Treatment for inflammatory myopathies and muscular dystrophies involves drug therapy, while treatment for metabolic myopathies involves evading scenarios that overwork the muscles. Some physicians suggest that patients suffering from myopathy maintain a low weight, as heavier weights exact more stress on the muscles, as stated by Remedy's Health Communities.
With regard to muscular dystrophies, corticosteroids such as prednisone and deflazacort appear to work most effectively. Both drugs enhance walking ability and strength for approximately six months in boys suffering from Duchenne dystrophy. After this initial improvement, these medicines can delay the disease's progression for up to five years. Side effects include weight gain, thinning of skin, hypertension, depression and osteoporosis, notes Remedy's Health Communities.
For inflammatory myopathies, such as dermatomyositis and polymyositis, prednisone is the most common treatment. However, the doctor tapers it to the lowest possible dose, as long-term use can lead to bone loss, depression and hypertension. For metabolic myopathies, the primary treatment is to have the patient stay away from strenuous exercise and other situations that stress the muscles and cause weakness. If breathing problems arise, some patients benefit from using an incentive spirometer. However, no treatment exists (as of 2015) to strengthen the breathing muscles, according to Remedy's Health Communities.