I don't understand what your problem is. If you are off the drug because you have been found to be normal without it then you can just get a medical as normal. If you have an issue you could also contact the Aeromedical branch of the FAA in Oklahoma City. Their number is in the first few pages of the FAR/AIM. I don't have mine on it though.

**EDIT***
I just went to that website and it seems kinda bunk. Look under part 67 of the regs and read a little there. It says if you have a medial issue to contact the Aeromedical branch. Give em a shot. If you need the number I'll grab it tomorrow. They can answer for you.