The morning-after pill is used to prevent pregnancy if the contraception is failed or was not used. The pill works for 3 days after sex but it works best within 12 hours. The hormone here present is levonorgestrel, a female-type hormone which is also present in many oral contraceptives.

The morning-after pill prevents the ovaries from releasing an egg and alters the lining of the uterus so that a fertilized egg cannot embed there. It is very effective if it is used in time.

IT WILL NOT HELP IF YOU ARE ALREADY PREGNANT

It is usually used by women who have had unprotected sex or to help rape victims, couples who had condom break or woman who had sex without her knowledge under the influence of alcohol or drugs.
All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most common side effects persist or become bothersome when using levonorgestrel. They include:
Breast tenderness; changes in menstrual flow; diarrhea; dizziness; headache; nausea; stomach pain; tiredness; vomiting.
Seek medical attention right away if any of these severe side effects occur when using levonorgestrel. They include:
Severe allergic reactions (rash, hives, itching, difficulty breathing, tightness in the chest, swelling of the mouth, face, lips, or tongue), severe and persistent lower stomach pain, missed menstrual period, spotting instead of your usual period.
Pregnancy is also a side effect of the morning-after pill.

Although 72 hours are given the problem starts after 24 hours or if the woman had more than once sex.

The rest risk for a pregnancy is always there.

In all the Western countries the morning-after pill is a prescription drug, but in India…