HeadMed contains Petasides Hybridus (butterbur) which is a perennial shrub found throughout Europe as well as parts of Asia and North America and that has been used medicinally for centuries. Currently, the primary therapeutic uses for Petasites Hybridus are for prophylactic treatment of migraines, and as an antispasmodic agent for chronic cough or asthma. It has also been used successfully in preventing gastric ulcers, and in treating patients with irritable bladder and urinary tract spasms. more information