Dimetapp Childrens Long Acting Cold Plus Cough Relief Syrup, Grape Flavor Temporarily relieves cough due to minor throat and bronchial irritation as may occur with a cold. Its single dose provides your child with up to 8 hours of relief from coughs. This formula comes in a great-tasting grape flavor your kids will love.Temporarily relieves these symptoms due to hay fever or other upper respiratory allergies:Sneezing.Runny nose.Itchy, watery eyes.Itching of the nose or throat.