N-Benzyl-1-phenoxy-d5-propan-2-amine Hydrochloride is the labeled analogue of N-Benzyl-phenoxyisopropylamine Hydrochloride (B288780), a metabolite of phenoxybenzamine (P227990), an irreversible α-antagonist used in the treatment of hypertension, with a relatively slow onset and prolonged effect when compared to alternative α-blockers.