The hydrochloride salt of a diacetyl derivative of the opiate morphine, a naturally occurring alkaloid extracted from the seedpod of the Asian poppy (Papaver sp.). Once administered, diamorphine (or diacetylmorphine) is rapidly hydrolyzed to 6-monoacetylmorphine (6-MAM) and then to the end-product morphine which binds to opiate receptors located throughout the mammalian nervous and gastrointestinal systems. Inducing a potent analgesia, the use of diamoprhine is often escalated due to a tolerance effect, resulting in abuse that is associated with fatal overdose, abortion, venous sclerosis, and opportunistic infections, among other adverse effects.