Drotaverine-d10 (hydrochloride) is the deuterium labeled Drotaverine hydrochloride. Drotaverine hydrochloride is a type 4 cyclic nucleotide phosphodiesterase (PDE4) inhibitor and an L-type voltage-dependent calcium channel (L-VDCC) blocker, blocks the degradation of 3,5-cyclic adenosine monophosphate. Drotaverine hydrochloride exhibits in vivo antispasmodic efficacy without anticholinergic effects[1][2].