Tromantadine is primarily used as an antiviral agent, particularly effective against herpes simplex virus infections. It is applied topically in the form of a gel or ointment to treat herpes labialis (cold sores) and herpes genitalis. The compound works by inhibiting the penetration and uncoating of the virus, thereby preventing its replication and spread. Its application helps reduce the severity and duration of herpes outbreaks, providing symptomatic relief. Tromantadine is often used in the early stages of infection to maximize its efficacy. It is generally well-tolerated, with minimal side effects, making it a practical option for managing herpes virus infections.