Is it safe to take Valtrex prior to surgery considering I'll be going under anesthesia?

Your safety is always the number one priority in surgery. This question needs to be asked of your surgeon as opinions can vary. Make sure that your surgeon is aware of all medications and supplements you take including over the counter and prescription.

you should always take valtrex prior to surgery if you are prone to flair ups of herpes or get frequent cold sores

Yes, Valtrex is safe to take before surgery. However, you need to provide your surgeon with a list of all your medications and discuss it with them as well as the anesthesiologist. 

Taking Valtrex prior to surgery is safe, but you should tell your PS and your anesthesiologist ASAP.Kenneth Hughes, MD, ABPS Board Certified Plastic SurgeonLos Angeles, CA

Dear kcell913,
some plastic surgeons recommend their patients to stop taking all medicines prior to surgery but every plastic surgeon has his own preoperative protocol which he recommends to his patients. I would suggest you to discuss this with your plastic surgeon.
Daniel Barrett, MD

Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery