Power through the toughest of days with our heat patches over abdominal areas to provide warmth and comfort. One pack of menstrual relief heating pads can easily last one to three cycles, depending on the severity and frequency. We recommend using two at once, one over the lower abdomen and the other over the lower back. NAROX is a nonsteroidal anti-inflammatory drug (NSAID). Typically, it is used for menstrual pain. Its effects can be felt within 1 hour. How to use this medication This medication is typically used twice to thrice a day.