Uses. Magnesium salicylate is used to relieve pain from various conditions. It also reduces pain, swelling, and joint stiffness from arthritis. This medication is known as a nonsteroidal anti-inflammatory drug (NSAID).
MST is a salicylate (sa-LIS-il-ate). It works by reducing substances in the body that cause pain, fever, and inflammation. MST is used to treat mild-to-moderate pain, fever, inflammatory conditions, and pain, swelling, or stiffness associated with arthritis.