<prompt> Dextromethorphan is an:AntihistaminicAntitussiveExpectorantAntiallergic  <response>: Drugs for cough includes: 1. Pharyngeal demulcents: Lozenges, cough drops linctuses containing syrup, glycerine, 2.Expectorants Mucokinetics : bronchial secretion enhancers- Sodium or Potassium citrate, Potassium iodide, Ammonium chloride. 3.mucolytics: Bromhexine, Ambroxol, Acetylcysteine, Carbocisteine 3. Antitussives Cough center suppressants- used for dry cough a Opioids Codeine: Pholcodine. b Nonopioids: Noscapine, Dextromethorphan, Chlophedianol. c Antihistamines: Chlorpheniramine, Diphen hydramine, Promethazine. dperipherally acting: prenoxdiazine 4. Adjuvant antitussives -Bronchodilators Salbutamol, Terbutaline. ESSENTIALS OF MEDICAL PHARMACOLOGY 7TH EDITION KD TRIPATHI Page No:218 