Nurofen Double Strength 400mg tablets provide effective relief from pain in 1 tablet, for up to 8 hours. They are for relieving the temporary relief of pain and/or inflammation associated with arthritic pain, muscular pain, back pain, headache, migraine headache, tension headache, period pain, dental pain, and sinus pain. Reduces fever. Adults and children from 12 years can take 1 tablet every 4 to 6 hours as necessary, but not more than 3 tablets in 24 hours. It is a pharmacist-only medication and should be kept out of reach of children. If symptoms persist, talk to your health professional. Do not give to children under 12 years of age. Unless advised to by a doctor, adults should not take this medicine for longer than a few days at a time, and adolescents (12–17 years) should not take it for longer than 48 hours.