Taking antiviral medication for Cold Sores can prevent a full-on outbreak and reduce transmission to loved ones. Cold sores are blisters that form around the exterior lips or inside the mouth, caused by the Herpes Simplex Virus. Anytime a single cold sore appears it is considered an outbreak, although outbreaks commonly produce multiple sores. Cold sores cause mild discomfort to extreme physical pain. Their severity usually depends on how many previous outbreaks have occurred, as well as how quickly an antiviral (Valacyclovir or Acyclovir) is administered. Keeping meds on hand means you take what you need, when you need it. Privately message a Wisp medical provider to adjust your prescription anytime and start living outbreak-free.