If a woman takes medication for a cold or an anti-inflammatory drug, it usually does not affect her menstruation. However, if the medication is to promote blood circulation or coagulation, it will affect menstruation and women will experience increased menstrual flow, prolonged periods or reduced menstrual flow and shortened periods. During menstruation, women should pay attention to proper rest, do not exert themselves, take good care of warmth, pay attention to proper nutrition to facilitate the discharge of menstrual blood and reduce the adverse effects on the body caused by the discharge of menstrual blood. During menstruation, the body’s resistance and immunity are poor. If women need to take medication because of illness, they should take it under the guidance of a doctor.