Kwik Stop Styptic Powder For external use on dogs, cats and birds. An aid to stop bleeding caused by clipping nails, docking tails, trimming beaks and minor cuts. Most widely used styptic powder in the world. Now contains Benzocaine. Benzocaine is a local anesthetic which aids in relieving discomfort caused by the minor injuries listed above. All other ingredients used in Kiwk Stop remain the same.