my dad is suffering from the same problem. myopathy is a vitamin D deficiency disease. if the patient is a vegetarian then try to increase dairy products like cheese, milk, ghee, butter, and others like mushroom, soya bean, corn flakes and other cereals. other options are fish, fish has the highest IU of vitamin D; sunlight is the best option for natural vitamin D. medicines available are vitamin D injections, cod liver oil capsules, etc.