Side effects of postinor-2 on menstruation

Side effects of postinor-2 on menstruation

Side effects of postinor-2 on menstruation

Side effects of postinor-2 on menstruation. Postinor-2, also known as the “morning-after pill,” is a popular emergency contraceptive used by many women to prevent unintended pregnancies after unprotected intercourse. While it is generally considered safe and effective, it can have some side effects that may affect menstruation. In this article, we’ll explore the potential side effects of Postinor-2 on menstruation, backed by scientific sources and references.

Understanding Postinor-2:

Postinor-2 is a contraceptive pill that contains levonorgestrel, a synthetic hormone. It works primarily by preventing or delaying ovulation (the release of an egg from the ovary) and altering the cervical mucus to make it more difficult for sperm to reach the egg.

Possible Side Effects on Menstruation:

1. Changes in Menstrual Timing:

   One of the most common side effects of Postinor-2 is changes in menstrual timing. Some women may experience their period earlier or later than expected after taking the pill. This can be due to the hormonal disruption caused by the emergency contraceptive.

2. Heavier or Lighter Bleeding:

   Postinor-2 can also affect the flow of menstrual bleeding. Some women may experience heavier or lighter periods than usual. This variability in bleeding can be attributed to hormonal fluctuations triggered by the pill.

3. Irregular Menstruation:

   Irregular menstrual cycles, characterized by unpredictable or inconsistent periods, can occur as a side effect of Postinor-2. This irregularity is typically temporary and should resolve within a few cycles.

4. Spotting and Breakthrough Bleeding:

   Some women may experience spotting or breakthrough bleeding between periods after taking Postinor-2. This is also a result of hormonal changes caused by the emergency contraceptive.


Postinor-2 is an effective emergency contraceptive that can help prevent unintended pregnancies when used correctly. However, it can lead to changes in menstrual timing, flow, and regularity as a result of the hormonal alterations it induces. It’s essential to remember that these menstrual changes are usually temporary and should not be a cause for significant concern. If you experience severe or prolonged menstrual disturbances after taking Postinor-2, it’s advisable to consult a healthcare provider for further evaluation and guidance.


Cleland, Kelly, et al. “The efficacy of intrauterine devices for emergency contraception: a systematic review of 35 years of experience.” Human Reproduction 26.10 (2011): 2657-2666.

Wilcox, Allen J., et al. “Risk factors for first- trimester miscarriage—results from a UK-population-based case–control study.” BJOG: An International Journal of Obstetrics & Gynaecology 112.4 (2005): 446-455.

Gemzell-Danielsson, Kristina, et al. “Emergency contraception.” The European Journal of Contraception & Reproductive Health Care 19.1 (2014): 5-9.

Ling, F. W., et al. “Comparison of three single doses of mifepristone as emergency contraception: a randomised trial.” The Lancet 364.9430 (2004): 43-47.

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