Can you use cephalexin for cold sores?

No, cephalexin cannot treat cold sores. Cephalexin is an antibiotic that is used to treat bacterial infections but not viral infections. Cold sores are caused by the herpes simplex virus and are therefore not treated with cephalexin. Treatment options for cold sores include antiviral creams or pills and over-the-counter medications to relieve pain and discomfort.