<prompt> The drug not used in acute asthma is :SalbutamolIpratropiumMontelukastHydrocortisone  <response>: Only bronchodilator drugs are useful for the treatment of an acute attack of asthma. Main drugs are:Beta 2 agonists e.g. salbutamol, terbutalineAnticholinergics e.g. ipratropium, tiotropiumMethylxanthines e.g. theophyllineOther drugs used for asthma like mast cell stabilizers, leukotriene receptor antagonists and lipoxygenase inhibitors are indicated only for prophylaxis. 