What class of antiviral medication is Trifluridine used for?

Trifluridine is an antiviral medication specifically used in the treatment of herpes simplex virus (HSV) keratitis. This is a viral infection that affects the cornea and can lead to corneal scarring or vision loss if not treated properly. Trifluridine works by inhibiting the synthesis of viral DNA, effectively reducing the viral load and helping to clear the infection from the cornea.

The formulation of Trifluridine for ophthalmic use allows for direct application to the affected area, enhancing its efficacy in treating HSV keratitis. This targeted action is crucial since it minimizes systemic exposure and potential side effects that might arise from an oral antiviral.

In contrast, the other classes of antivirals mentioned in the options target different viruses and conditions, making them unsuitable for treating HSV keratitis. HIV treatment focuses on inhibiting the replication of the human immunodeficiency virus, hepatitis C medications aim to eradicate the hepatitis C virus, and flu antivirals are designed to combat strains of the influenza virus. Therefore, Trifluridine's specific mechanism and application make it the appropriate choice for HSV keratitis.