Cefdinir (Omnicef) is an antibiotic in the Cephalosporin family. Cefdinir is often used to treat respiratory tract infections such as pneumonia, bronchitis and sinusitis.
Cefdinir is rarely used to treat acne, but antibiotic susceptibility research suggests that the acne causing P. acnes bacterium is likely to be susceptible to Cephalosporin family antibiotics, including Cefdinir. There is little clinical research on the utility of Cefdinir in the treatment of acne.
Cephalosporin antibiotics are related to Penicillin, and people who are allergic to Penicillins have an increased risk of adverse events when using Cephalosporins.