Anadin Original Double Action 16 Tablets Anadin Original Double Action 16 Tablets Anadin Original Double Action 16 Tablets contain a dual action formula of aspirin and caffeine to help relieve mild to moderate pain. They are suitable for the relief of headache, migraine, toothache, sore throat, period pain, muscular aches and pains, rheumatic pain, feverishness, and the pain and fever associated with colds and flu. Aspirin works to target the source of pain, while caffeine helps to speed up the pain-relieving effect. This product is intended for short-term symptomatic relief when used as directed.