SUBSTANCES WHICH CAUSE HYPOGLYCEMIA MAY POTENTIATE ITS EFFECT LIKE ORAL HYPOGLYCEMICS, ACE INHIBITORS, FIBRATES, FLUOXETINE, SALICYLATES & SULPHONAMIDE ANTIBIOTICS. SUBSTANCES THAT REDUCE THE HYPOGLYCEMIC EFFECTS OF INSULIN GLARGINE ARE CORTICOSTEROIDS, DIURETICS, OESTROGENS, PROGESTERONES, PHENOTHIAZINE DERIVATIVES & THYROID HORMONES. BETA BLOCKERS, LITHIUM SALTS & ALCOHOL MAY POTENTIATE OR WEAKEN THE BLOOD GLUCOSE LOWERING EFFECTS OF INSULIN.