a substance formed by the breakdown of protein in the liver. the kidneys filter urea out of the blood and into the urine. urea can also be made in the laboratory. a topical form of urea is being studied in the treatment of hand-foot syndrome (pain, swelling, numbness, tingling, or redness of the hands or feet that may occur as a side effect of certain anticancer drugs). also called carbamide.
出典:Wikipedia