Women can use interferon during their menstrual period and interferon will not affect a woman’s menstrual cycle. However, if the interferon used by a woman is vaginal, it is not recommended. Because vaginal bleeding during menstruation will flush the medication out of the vagina and will not be therapeutic, it is recommended to wait until the menstruation clears to use the medication. During menstruation, it is not recommended to take any medication with blood-boosting or blood-stopping effects, as this may lead to an increase in menstrual flow or low menstrual flow. Women’s bodies are weaker and their resistance is lower during their periods, so they must pay attention to rest, not to be overly tired, not to do strenuous exercise, and to keep warm.