This study is a randomized clinical trial to compare the effectiveness of combined herbal product based on fennel with medroxyprogesterone tablet on women with oligo/Amenorrhea from the perspective of traditional persian medicine. 40 patients are accepted based on inclusion criteria. Age range in our sample is between 18 to 40 years. Then randomly divided into two groups intervention and control. In the case group is used of fennel combined product and in control group is used pills medroxyprogesterone 5 mg. The herbal product is used twice a day and the duration of the use is two weeks in each period, which begins in the second and third period after one week after menstruation. If the patients do not menstruate after 2 weeks of taking the drug, we will wait for two more weeks again. After four weeks of therapy if the patients still do not menstruate, we will use the drugs for two more weeks . If the patients menstruate at each stage of using the drug, we start it one week after the end of menstruation. But if the patients were not menstruate after four weeks (two-week using of drug and waiting two weeks), we repeat the previous steps. medroxyprogesterone 5 Mg tablets are also used for 10 days(from 16 to 25 monthly cycles in later cycles) and twice a day. The minimum duration of treatment in this study, three months. At baseline for all patients, ultrasound of the ovaries and uterus, CBC, hormonal tests include: TSH, LH, FSH, PRL, Total Testosteron, for patients is requested. At the end of the study, all patients seen and the necessary data were collected through interviews and questionnaires, and all the tests are repeated.