<prompt> Leukotriene antagonist is used asAnti neoplasticAnti asthmaticAnti inflammatoryTocolytic  <response>: Ans. is b i.e., Anti asthmatic Drugs used in asthmaBronchodilatorsDrugs reducing inflammation Leukotriene antagonistsMast cell stabilizers CorticosteroidsAnti-IgE antibodyaB2Sympathomimetics Montelukast Zafirlukast Sodium cromoglycate KetotifenaSystemic Hydrocortisone Prednisolone Omalizumab Salbutamol Bambuteral Formoterol Terbutaline Salmeterol EphedrinebInhalation Beclomethasome Budesonide Fluticasone Flunisolide CiclesonidebMethylxanthines Theophylline Doxophylline AminophyllinecAnticholinergics Ipratropium Tiopratropium Selective PGE4 inhibitors are under clinical trial as antiasthma drugs. These are cilomilast, roflumilast and tofimilast. 