Which category does Valacyclovir fall under in pregnancy?

Valacyclovir is classified as a category B drug during pregnancy. This means that studies in animals have not shown any harm to the fetus, and while there are limited human studies, they do not indicate an increased risk of adverse effects when the medication is used during pregnancy. Category B drugs are generally considered safe for use in pregnant individuals, particularly when the benefits outweigh potential risks.

In contrast, category A drugs have been shown to be safe in controlled human studies, while category C drugs may have adverse effects in animal studies, but the potential benefits in pregnant individuals may justify their use despite risks. Category D drugs have evidence of fetal risk but may still be used if the benefits to the mother outweigh the potential risks to the fetus. Valacyclovir's category B status indicates a favorable safety profile for its use in pregnant patients, emphasizing its limited risk compared to other categories.