Levdobutamine (INN; developmental code name LY‑206243), also referred to as (S)‑dobutamine or levodobutamine, is a synthetic sympathomimetic compound that acts as a selective β₁‑adrenergic receptor agonist and a positive inotropic agent. Chemically it is the (S)‑enantiomer of the clinically used cardiac stimulant dobutamine.
Chemical identity
- IUPAC name: 4‑[2‑[(2S)‑4‑(4‑hydroxyphenyl)butan‑2‑yl]amino]ethyl]benzene‑1,2‑diol
- Molecular formula: C₁₈H₂₃NO₃
- Molar mass: 301.386 g·mol⁻¹
- CAS Registry Number: 61661‑06‑1
- Identifiers: PubChem CID 688441; ChemSpider ID 599903; UNII 0PE6UXH3WG; ChEBI 59805; ChEMBL 1367478
Pharmacology
Levdobutamine is a sympathomimetic agent that selectively stimulates β₁‑adrenergic receptors in cardiac tissue, thereby increasing myocardial contractility (positive inotropy) without substantial β₂‑mediated vasodilation. Its activity derives from the stereospecific configuration of the (S)‑enantiomer, which exhibits higher affinity for the β₁ subtype compared with the (R)‑enantiomer.
Clinical development
The compound was investigated as a potential therapeutic for acute heart failure and other conditions requiring enhanced cardiac output. Despite demonstrating pharmacodynamic activity consistent with a β₁‑agonist, levdobutamine was never brought to market. Reasons for discontinuation have not been publicly detailed.
Regulatory status
Levdobutamine is not an approved pharmaceutical agent in any jurisdiction and is classified as an investigational drug that was never commercialized.
Related compounds
- Dobutamine: The racemic mixture of (R)‑ and (S)‑enantiomers; the (S)‑enantiomer corresponds to levdobutamine, while the (R)‑enantiomer contributes less β₁‑selectivity.
- Other β₁‑agonists: Agents such as dobutamine, dopamine (at higher doses), and milrinone share similar inotropic effects but differ in receptor selectivity and pharmacokinetic profiles.
References
- Wikipedia contributors. “Levdobutamine.” Wikipedia, The Free Encyclopedia.
- PubChem. “Levdobutamine.” National Center for Biotechnology Information.
- ChemSpider. “Levdobutamine.” Royal Society of Chemistry.
