Remdesivir is primarily used as an antiviral medication to treat certain viral infections. Its most notable application is in the treatment of COVID-19, particularly in hospitalized patients with severe symptoms. It works by inhibiting the replication of the virus, helping to reduce the severity and duration of the illness.

In addition to COVID-19, remdesivir has shown potential in treating other RNA virus infections, such as Ebola virus disease. It has been studied in clinical trials for its effectiveness against these viruses, though its use is more established in the context of COVID-19.

The drug is typically administered intravenously in a hospital setting, under medical supervision, to ensure proper dosing and monitoring for potential side effects. Its use has been a significant part of the therapeutic approach to managing severe cases of COVID-19, especially during the pandemic.