It has a 40% chance of causing him to have covid again later (as it did for Fauci and both Bidens). It is pretty much worthless. If sore throat is his worst problem, get some saline nose wash and make a 1% iodine solution with it, 10 parts wash and 1 part 10% Betadine. Snuffle it through the nose, tilt head to let it drip back, gargle. Do this 2 times a day. I just had a heck of a cold and this was super effective.