I was on effexor.One needs to wean off very slowly,.The symptoms he has are all withdrawal and can last up to 4 months till his system gets back to normal.Nervousness,even mania sometimes can happen.If it gets too bad he can get ativan to help.The nausea can be horrendous,usually sucking on lemon or dried crackers help.If not he would need compazine.He is going to feel pretty crummy for awhile.The only thing is to wait it out.Maybe he will be one of the fortunate who gets rid of the drug out of their system in 4 weeks.Good luck.