Biliary excretion of moxalactam

Area of Science:

• Pharmacology
• Hepatobiliary Medicine
• Infectious Diseases

Background:

• Moxalactam is a broad-spectrum antibiotic.
• Understanding drug excretion is crucial for effective treatment and dosing.
• Biliary excretion plays a role in the pharmacokinetics of certain antibiotics.

Purpose of the Study:

• To investigate the biliary excretion of moxalactam in patients with T-tubes.
• To determine moxalactam concentrations in bile following intravenous administration.
• To compare biliary and serum levels of moxalactam.

Main Methods:

• Studied 11 postsurgery patients with indwelling T-tubes in the common bile duct.
• Administered single intravenous doses of 500 mg or 2,000 mg of moxalactam.
• Measured moxalactam levels in bile and serum at specified intervals.

Main Results:

• Peak moxalactam bile levels ranged from 33.7 to 173.7 µg/mL.
• Bile concentrations were dose-dependent, with higher levels after 2,000 mg.
• In some patients, bile concentrations were 2-12 times higher than serum levels.
• Significant inter-individual variability in biliary excretion was observed.

Conclusions:

• Moxalactam is excreted into the bile in humans.
• The antibiotic achieves high concentrations in bile, suggesting potential efficacy against biliary pathogens.
• Dosing and individual patient factors influence moxalactam's biliary excretion.