Benylin 4 Flu Liquid for Strong Relief From Flu Symptoms 200ml Benylin 4 Flu Liquid 200ml contains a combination of ingredients to provide fast & effective relief from the four main symptoms of flu: fever, body aches & pains, nasal congestion & coughing. With the combination of Diphenhydramine, Paracetamol Pseudoephedrine, Benylins fast acting relief will help you tackle the four main symptoms of flu & have you back on your feet in no time.