptive method. However, it is essential to monitor your menstrual cycle, as taking ECPs can sometimes cause your next period to be earlier or later than expected.

5. Consulting a Healthcare Provider: If you have any ongoing concerns about the interaction between these contraceptive methods or experience any unusual symptoms, it is always best to consult with a healthcare provider. They can provide personalized advice based on your medical history and current health status.

In summary, using both pre- and post-coital contraceptives is generally safe and should not negatively impact your health. It’s crucial to continue taking your regular contraceptive pills as directed and to be aware of any changes in your menstrual cycle. If you have further questions or concerns, don’t hesitate to reach out to a healthcare professional for guidance.

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