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Abstract:
An intravenous dose of temocillin 1g was administered to 5 healthy human volunteers from whom peripheral lymph, serum and urine were monitored for 12 hours. The concentrations after 1 hour were 14.3 mg/L in lymph and 58.1 mg/L in serum. The mean peak concentration in lymph (appearing between 1.5 and 2 hours) was 30.6 mg/L, and the simultaneous serum level was 47.8 mg/L. The lymph concentrations were always below those in serum, and the elimination half-life was 4.4 hours from lymph compared with 4.9 hours from serum. The ratio between the total areas under the concentration curves in lymph and in serum was 0.56, which reflects the ability of temocillin to penetrate to lymph. Serum protein binding appeared to impede the rate of transport from serum to lymph, but when compared with the results of less highly bound penicillins the total penetration of temocillin was better than expected.
Insights
Temocillin effectively penetrates peripheral lymph tissue in humans, reaching concentrations that indicate good distribution. This pharmacokinetic profile suggests favorable tissue penetration for this penicillin antibiotic.
Area of Science:
- Pharmacokinetics
- Antibiotic Research
- Human Physiology
Background:
- Temocillin is a penicillin antibiotic with a broad spectrum of activity.
- Understanding antibiotic distribution into tissues like lymph is crucial for optimizing treatment efficacy.
- Previous studies on penicillin penetration into lymph are limited.
Purpose of the Study:
- To investigate the pharmacokinetic profile of temocillin in human peripheral lymph and serum.
- To determine the extent and rate of temocillin penetration into interstitial lymph fluid.
- To assess the influence of serum protein binding on temocillin's lymph penetration.
Main Methods:
- Intravenous administration of 1g temocillin to 5 healthy volunteers.
- Serial sampling of peripheral lymph, serum, and urine over 12 hours post-administration.
- Quantification of temocillin concentrations using validated analytical methods.
- Pharmacokinetic analysis including peak concentrations, half-life, and area under the concentration-time curve (AUC).
Main Results:
- Temocillin achieved significant concentrations in peripheral lymph (14.3 mg/L at 1 hour, peak 30.6 mg/L).
- Lymph concentrations were consistently lower than simultaneous serum concentrations (58.1 mg/L at 1 hour, peak 47.8 mg/L).
- The ratio of total AUC in lymph to serum was 0.56, indicating substantial lymph penetration, which was better than expected for a highly protein-bound penicillin.
Conclusions:
- Temocillin demonstrates good penetration into human peripheral lymph following intravenous administration.
- Serum protein binding may influence the rate of lymph penetration, but overall penetration is favorable.
- The pharmacokinetic data supports the potential clinical utility of temocillin in infections involving lymphatic tissues.