Talk to Liver on Liver

dr my father was diagnosed by a lever damage fews months back... n later on his treatment had started through medication. but the medicines which are prescribed for him are making him feel very weak. so he complained to his Dr and the Dr lessened his dose. but still my father can't resist the medicine. recently after taking his medicine he fell unconscious and it effected his mind so badly that he could hardly remember things... he was immediately taken to the hospital and there he was admitted for 2days...he was sleeping all this time. after he woke up he was not recognizing things n people around him.. After whole 4 to 5days when the effect of the medicine completely finished now his brain is functioning properly and hes normal Alhumdulelah. but i want to know why is this happening to him and what's the actual solution to it? please help me