“…First, we included medications which are known antagonists and modulators of sex hormones and widely used to treat sex hormone-related disorders or diseases in sex hormone dependent organs, that is, (1) sex hormones and modulators of the genital system, (2) drugs used against benign prostatic hypertrophy and (3) hormones, hormone antagonists, and related agents in antineoplastic and immuno-modulating therapy. Second, we selected a group of medications not usually prescribed for treating sex hormone related disease, but known to have substantial effects on sex hormone levels and fertility, including (1) metformin,13 (2) spironolactone,14 (3) statins,15 (4) non-steroidal anti-inflammatory drugs16 and (5) H2-receptor antagonists 17. Third, for comparison purposes, we also included drugs for similar medical indications as the second category, but without any influence on sex hormone levels, that is, (1) medications in the treatment of diabetes other than metformin, (2) diuretics other than spironolactone, (3) lipid modifying agents other than statins, (4) other anti-inflammatory agents, analgesics and platelet aggregation inhibitors and (5) other drugs for peptic ulcer and gastro-oesophageal reflux disease.…”