Right now, most available treatments and clinical trials focus on slowing the disease down rather than bringing back muscle that has already been lost, because regrowing those nerve connections is very difficult for the body to do.

You can check the website ClinicalTrials.gov and search for PMA or ALS to see the latest studies, as many trials for ALS also include people with PMA. It is also a good idea to talk to his neurologist about "expanded access" programs, which sometimes allow patients to try experimental drugs that aren't fully on the market yet.