Stereoselectivity in drug metabolism

Area of Science:

• Pharmacology
• Drug Metabolism
• Stereochemistry

Background:

• Chiral drugs are frequently administered as racemic mixtures in clinical settings.
• Enantiomers of chiral drugs can possess distinct pharmacodynamic and pharmacokinetic profiles.
• Stereoselective interactions with biological macromolecules underlie these differences.

Purpose of the Study:

• To review the stereochemical aspects of drug metabolism.
• To highlight the importance of stereospecific assays for chiral drugs.
• To explore enantioselective metabolism, enzyme characteristics, and related factors.

Main Methods:

• Comprehensive literature review on stereochemistry in drug metabolism.
• Analysis of enzyme structure-activity relationships in enantiomeric discrimination.
• Discussion of factors influencing stereoselective drug disposition.

Main Results:

• Stereoselective metabolism is a primary driver of pharmacokinetic differences between enantiomers.
• Enzyme structure dictates the degree of enantiomeric discrimination.
• Stereoselectivity serves as a phenotypic characteristic of metabolizing enzymes.

Conclusions:

• Stereospecific assays are essential for correlating chiral drug plasma concentrations with pharmacological effects.
• Enantioselective metabolism, enzyme inhibition/induction, drug interactions, species variations, and polymorphic metabolism are key considerations.
• A thorough understanding of stereochemistry in drug metabolism is vital for optimizing drug therapy.