Pefcin 400mg Infusion is an antibiotic, used in the treatment of bacterial infections. It is also used in treating infections of the urinary tract, nose, throat, skin and soft tissues, and lungs (pneumonia). It cures the infection by stopping further growth of the causative microorganisms. Pefcin 400mg Infusion is given as an injection into a vein (intravenous), in cases where oral administration is not possible, such as in hospitalized or unconscious patients. It is administered by a healthcare professional. Do not self-administer. Avoid skipping any doses and finish the full course of treatment even if you feel better. Some people may have nausea, headache, and dizziness as side effects of this medicine. You may also notice some injection site reactions like pain, swelling, or redness. These are usually temporary and resolve on their own. Consult your doctor if these side effects persist for a longer duration. Diarrhea may also occur as a side effect but should stop when your course is complete. Inform your doctor if it does not stop or if you find blood in your stools. You should not take this medicine if you are allergic to any of its ingredients. Rarely, some people may have a severe allergic reaction that needs urgent medical attention. Signs of this include rash, swelling of the lips, tongue, or face, shortness of breath, or breathing problems. Special care should be taken in people with kidney or liver problems while taking this medicine.