It Is For The Symptomatic Relief Of Troublesome Cough Associated With Upper Respiratory Tract Congestion. The Syrup Contains The Active Ingredients Diphenhydramine Hydrochloride, Ammonium Chloride And Levomenthol. Diphenhydramine Hydrochloride Is An Antihistamine That Is Used To Provide Relief From The Effects Of An Allergy. Ammonium Chloride Is An Expectorant That Helps Loosen Phlegm And Catarrh. Levomenthol Relieves The Discomfort Of Congestion And Also Provides A Cooling Effect In Mouth And Throat.