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Pregnancy: (Pregnancy Category B) There are no adequate and well-controlled studies in pregnant women. The use of the drug during pregnancy should justify potential benefits to the women against potential risk to the fetus.
Lactation: Aciclovir has been detected in breast milk at concentrations ranging from 0.6 to 4.1 times the corresponding plasma levels. These levels would potentially expose infants to aciclovir dosages of up to 0.3 mg/kg/day. The drug should be used in caution in breastfeeding women.
