For people who are trying to deal with the stresses of daily life, the back can only take so much. That's why Doan's Extra Strength Pain Reliever is here to help ease the pain away. The active ingredient is magnesium salicylate, an NSAID that provides targeted back pain relief. In a short amount of time, these tablets go to work, bringing peace to mind and body. Available in a 24-count package. For the temporary relief of minor backache pain. 50 milligrams of magnesium per caplet.