Metronidazole in breast milk

Area of Science:

• Pharmacology
• Maternal-Child Health
• Infectious Diseases

Background:

• Metronidazole is a common treatment for trichomoniasis.
• Its use in breastfeeding mothers is often contraindicated due to potential infant exposure.
• Limited data exists on metronidazole levels in breast milk.

Purpose of the Study:

• To quantify metronidazole concentrations in breast milk after a single therapeutic dose.
• To determine a safe interval for breastfeeding after maternal metronidazole administration.
• To evaluate a potential treatment regimen for trichomoniasis in lactating women.

Main Methods:

• Assayed breast milk metronidazole concentrations in 3 lactating women.
• Administered a single 2.0-g dose of metronidazole for trichomoniasis.
• Measured drug levels at various time points post-administration (2, 4, 12, 24 hours).

Main Results:

• Peak metronidazole concentrations in breast milk occurred 2-4 hours after dosing.
• Drug levels significantly declined between 12 and 24 hours post-dose.
• Withholding breastfeeding for 12-24 hours substantially reduces infant exposure.

Conclusions:

• A 12-24 hour breastfeeding interruption is a viable strategy to minimize infant metronidazole exposure.
• This regimen may allow safe treatment of trichomoniasis in lactating women.
• Further research could confirm the safety and efficacy of this approach.