2010-06-23 08:30 Medivir AB GlaxoSmithKline (GSK) and Medivir (STO: MVIR-B) today announced an exclusive agreement for the commercialization of cold sore treatment, Xerclear™ (acyclovir and hydrocortisone) for non-prescription use (OTC) in key global markets. Xerclear™ is the first and only topical herpes labialis (cold sores) treatment clinically proven to help prevent cold sore lesions appearing.