Increased risk of hypokalemia w/ salbutamol & other β-agonists, corticosteroids, diuretics or xanthines. May prevent adrenergic bronchodilator w/ β-adrenergic blockes (eg, acebutolol, atenolol, labetolol, metoprolol, nadolol, pindolol, propranolol, timolol). Increased risk of heart problems w/ disopyramide, quinidine, phenothiazines or procainamide.