Oral Antiviral: "cold sores" on lips is caused by herpes simplex virus. One usually feels burning sensation before the blisters appear. If you start the oral antiviral Acyclovir or valcyclovir early, at the onset of your symptoms, you can reduce the extent of the flare, and sometime even prevent a flare. See your doctor for the rx.
Answered 10/4/2016
5.2k views
4 doctors weighed in across 2 answers
5 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
6 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question