Anadin original caplets contains 325 mg of aspirin bp and 15 mg of caffeine ph eur. Aspirin belongs to a group of medicines called non steroidal anti inflammatory drugs nsaids that work by relieving pain and reducing inflammation, high temperature and fever. In addition, your medicine contains caffeine, which increases the pain relieving effect of the product. Anadin is for effective relief from mild to moderate pain including headache, migraine, sharp nerve pain neuralgia, toothache, sore throat, period pains and aches and pains, symptomatic relief of sprains, strains, rheumatic pain, nerve pain of the lower back or legs sciatica, lower back pain lumbago, chronic muscle pain, sometimes with tiredness and skin sensitivity fibrositis, muscular aches and pains, joint swelling and stiffness, influenza, feverishness and feverish colds.