The U.S. Food and Drug Administration (FDA) has classified most antiviral agents as belonging in either category B (which means that either animal studies have shown no risk to an animal fetus, or human studies have shown no risk to a human fetus) or category C (which means animal studies have shown a risk to animal fetuses, but risk has not been adequately studied in humans).

Patients should discuss the potential risks and benefits of using antiviral agents during pregnancy and breastfeeding with their physicians.