Enhanced blood glucose-lowering effect w/ oral antidiabetics, ACE inhibitors, disopyramide, fibrates, fluoxetine, MAOIs, pentoxifylline, propoxyphene, salicylates & sulfonamide antibiotics. Reduced blood glucose-lowering effect w/ corticosteroids, danazol, diazoxide, diuretics, glucagon, INH, oestrogens & progestogens, phenothiazine derivatives, somatropin, sympathomimetics (eg, epinephrine, salbutamol, terbutaline), thyroid hormones, atypical antipsychotics (eg, clozapine & olanzapine) & PIs. May potentiate/weaken blood glucose-lowering effect w/ β-blockers, clonidine, lithium salts or alcohol. Pentamidine may cause hypoglycaemia, sometimes followed by hyperglycaemia. Reduced/absent signs of adrenergic counter regulation w/ β-blockers, clonidine, guanethidine & reserpine.