Nurofen Back Pain Heat Patches Nurofen Back Pain Heat Patches are specifically designed to help relieve back pain. The air activated Heat Patches adhere directly to the skin to target the site of pain. Drug-free, they provide up to 8 hours of deep muscle relaxing heat. By increasing the blood flow to the affected area they can aid the recovery from muscular back pain. These are not a medicine. Directions Adults & children ages 12 years & over: Adhere to the inside of underwear over the site of the pain for up to eight hours relief. Use under supervision for children under 12 years of age & the elderly. Not suitable for use by infants. Do not use over the same area of skin for more than eight hours in any 24 hours period.