Fosfomycin Pregnancy and Breastfeeding Warnings

Fosfomycin is also known as: Monurol

Fosfomycin Pregnancy Warnings

Fosfomycin sodium (IV): This drug should not be used during pregnancy unless the benefit outweighs the risk. Fosfomycin tromethamine/trometamol (oral): This drug should be used during pregnancy only if clearly needed. US FDA pregnancy category: B (fosfomycin tromethamine)

Animal studies have revealed evidence of fetotoxicity, but only at doses which also resulted in maternal toxicity. When administered as the sodium salt (IM injection), fosfomycin crosses the placental barrier in humans. There are no controlled data in human pregnancy. A single 3 g oral dose of fosfomycin tromethamine was given (in water) to 153 pregnant women with bacteriuria. Infecting organisms were eradicated in 96% of patients, with recurrence rate of 3% after 25 to 30 days. Minimal maternal side effects occurred and no serious adverse fetal effects were documented. The trimester in which the drug was administered was not reported. US FDA pregnancy category B: Animal reproduction studies have failed to demonstrate a risk to the fetus and there are no adequate and well-controlled studies in pregnant women.

Fosfomycin Breastfeeding Warnings

LactMed: This drug is not expected to cause harmful effects in the nursing infant, especially if older than 2 months. -Fosfomycin sodium (IV): Use is not recommended unless the benefit outweighs the risk. -Fosfomycin tromethamine/trometamol (oral): A decision should be made to discontinue breastfeeding or discontinue the drug, taking into account the importance of the drug to the mother. Excreted into human milk: Yes (low levels)

Low levels were found in human milk (about 8% of serum levels). After 1 to 2 g via injection, colostrum levels in 2 women were 4.8 mg/L and milk levels were 3.6 mg/L.

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