Cetrim Soap is an antiseptic agent used in the treatment of wound infection and burns. It kills bacteria, fungi and cleans wounds, cuts or minor burns, thereby preventing infections. Cetrim Soap is for external use only. You should always use it exactly as your doctor has told you. The affected area should be clean and dry before application. You must wash your hands thoroughly before and after application. Use it regularly to get the most benefit from it. Do not use more than you need as it will not clear your condition faster and some side effects may be increased. If your condition goes on for longer than four weeks or gets worse at any time, let your doctor know.Common side effects include skin irritation, redness, or itching at the site of application. Consult your doctor if these side effects persist for a longer duration. Avoid direct contact with your eyes. In case of direct contact, wash your eyes with water and seek immediate medical attention. You should stop taking it straight away if you have any signs of an allergic reaction. Signs of this include rash, swelling of the lips, throat or face, swallowing or breathing problems, feeling dizzy or faint, and nausea.