Generic name Bronchodilators b-agonists Non-selective Isoprenaline
Partially selective Orciprenaline Selective short-acting Fenoterol Pirbuterol Reproterol Rimiterol Salbutamol Terbutaline Tulobuterol Selective long- acting Salmeterol Bambuterol
Interacting drugs
Potential effect
Adrenergic neurone reserpine, bretylium
Measures to take
blockers, Increased sensitivity to directly acting sympathomimetic amines may cause hypertension Tricyclic antidepressants Potentiation of sympathomimetic effects due to inhibition of neuronal uptake b-blockers Antagonism of bronchodilator effect of sympathomimetics. Also risk of hypertension Diethylpropion, mazindol, Pressor effects may be phentermine potentiated Theophylline Decreased plasma levels of theophylline, increased risk of hypokalaemia Monoamine oxidase inhibitors Possible interaction (MAOls) b-blockers Mutual antagonism
Avoid concurrent use
b-blockers
Mutual antagonism
Avoid concurrent use
Theophylline, corticosteroids
Increased risk of hypokalaemia
Monitor serum potassium levels in patients with severe asthma
b-blockers b-blockers suxamethonium
Mutual antagonism Mutual antagonism Prolonged paralysis
Avoid concurrent use
Avoid concurrent use
Avoid concurrent use Use with caution
Use with caution Avoid concurrent use
Avoid concurrent use
Xanthines Aminophylline Choline theophyllinate Lysine theophyllinate
Cimetidine, viloxazine, ciprofloxacin, erythromycin, isoniazid, oral contraceptives, mexiletine, interferons, thiabendazole, propranolol, diltiazem, verapamil, allopurinol, disulfiram, hydrocortisone, fluconazole, troleandomycin, BCG vaccine, vidarabine, enoxacin, fluvoxamine, diuretics Lithium
Increased plasma xanthine may Occur
levels
of Monitor plasma xanthine levels reduce dose if necessary
Increased excretion of lithium Monitor lithium levels reducing plasma levels