Cefonen 1gm Injection is an antibiotic belonging to the cephalosporin group, which is used to treat bacterial infections in your body. It is effective in infections of the brain (e.g., meningitis), lungs (e.g., pneumonia), ear, urinary tract, skin & soft tissues, bones & joints, blood, and heart. Cefonen 1gm Injection may also be used to prevent infections during surgery. It is given as a drip (intravenous infusion) or as an injection directly into a vein or a muscle under the supervision of a healthcare professional. Your doctor will decide the correct dose for you. This medicine will be given to you regularly at evenly spaced intervals as per the schedule prescribed by your doctor. Do not skip any doses and finish the full course of treatment even if you feel better. Stopping the medicine too early may lead to the returning or worsening of infection. The most common side effects of this medicine include diarrhea, rash, and changes in liver function tests and blood cell counts. Some people may develop temporary redness or pain at the site of injection. These side effects are usually mild but let your doctor know if they bother you or do not go away. Before taking it, you should let your doctor know if you are allergic to any antibiotics or have any kidney or liver problems. You should also let your healthcare team know all other medicines you are taking as they may affect, or be affected by this medicine.