In utero exposure to antibiotics and risk of congenital malformations

This population based study compared 10 commonly prescribed antibiotics and compared first trimester exposure to a cohort exposed to either of four penicillins considered safe during pregnancy (ampicillin, pivampicillin, benzylpenicillin and phenoxymethylpenicillin.

No increased risk of congenital malformations was found between the two. Compared to non-exposed pregnancies, small increased risks for major malformations and cardiac malformations were apparent for pivmecillinam, sulfamethizole, and azithromycin.

The overall conclusions are somewhat reassuring.

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