Is it safe to take omnicef while pregnant? Kumar Jeetendra | March 1, 2023 Omnicef, also known as cefdinir, is a cephalosporin antibiotic that is utilised in the treatment of a wide variety of bacterial illnesses. In the United States, the Omnicef brand name has been taken off the market. There is a generic version of Omnicef that can be purchased. Cefdinir is an extended-spectrum, semisynthetic cephalosporin that can …