I realize this answer is a bit take but may be helpful in future.
The average milk levels obtained after trimethoprim 160 mg twice a day range from 1.8 to 2 mcg/mL between two and three hours after dosing. No adverse effects of trimethoprim on nursing infants have been reported.
Trimethoprim and sulfamethoxazole are excreted into human milk. The manufacturer considers the use of trimethoprim-sulfamethoxazole to be contraindicated in breast-feeding women. The American Academy of Pediatrics considers the drug compatible with breast-feeding if the infant is healthy and full-term. Breast-feeding should be avoided if the infant is premature, ill, hyperbilirubinemic, or G6PD-deficient. Because sulfonamides may cause kernicterus in infants less than 2 months of age, a decision should be made to discontinue (or substitute) drug therapy or discontinue nursing based on the importance of the drug to the mother.
If you have concerns then please discuss with your doctor as well.
- Bactrim Information for Consumers
- Bactrim Information for Healthcare Professionals (includes dosage details)
- Side Effects of Bactrim (detailed)
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