Benylin Dual Action Dry Cough Syrup (100ml). Benylin Dual Action Dry is a medicine which is used to help relieve dry coughs and related congestion symptoms.. The liquid contains:. triprolidine hydrochloride which is an antihistamine that helps stop sneezing, runny nose and watery eyes,. pseudoephedrine hydrochloride which is a decongestant that unblocks stuffy noses and. dextromethorphan hydrobromide which is an antitussive to help stop coughing.. The medicine is for use in adults and children aged 12 years and over.
