Norethindrone tablets for the treatment of dysmenorrhea usually requires 3 courses of treatment, but due to individual differences and different treatment effects, the exact time cannot be determined. Norethindrone tablets is a synthetic progestin preparation, through the continuous proliferation of the uterine lining into the secretory phase and inhibit the continuous proliferation of the uterine lining, after stopping the drug will lead to the complete stripping of the lining and play a role in stopping bleeding and adjusting the menstrual cycle, you need to take 3 courses of treatment, that is, three menstrual cycles can be returned to normal in general. For patients with abnormal uterine bleeding, it is recommended that they go to the gynecology department of a regular hospital to improve the blood HCG, ultrasound and other related examinations, except for pregnancy-related diseases such as pre-eclampsia, ectopic pregnancy, and organic diseases such as uterine fibroids, endometrial polyps, etc., and then follow the doctor’s instructions to use estrogen and progesterone to actively treat the problem, rather than blindly using medication.