Oral Endometriosis Adult: 10 mg bid-tid cyclically or continuously. Recurrent miscarriage Adult: 10 mg bid given cyclically until conception, then continuously until wk 20 of pregnancy, after which dose may be gradually reduced. Menstrual disorders Adult: 10 mg bid in a cyclical regimen. Threatened miscarriage Adult: Initially, 40 mg followed by 10 mg or more every 8 hr, continued for a wk after symptoms are relieved. Reduce dose gradually after that unless symptoms return. Infertility Adult: 10 mg bid. Endometrial protection during menopausal hormonal replacement therapy Adult: 10 mg 1-2 times daily in a cyclical regimen or 5 mg daily.