POTENTIATES ANTICOAGULANTS, ORAL HYPOGLYCAEMIC AGENTS. RIFAMPICIN, PHENOBARBITONE. : CONCURRENT USE OF OXYPHENBUTAZONE MAY RESULT IN ELEVATED SERUM LEVELS OF OXYPHENBUTAZONE. IN DIABETIC PATIENTS, THE METABOLIC EFFECTS OF ANDROGENS MAY DECREASE BLOOD GLUCOSE AND, THEREFORE, INSULIN/ORAL ANTIDIABETICS REQUIREMENT. ADMINISTRATION OF TESTOSTERONE PROPIONATE LED TO AN INCREASED CLEARANCE OF PROPRANOLOL WHEN CONCURRENTLY USED.