Can Valtrex medication cause a false pregnancy test?

Valtrex (valacyclovir) is not known to cause false positives on pregnancy tests. Pregnancy tests typically detect the hormone human chorionic gonadotropin (hCG), and Valtrex does not interfere with hCG production or testing. However, if there are concerns about pregnancy or the accuracy of a test, it’s best to consult a healthcare professional for further evaluation.