How do I switch to Cold sore treatment from another cold sore medicine?

Switching cold sore medicines requires a review of what you already use and why you want to change. Tell your physician about prescription pills, creams, over-the-counter products, and any daily antiviral treatment. Include the dose, the time of your last dose, and any side effects or allergies you have had.

Do not assume different antiviral medicines use matching doses or schedules. Valacyclovir, acyclovir, and famciclovir have different directions. Taking them together without a plan can lead to extra treatment and added risks. If you already take an antiviral every day, do not add this short course or stop your daily medicine without specific instructions.

A licensed physician in your state decides whether switching is appropriate. They will consider kidney function, other medicines, outbreak frequency, and whether your symptoms fit a cold sore. They may also review whether a short outbreak course or another approach fits your needs. Results vary. Before you start, make sure you know which medicine to stop, which to take, and the exact timing shown on your new pharmacy label.