Nucleoside analogue antivirals are used to treat viral infections such as hepatitis C, RSV, COVID-19, and more. These medications work by mimicking the building blocks of viral DNA or RNA, which interferes with the virus's ability to replicate and spread. Nucleoside analogue antivirals come in different forms, including oral pills and injections. Examples include ribavirin, remdesivir (Veklury), and molnupiravir (Lagevrio).