<prompt> Opioid analgesics used in treatment of cough?NoscapineDextromethorphanCodeineMeperidine  <response>: Ans. c Codeine. Ref: KD Tripathi, Pharmacology, 5th ed., 424Codeine or its substitutes are widely used in treatment for suppressing, dry irritating cough.Following are anti-tussives cough centre supressants.a.Opioidcodeine, pholcodeine, ethyl morphine and morphineb.Non-opioidNoscapine, dextrometharphan, oxeladine, clophedianol,cAnti-histaminicschlorpheniramine, diphenyl hydramine, promethazine. 