Aciclovir (Vyclov) 250mg Lyophilized Powder for Injection is an antiviral medication used to treat infections caused by the herpes virus, such as herpes simplex, varicella-zoster, and cytomegalovirus. The powder is reconstituted for intravenous (IV) infusion and provides a 250mg dose of aciclovir per vial. It is typically used in hospital settings for patients with severe viral infections. Each pack contains 1 vial of the lyophilized powder.