There is no strict meaning of dysmenorrhea after taking painkillers how long to see the effect, mainly according to the patient’s condition, and different painkillers have different starting time. Clinically, dysmenorrhea is divided into primary dysmenorrhea and secondary dysmenorrhea, and it is recommended that patients diagnose the disease and then follow the doctor’s instructions to use medication. Primary dysmenorrhea refers to dysmenorrhea without organic lesions of the genitals, and most of the pain starts after the onset of menstruation, manifested as cramping pain in the lower abdomen. Recommended painkillers include ibuprofen tablets, diclofenac potassium tablets, etc. Clinically, the onset of effect is usually 20-20 minutes, and the actual onset of effect varies from patient to patient. Secondary dysmenorrhea refers to dysmenorrhea caused by organic lesions in the pelvic cavity, such as endometriosis and adenomyosis. Most of the pain before the onset of menstruation appears in the symptoms of lower abdominal cramping and traction pain. Secondary dysmenorrhea taking painkillers can only treat the symptoms but not the root cause, patients are advised to treat the primary lesion first, and the pain will be relieved during menstruation. Dysmenorrhea patients are recommended to consult a professional doctor, follow the doctor’s instructions for standardized treatment, not blindly use their own medication.