papaverine

…opium are morphine (10 percent), papaverine (1 percent), codeine (0.5 percent), and thebaine (0.2 percent). (Papaverine is pharmacologically distinct from the narcotic agents and is essentially devoid of effects on the central nervous system.) About 1804 a young German apothecary’s assistant named F.W.A. Sertürner isolated crystalline morphine as the active…