OTC/Lifestyle Pearl of the Day: Theraworx Indication: Theraworx is a foam that offers relief from muscle cramps and spasm. Insight: Contains magnesium sulfate. When used, avoid eye contact. Directions: Shake well and apply 2 pumps to each muscle impacted. Storage: 32 to 120 degrees Source: Theraworx Muscle Cramp And Spasm Relief Foam | Walgreens