Benzac works by cleaning out deposits of oil under the skin and drying them for this reason it may be two to three weeks until you observe improvement in your skin. It also has mild drying effect, kobe benzac ingen recepter which allows excess oils and dirt to be easily washed away from the skin. If they continue or are bothersome, or if you experience excessive itching, burning, tenderness, redness of your skin, or extreme dryness or if you notice any other side effects not listed you should check with your doctor immediately. Lifestyle changes such as stress reduction programs, exercise and dietary changes may increase the effectiveness of this medicine.