Talk to the study people. Its the ethical thing to do. They spent a lot of money trying to get the double blind results. They should be able to help get you medicine that is part of a trial.
You can buy NAC 1000mg on Amazon <20 for 120 tabs. Just use the same dose he was on before.. I am not a doctor, but 500 or 1000mg per day might be ok.
Should drink 6 to 8 glasses of water per day taking NAC, to prevent renal crystals.
You can buy NAC 1000mg on Amazon
Wrong.
Post that Amazon link, please.