oral contraceptive pill, progestin, clomiphene citrate, norethindrone, clomiphene, norethindrone acetate, oral contraception, zidovudine, estradiol, medroxyprogesterone, thyroxine, nifedipine, oestradiol, progesterone, gonadotrophin, adrenocorticotropic hormone, ketorolac, luteal phase, flecainide, indinavir, ergocalciferol, estrogen, spironolactone, acetylsalicylic acid, ddi, anovulation, tranylcypromine, clomipramine, hmg, intrauterine device, catapres, triiodothyronine, viramune, secondary amenorrhea, nadolol, estrone, thiazide, omeprazole, oral contraceptive, nitroprusside, indomethacin, spermicides, endometrial carcinoma, cefuroxime, chlorthalidone, quinidine, gonadotropin, thyrotropin, leflunomide, hydroxychloroquine, allopurinol, emend, alpha blocker, combivir, fluvastatin, piroxicam, miconazole, saquinavir, oestrogen, glyburide, angiotensin converting enzyme, cholecalciferol, thyroxin, valerate, pimozide, antiemetic, diethylstilbestrol, pessary, metformin, oophorectomy, corpus luteum, enalapril, aminophylline, antithrombin, phenytoin, nelfinavir, famotidine, indapamide, ergotamine, hydralazine, estriol, anticonvulsants, isotretinoin, tricyclic antidepressant, pyrimethamine, tamoxifen, ovariectomy, glucocorticoid, sulindac, salicylates, dapsone, androgens, amenorrhoea, pyridoxine, plasmin, ace inhibitor, fumarate, monophosphate, carvedilol, crixivan, aglycone, calcitonin, steroid, opioid, corticosteroid, androgen, anticoagulants, progestogens, analgesic, anesthetic, anticoagulant, estrogens, antibiotic, progestins, agonist, initiator, insecticide, opiate, antacid, dosage, antidepressant, laxative, nonprescription, sedative, contraceptive, diuretic, dopa, injectable, postcoital, amphetamine