Linezolid is an antibiotic medication used to treat certain bacterial infections, including pneumonia, skin infections, and infections that are resistant to other antibiotics. It is a member of the oxazolidinone class of antibiotics and works by preventing the growth of bacteria. Linezolid is available in oral and injectable forms and is often used as a second-line treatment when other antibiotics have failed. It is available under various brand names, including Zyvox, Linospan, and Linzolid.