>Because of the tight controls on the drug, prescriptions are almost always sent electronically from provider to pharmacy, and any changes or transfers must go through the provider.

Very different from where I live in Canada. I just get a written script and can take it wherever I like. The pharmacy submits the info to the provincial drug tracking program to make sure it's all kosher and when it is I'm on my way.

If a pharmacy every refused to fill it I could just take the script elsewhere.