1-[(2β,3α,5α,16β,17β)-3-(Acetyloxy)-17-hydroxy-2-(1-piperidinyl)androstan-16-yl]-1-methylpiperidinium Bromide-d3 is deuterium labeled 1-[(2β,3α,5α,16β,17β)-3-(Acetyloxy)-17-hydroxy-2-(1-piperidinyl)androstan-16-yl]-1-methylpiperidinium Bromide (A164495), a metabolite of Vecuronium Bromide (V102500), having neuromuscular and vagal blocking actions.