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On the absorption of clavulanic acid
G D Allen1, P E Coates, B E Davies
1Drug Metabolism and Pharmacokinetics Dept., Beecham Pharmaceuticals Research Division, Harlow, Essex, U.K.
Biopharmaceutics & Drug Disposition
|March 1, 1988
Summary
Clavulanic acid absorption occurs in three phases, with most occurring rapidly. Capsule formulation increased initial absorption time but did not significantly alter overall mean absorption time.
Area of Science:
- Pharmacokinetics
- Drug Absorption and Distribution
Background:
- Oral clavulanic acid pharmacokinetics are complex and not fully described by simple models.
- Understanding the absorption profile is crucial for optimizing therapeutic efficacy.
Purpose of the Study:
- To characterize the oral absorption phases of clavulanic acid.
- To compare absorption kinetics between oral solution and capsule formulations.
Main Methods:
- Loo-Riegelman method for analyzing oral absorption phases.
- Statistical moment analysis for intravenous and oral solution data.
- Weibull analysis for oral solution data.
Main Results:
- Oral absorption of clavulanic acid exhibits three distinct phases: initial slow (approx. 20%), rapid (approx. 70%), and final slow (approx. 5%).
- Statistical moment analysis yielded a mean residence time of 56 min and mean absorption time of 43 min for intravenous and oral solutions.
- Weibull analysis indicated a lag-time of 8 min and mean absorption time of 46.8 min for oral solutions.
- Capsule formulation increased lag-time but did not significantly affect mean absorption time.
Conclusions:
- Clavulanic acid oral absorption is a multi-phasic process.
- Formulation (capsule vs. solution) impacts the initial absorption phase but not the overall mean absorption time.