Avoid using other medications on the areas you treat with ammonium lactate and urea unless your doctor tells you to.What is ammonium lactate and urea topical?Ammonium lactate is a moisturizer.Urea loosens thick or scaly skin cells and allows them to shed.The combination of ammonium lactate and urea topical (for the skin) is used to treat rough or scaly skin caused by such conditions as eczema or p