What are some potentially serious side effects from valacyclovir?

Severe allergic reactions (anaphylaxis) are rare in people taking valacyclovir. Anaphylaxis is marked by the rapid development of flushy, itchy skin rash, swelling of the lips, face, neck, and throat causing difficulty in breathing (angioedema), and a fall in blood pressure that can lead to collapse. If any of these occur, get emergency treatment immediately. Do not use valacyclovir if you have a sensitivity or are allergic to any of the following medications: acyclovir, famciclovir, ganciclovir, penciclovir, or valganciclovir. ​​

Please see the full Prescribing Information for complete safety information. 

This information is not, nor is it intended to be, a substitute for professional medical advice, diagnosis, or treatment, and should never be relied upon for specific medical advice. If you have any questions or concerns, please talk to your healthcare provider. 

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