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Tetracycline kinetics in undernourished subjects
International Journal of Clinical Pharmacology, Therapy, and Toxicology
|September 1, 1981
Summary
Undernourished individuals exhibit altered tetracycline pharmacokinetics, including faster distribution and increased clearance. This suggests that modified tetracycline dosage regimens may be necessary for effective treatment in these patients.
Area of Science:
- Pharmacology
- Clinical Nutrition
- Drug Metabolism
Background:
- Tetracycline is a widely used antibiotic.
- Nutritional status can influence drug pharmacokinetics.
- Understanding these effects is crucial for optimizing patient therapy.
Purpose of the Study:
- To investigate the pharmacokinetic differences of tetracycline in well-nourished versus undernourished adult males.
- To determine if nutritional status impacts tetracycline distribution, clearance, and elimination rates.
- To inform potential adjustments in tetracycline dosing for undernourished populations.
Main Methods:
- Intravenous administration of tetracycline (10 mg/kg body weight) to healthy well-nourished and undernourished adult males.
- Analysis of post-infusion plasma concentration-time data.
- Biphasic decline modeling to determine pharmacokinetic parameters like rate constants and volume of distribution.
Main Results:
- Tetracycline exhibited a biphasic elimination pattern in both groups.
- Undernourished subjects showed significantly altered alpha and beta phases.
- Key findings include increased total body clearance and a reduced apparent volume of distribution in undernourished individuals.
Conclusions:
- Altered tetracycline pharmacokinetics in undernourished subjects necessitate consideration for dosage adjustments.
- Maintaining therapeutic tetracycline concentrations above the minimum inhibitory concentration (MIC) may require modified regimens.
- This research highlights the importance of nutritional status in antibiotic therapy efficacy.