Unwanted 21 Days Tablet can be taken with or without food, but take it at the same time to get the most benefit. It should be taken as per your doctor's advice. You will have to take the pill on day one of your menstrual cycle and continue taking it for a whole month. Once the pack gets over, start with a new one. If you experience vomiting within 4 hours of dose intake, take another tablet. In case you missed your dose and you are late by 12 hours in taking the missed dose, use a condom during intercourse for a period of 2 days.