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Methyldopa-d3 (hydrochloride) is deuterium labeled Methyldopa (hydrochloride). Methyldopa hydrochloride (L-(-)-α-Methyldopa hydrochloride) hydrochloride, a potent antihyoertensive agent, is an alpha-adrenergic agonist (selective for α2-adrenergic receptors). Methyldopa hydrochloride is a proagent and is metabolized (α-Methylepinephrine) in the central nervous system[1][2].

[1] Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019;53(2):211-216. DOI:10.1177/1060028018797110
[2] Sweet CS. New centrally acting antihypertensive drugs related to methyldopa and clonidine. Hypertension. 1984;6(5 Pt 2):II51-II56. DOI:10.1161/01.hyp.6.5_pt_2.ii51
[3] Fox GR, et al. The effects of phenobarbital, atropine, L-alpha-methyldopa, and DL-propranolol on dieldrin-induced hyperglycemia in the adult rat. Toxicol Appl Pharmacol. 1985;78(3):342-350. DOI:10.1016/0041-008x(85)90239-x