Pseudomorphine (also known as oxydimorphine or dehydromorphine) is an inactive, natural dimerisation product of the morphine molecule in tandem and thus a common impurity in morphine concentrations.

[2] This compound may be synthesized by the oxidative coupling of morphine by potassium ferricyanide.

[1] Pseudomorphine contributes very little to morphine's effects.

It produces no effects in the central nervous or gastrointestinal systems, but it might have some effects on the circulatory system.

This analgesic-related article is a stub.