A Very Close Friend Is Trying To End His Alcoholism.

A very close friend is trying to end his alcoholism. He had a relapse and today is the third day he is vomiting, not able to keep anything, liquid or solid down. Is there any way to stop the vomiting. He is trying to keep sugar water down. The relapse occurred after 10 days sober. He was a heavy drinker for many years, and is finding it very hard to quit. He is pretty desperate and there is not much help out there for him.
I don't know how to upload information. The relapse occurred after having three teeth extracted and he was put on codeine for the pain. He realizes the severe damage he has caused his liver, pancreas, etc. he is frightened. Age 30.