Arenol paracetemol (500mg) is a widely used over-the-counter analgesic (pain reliever) and antipyretic (fever reducer). It is commonly used for the relief of headaches and other minor aches and pains and is a major ingredient in numerous cold and flu remedies. The onset of analgesia is approximately 11 minutes after oral administration of paracetamol,and its half-life is 1–4 hours..