There is no associated increased risk of major birth defects for mothers who are exposed to the antiviral drugs acyclovir, valacyclovir, and famciclovir in their first trimester of pregnancy, a Danish study has found.
The drugs are used to treat a herpes infection which is common in women in the first months of their pregnancies.
The study included 837, 795 babies born in Denmark from January 1996 to September 2008.
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