– (S)-Amlodipine-d4 is a deuterated compound of (S)-Amlodipine. (S)-Amlodipine has a CAS number of 103129-82-4. Levamlodipine belongs to the dihydropyridine group of calcium channel blockers. Levamlodipine, also known as S-amlodipine, is a pharmacologically active enantiomer of amlodipine, an antihypertensive and anti-anginal medication. The names S-amlodipine and levamlodipine may be used interchangeably as both substances are the same, however, with differing nomenclature. As a racemic mixture, amlodipine contains (R) and (S)-amlodipine isomers, but only (S)-amlodipine as the active moiety possesses therapeutic activity.