One day overnight delivery of medicines like Xanax (Alprazolam), Tramadol (Ultram), Ambien Adderall, Percocet, Methadone without any prescription, Original Tablets. Darvon is the brand name version for generic propoxyphene hydrochloride, an odorless crystalline powder, white in color, and slightly bitter. Each Darvon pulvule contains 65 milligrams of propoxyphene hydrochloride. Apart from the active ingredient, it also contains inactive ingredients such as magnesium stearate, gelatin, starch, silicon, titanium dioxide, and color additives FD & C Yellow No. 6 and D & C Red No. 33.