Mara,
Are you trying to get off the vicodin? If you're trying to stop using, you don't want to be using it to stop the diarrhea, right?
Lots of drug stores sell a much cheaper generic version of
imodium. If you get the runs badly, you might think about looking into that. There are also more natural ways to help with diarrhea. Eat stuff like bananas, white bread, white rice, etc. Your body will regulate itself eventually. If you have the runs, look out for getting dehydrated. Gatorade can be very helpful.
The vitamin B-6 is to help with the absorption of the L-tyrosine. I would think you could do without the B-6, especially if you get a bad reaction to it anyway.
If you can possibly afford the mineral supplement, you should get it. It helped me a lot in terms of getting some energy and just not feeling miserable.
They give
methocarbamol in detox for back spasms, so it's useful if you run into that problem.
Good luck and please let us know how you do.