Enalaprilat

Enalaprilat
Clinical data
AHFS/Drugs.comMonograph
License data
Legal status
Legal status
Identifiers
  • (2S)-1-[(2S)-2-{[(1S)-1-carboxy-3-phenylpropyl]amino}propanoyl]pyrrolidine-2-carboxylic acid
CAS Number
IUPHAR/BPS
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.071.306 Edit this at Wikidata
Chemical and physical data
FormulaC18H24N2O5
Molar mass348.399 g·mol−1
3D model (JSmol)
  • C[C@H](N[C@@H](CCc1ccccc1)C(=O)O)C(=O)N2CCC[C@H]2C(=O)O
  • InChI=1S/C18H24N2O5/c1-12(16(21)20-11-5-8-15(20)18(24)25)19-14(17(22)23)10-9-13-6-3-2-4-7-13/h2-4,6-7,12,14-15,19H,5,8-11H2,1H3,(H,22,23)(H,24,25)/t12-,14-,15-/m0/s1
  • Key:LZFZMUMEGBBDTC-QEJZJMRPSA-N

Enalaprilat is the active metabolite of enalapril. It is the first dicarboxylate-containing ACE inhibitor and was developed partly to overcome these limitations of captopril. The thiol functional group of captopril was replaced with a carboxylic acid group, but additional modifications were required to achieve a potency similar to captopril.

Enalaprilat, however, had a problem of its own. The consequence of the structural modifications was that its ionisation characteristics do not allow for sufficient GI absorption. Thus, enalaprilat was only suitable for intravenous administration. This was overcome by the monoesterification of enalaprilat with ethanol to produce enalapril.

As a prodrug, enalapril is hydrolyzed in vivo to the active form enalaprilat by various esterases. Peak plasma enalaprilat concentrations occur 2 to 4 hours after oral enalapril administration. Elimination thereafter is biphasic, with an initial phase which reflects renal filtration (elimination half-life 2 to 6 hours) and a subsequent prolonged phase (elimination half-life 36 hours), the latter representing equilibration of drug from tissue distribution sites.

The prolonged phase does not contribute to drug accumulation on repeated administration but is thought to be of pharmacological significance in mediating drug effects. Renal impairment [particularly creatinine clearance <20 mL/min (<1.2 L/h)] results in significant accumulation of enalaprilat and necessitates dosage reduction. Accumulation is probably the cause of reduced elimination in healthy elderly individuals and in patients with concomitant diabetes, hypertension and heart failure.[2][3]

References

  1. ^ "FDA-sourced list of all drugs with black box warnings (Use Download Full Results and View Query links.)". nctr-crs.fda.gov. FDA. Retrieved 22 Oct 2023.
  2. ^ Tocco DJ, deLuna FA, Duncan AE, Vassil TC, Ulm EH (1982). "The physiological disposition and metabolism of enalapril maleate in laboratory animals". Drug Metabolism and Disposition. 10 (1): 15–9. PMID 6124377.
  3. ^ Simon AC, Chau NP, Levenson J (January 1988). "Brachial artery hemodynamic response to acute converting enzyme inhibition by enalaprilat in essential hypertension". Clinical Pharmacology and Therapeutics. 43 (1): 49–54. doi:10.1038/clpt.1988.10. PMID 2826067. S2CID 33083327.

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