love the idea and for some it works but in most it reinforces the drug addiction. when most people are in recovery for a drug addiction adding another drug like benedryl that contains the same ingredient that makes meth and other street drugs (dyphenhyromine, pseudoephedrine) isnt good. it will keep the drug addict addicted. kind of like a person doesnt hand a vial of pills to a suicidal person or hand a six pack of alcohol to a recovering alcoholic. now whats done for withdrawal symptoms is medication specifically made that prevents withdrawal symptoms (methodone) and inpatient detox.

my point Im glad it worked for you but thought you might want to know that this can cause meth users to get worse because usually benedryl and sudefed are ingredients for making meth.