Pantopon

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Pantopon is a preparation of opiates made up of all of the alkaloids present in opium in their natural proportions as hydrochloride salts . It can sometimes be tolerated by persons who are allergic to morphine . Pantopon is just opium with all of the tar and other insoluables removed in an injectable form which is nearly as potent as morphine is by weight .

Other drugs of the same type have include opium alkaloid sulphates (Omnopon), phosphates, and valerates.

"Compendium of Pharmaceuticals and Specialties" http://en.wikipedia.org/wiki/Compendium_of_Pharmaceuticals_and_Specialties