May enhance blood-glucose-lowering effect w/ anti-hyperglycaemic medicinal products, ACE inhibitors, disopyramide, fibrates, fluoxetine, MAOIs, pentoxifylline, propoxyphene, salicylates & sulphonamide antibiotics. May reduce blood-glucose-lowering effect w/ corticosteroids, danazol, diazoxide, diuretics, glucagon, INH, oestrogens & progestogens, phenothiazine derivatives, somatropin, sympathomimetic medicinal products (eg, epinephrine, salbutamol, terbutaline), thyroid hormones, atypical antipsychotics (eg, clozapine & olanzapine) & PIs. May either potentiate or weaken blood-glucose-lowering effect of insulin by β-blockers, clonidine, lithium salts or alcohol. May cause hypoglycaemia w/ pentamidine. May reduce signs of adrenergic counter-regulation w/ sympatholytic medicinal products (eg, β-blockers, clonidine, guanethidine & reserpine). May reduce absorption rate of orally administered medicinal products.