You asked if he COULD drink during treatment not if he should,and the simple answer to that is yes he can,and if he is anything ike my husband he will!!!There was only a very short period of time when Rob physically couldnt swallow a beer and i hoped the damage to his taste buds would make him hate the stuff but as fate would have it he never had a problem with his taste buds so was back on it as soon as he could swallow again.The moral and ethical issue is a different matter,and the answer to that is also quite simple .NO he definately shouldnt,but i hope you have more luck persuading him not to than i did!!!