Benylin 4flu tablets are for the relief of symptoms associated with colds and flu the tablets contain paracetamol which is an analgesic it also contains an antipyretic which means it helps to relieve pain and fever high temperature diphenhydramine is an antihistamine and antitussive which helps to relieve coughing and helps to dry secretions these tablets help to soothe and treat coughing fever headache muscular aches and pains congestiondosage adults the elderly and children over 12 y