Benylin 4 Flu Tablets Benylin 4 Flu Tablets provide effective relief from the major symptoms of cold & flu. They contain three active ingredients to fight symptoms: Paracetamol: relieves aches & pains & fever (high temperature). Diphenhydramine: an antihistamine that helps relieve coughing, sneezing & runny nose. Pseudoephedrine: a decongestant that helps unblock stuffy noses. Benylin 4 Flu Tablets are suitable for adults & children aged 6 years & over.