Effects Of Postinor-2 On Menstration


Postinor-2 is an emergency contraceptive, also known as the ‘morning-after pill’. It is a form of contraceptive that is used after sex, and helps prevent pregnancy when no other forms of pregnancy-prevention techniques were used prior to having sex.

​Postinor-2 ( levonorgestrel), is a safe and effective way to prevent pregnancy after unprotected sexual intercourse. It comes in two pills that are taken within 72 hours after sex. However, because of its easy use, accessibility, and the belief that it prevents pregnancy, a lot of females take this drug regularly in so as not to get pregnant. Although, it's very important you note that Postinor-2 as an emergency contraceptive only and it's not meant to be taken regularly. 

The medication is meant to serve as an emergency for those very rare times such as; if she forgot to take her birth control pills, if the condom broke or slipped off during sexual intercourse, if no birth control methods were used, or you are not certain about the effectiveness of some other form of contraceptive you are using. 

What Postinor-2 is used for

Postinor-2 is an emergency contraceptive only. Postinor-2 is not intended as a regular method of contraception. It is used to prevent pregnancy when taken within 72 hours of unprotected intercourse. It is estimated that Postinor-2 will prevent 85% of expected pregnancies. 95% of expected pregnancies will be prevented if taken within the first 24 hours, declining to 58% if taken between 48 hours and 72 hours after unprotected intercourse. 

It is not known whether Postinor-2 is effective if taken more than 72 hours after unprotected intercourse. 

Before you take Postinor-2

Your doctor or pharmacist should do the following before you start taking Postinor-2: 

🔹If he/she feels you may have been pregnant before this incidence of unprotected intercourse, check to see if you are already pregnant. 

🔹Inquire whether you are currently taking any other medications

🔹Inquire if you have high blood pressure

🔹Advise you to utilize a barrier form of contraception until your next period to avoid pregnancy. 

🔹Recommend that you see your doctor in three weeks, especially if you haven't had your period yet. 

🔹Discuss the need of using contraception on a regular basis. 

Postinor-2Postinor-2 May Not Be Suitable For You If: 

🔹 You have suffered a stroke

🔹 You have had breast cancer

🔹 You have a disease of gastrointestinal tract (such as Crohn's disease) that interferes with the digestion and absorption of your food. 

🔹 You are vomiting or have severe diarrhea. 

If any of these conditions apply to you, make sure to consult your doctor. 

When you must not use Postinor-2 

It not recommended to take Postinor-2 if: 

🔹 You have had unprotected sexual intercourse for more than 72 hours (3 days) earlier in the same menstrual cycle because you might be pregnant already. 

🔹 You are pregnant

🔹 You are allergic to the ingredients used in the production of Postinor-2 tablets. 

🔹 You have a breast cancer

🔹 You are experiencing vaginal bleeding for which you do not know the reason. 

How Postinor-2 works

The active ingredient in Postinor-2 is levonorgestrel.

It is not known exactly how this medication works. It is thought to reduce the chance of pregnancy in two ways:

  • If taken before ovulation, it may delay the release of the egg.
  • If taken after ovulation, it may interfere with the transport of eggs and sperm. 

Dose advice: How to use Postinor-2

  • ​You may choose to take this medication with or without food
  • You may take the medication at any time during the menstrual cycle. 
  • The most common method of taking the medication would be to take the 1st tablet as soon as possible within 72 hours of sexual intercourse; the 2nd tablet must be taken 12 hours after taking the first tablet. Some might be directed to take 2 tablets at the same time within 72 hours of intercourse.
  • The medication is less effective after 72 hours. You should not take more than 4 tablets each month. 
  • If you vomit within 2 hours after taking the medicine, take another tablet as a replacement. Consult a doctor to get an additional dose of the medicine. 

Postinor-2What Should I Do If I Forget To Take The Second Dose? 

If you forget to take the 2nd tablet 12 hours later, take it as soon as possible – do not delay taking the tablet. The tablet works best the sooner you take it after having unprotected sex. It can only prevent you from becoming pregnant, if you take it within 72 hours of unprotected sex. Please contact your healthcare professional if it is more than 72 hours. 


Care must be taken when using Postinor-2 under certain circumstances. Consult with your doctor if you have any of the following:

🔹High blood pressure;

🔹Diabetes mellitus with nephropathy, retinopathy or neuropathy;

🔹Vascular heart disease;

Ischaemic heart disease;


🔹Past history of breast cancer;

🔹Malabsorption (for example caused by vomiting, severe diarrhoea, Crohn’s disease). 

Side effects of Postinor-2

Common side effects

Most often the benefits of taking a medication outweigh the associated side effects. Your doctor would have considered these side effects before starting you on the medication.

Common side effects are those which occur more often among patients given Postinor-2. These include:

  • Nausea, vomiting;
  • Diarrhoea;
  • Dizziness;
  • Headache;
  • Breast tenderness;
  • Vaginal bleeding;
  • Fatigue.

Uncommon side effects

Side effects which occur in less than 1% of patients are considered uncommon. We advise you talk to your doctor if any of the side effects in the list below occur to you. 

  • Ectopic pregnancy. 
  • Acne. 
  • Symptoms of flu. 
  • Swollen face/eyes/lips/tongue. 
  • Difficulty in breathing. 
  • Itchy skin rashes over your whole body. 

Effects Of Postinor-2 On Menstration

Being a hormone, regular use of Postinor messes up your menstrual cycle. Repeated use of the drug may to irregular cycles, missed periods, and prolonged bleeding. As a result, your menstrual cycle may be unnecessarily delayed, or may come earlier at a time you do not expect and are not prepared for. 

It's always important to consult your doctor before taking this medication. 

Kindly drop your thoughts in the comments section below. 

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Sanni Muritador
Sanni Muritadorhttps://www.healthsoothe.com/
Sanni Muritador is a content writer with years of experience. He started his writing career working for opera news. His hobbies include writing, reading, and playing tennis. I read anything and everything available so I know so many useful and useless things. Want to connect with Sanni Muritador? Reach out to him on Facebook @Muritador Sanni.

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