Norpil 1.5 mg Levonorgestrel is an emergency contraceptive medicine. It has to be taken within 72 hours after the unprotected sex or failure of a contraceptive method. Norpil 1.5 mg Levonorgestrel comes in the form of a tablet and is from a group of drugs called progestins. These are female sex hormones that are used in oral contraceptives (often in combination with another hormone, estrogen).