black haw, an herb found in the eastern United States and across southeastern Canada. ▪ INDICATIONS: This herb is used for dysmenorrhea, menstrual cramps and pain, menopausal metrorrhagia, hysteria, asthma, and heart palpitations. It is also used to lower blood pressure. It is possibly effective at relieving uterine spasms, but effectiveness in other instances has not been verified. ▪ CONTRAINDICATIONS: Black haw should be used with caution in people with kidney stones since it contains oxalic acid.
