Ceptin Injection  is a broad-spectrum antibiotic, which means that it is active against a wide variety of bacteria. It is used to treat bacterial infections such as urinary tract infections, skin infections, chest and throat infections, ear infections and sinusitis. It is suitable for adults and older children, and can be taken during pregnancy. Some people who are allergic to penicillin antibiotics may not be able to take cefradine, so make sure your doctor knows if you have ever had an allergic reaction to any other antibiotic.