Powerful pain relief for up to 8 hours of protection from a single dose. Stop pain from getting in your way with these extra strength tablets from Nurofen. Each tablet contains 512mg of sodium Ibuprofen to eliminate mild to moderate joint, muscle and back pain. They can also be used to reduce a high temperature. Up to 8 hours of protection from: Back and Joint Pain Muscular and Rheumatic Pain Body Aches and Pains Period Pain Inflammation Migraine or Headache Fever Cold or Flu Pain.