Used primarily as an antiviral agent, this compound exhibits activity against certain DNA viruses by interfering with viral replication. It functions as a nucleoside analog, incorporating into viral DNA during synthesis and causing chain termination or faulty replication. It has been investigated for the treatment of herpesvirus infections, particularly in cases resistant to other antiviral drugs. Its structural similarity to natural nucleosides allows it to be recognized by viral polymerases, enhancing its selective uptake into infected cells. Due to limited systemic absorption and potential toxicity, clinical use is often restricted to topical formulations for localized viral infections.