Black Haw has a very similar use to Cramp Bark, to which it is closely related. It is a powerful relaxant of the uterus and is used for dysmenorrhea, false labor pains, as well as in threatened miscarriage. Its relaxant and sedative actions explain its power in reducing blood pressure in hypertension, which happens through a relaxation of the peripheral blood vessels. It may be used as an anti-spasmodic in the treatment of asthma. It is also a very effective remedy for hiccoughs.