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Bioavailability of commercial tetracycline products
D B Barnett1, R N Smith, N D Greenwood
1Section of Therapeutics, Academic Division of Medicine, University of Sheffield, Royal Infirmary, Sheffield.
Commercial tetracycline products show significant bioavailability variations. Testing revealed inconsistencies in drug disintegration and dissolution, impacting in vivo drug absorption and excretion.
Area of Science:
- Pharmacology
- Pharmaceutical Sciences
Background:
- Tetracycline is a widely used antibiotic.
- Ensuring consistent bioavailability of generic drugs is crucial for therapeutic efficacy.
Purpose of the Study:
- To assess the bioavailability of commercial tetracycline products.
- To identify potential issues with generic drug equivalence.
Main Methods:
- In vitro tests including disintegration and dissolution.
- In vivo studies using serum drug concentration and urinary excretion data.
Main Results:
- Several tetracycline products failed disintegration and dissolution tests.
- In vivo bioavailability varied significantly among products, correlating with in vitro dissolution.
- One product exhibited extremely poor bioavailability based on urinary excretion.
Conclusions:
- Commercial tetracycline products demonstrate significant variations in bioavailability.
- These findings highlight the need for stringent bioavailability testing standards for generic drugs.
- Generic non-equivalence can impact patient treatment outcomes.
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