Common heart drug could ease debilitating muscle stiffness

This early-stage study is testing whether amlodipine, a medication typically used for high blood pressure, is safe and might help people with myotonic dystrophy type 1. Researchers want to see if the drug can improve muscle strength, reduce painful stiffness, and make daily activities easier by affecting calcium in muscle cells. The study will enroll 20 adults to take the drug at different doses and closely monitor their health and muscle function.