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Variability in human drug metabolism and its implications
International Journal of Clinical Pharmacology Research
|January 1, 1983
Summary
Interindividual differences in drug metabolism, influenced by genetics and environment, significantly impact drug therapy. Understanding these variations is crucial for personalized drug dosing and development.
Area of Science:
- Pharmacology
- Pharmacokinetics
- Drug Metabolism
Background:
- Drug absorption, distribution, and renal excretion are known factors influencing drug kinetics.
- Variability in drug metabolizing activity is a major cause of interindividual differences in drug kinetics.
Purpose of the Study:
- To critically review factors influencing interindividual differences in human drug metabolism.
- To discuss the implications of this variability for drug therapy and new drug development.
Main Methods:
- Literature review of genetic factors, age, sex, lifestyle (smoking, alcohol, diet), diseases (liver, thyroid), drug interactions (induction/inhibition), and chemical exposure.
- Analysis of "first-pass" hepatic effect and enzyme saturation in drug kinetics.
Main Results:
- Genetic and environmental factors, including age, sex, diet, and lifestyle, significantly influence drug metabolism.
- Drug-induced enzyme induction/inhibition and chemical exposure also play a critical role.
- First-pass metabolism and enzyme saturation contribute to variable plasma concentrations and non-linear kinetics.
Conclusions:
- A complex interplay between genetic and environmental factors governs human drug metabolism for most drugs.
- Individualized drug dosing is frequently necessary in clinical practice.
- Early assessment of metabolic variability is essential for new drug development.