@wisco50 - I just did a bit more research and see the OTC med is also sold under the brand name of Voltaren. I have a tube of that, and it is definitely available OTC (I bought mine at Walmart); a generic version is probably also sold OTC. I am not sure what ingredients the compounded version contains that is different, but both doctors who have prescribed it have told me that the prescription version is superior - and having used both, I would agree.