There is a loperamide mega thread that can be found in the search engine.
If you are looking for any replies, you must lay out some facts like: how long was he on loperamide and how high did he start taking the loperamide. That would help.
Start tapering the dose slow say 2 mg every few days and slowly getting that garbage out of his system. Get some Gatorade and fluids going. I gave a very basic idea on how to start a taper. The speed at wich you taper is based on what you can handle.
Others will weigh in on your question.