Hello dear Understand your concern. Avoid daily use at it causes menstrual problem. It should be take only in emergency, do not take regular. Postinor pil, is a two tablet containing 1.5 mg of synthetic progestin, Levonorgestrel. It is intended for the following uses: 1. Unplanned intercourse in couples that are steady or married; 2. Failed measures of contraception 3. In sexual abuse, rape or incest; For this emergency contraception to be effective, it is necessary to take one 1.5 mg pill of Levonorgestrel on a single day and within 72 hours of unprotected intercourse. Best results are seen when it is taken quickly, within 72 hours of an event, as it takes 72 hours after fertilization for a woman’s body to produce a pregnancy. The level of protection provided by Unwanted 72 is as follows: If taken - within 24 hours – up to 95% effective If a woman should vomit after taking pill, it is recommended to repeat the one time dose for effectiveness in pregnancy prevention under the direction of a healthcare provider. So it may be ineffective in 5%. It causes bloating, menstrual irregularity, nipple discharge due to hormonal imbalance as a side effect. Best regards Dr. Sagar