Postinor is a type of oral contraceptive pill. It contains Levonogestrel which is a type of hormone used to prevent pregnancy. This pill must be taken within 72 hours after sexual activity, and the second pill should be taken after 12 hours. Just like every other medication, this medication has a list of side effects along with its usage such as nausea, vomiting, vaginal bleeding, breast pain, headache, dizziness, fatigue and others. If any of these would to occur to you, please seek medical attention immediately. This medication is to be taken strictly under a doctor’s advice and is to be kept away from children. Always adhere to the dosage instruction given by the doctor to avoid any overdose or other unwanted effects. Also do not pass on this medication to those who you think have the same symptom. It is best to use it only after consulting a doctor.