Oseltamivir is an antiviral medication that is primarily used to treat and prevent influenza A and B. It is also marketed under the brand name Tamiflu. There are many synonyms for oseltamivir, including Neuraminidase Inhibitor, NA Inhibitor, Oseltamivir Phosphate, Ro 64-0796, Tamiflu, and Zanamivir. Neuraminidase inhibitors work by blocking the activity of the viral enzyme neuraminidase, which is necessary for the virus to spread in the body. Other antiviral medications that are similar to oseltamivir include baloxavir marboxil and rimantadine. However, it is important to always consult with a healthcare professional before taking any medication.