Vasoactive intestinal peptide acts as a hormone and neurotransmitter in various parts of the body; it is a potent relaxant of smooth muscle and has vasodilator and bronchodilator properties as well as stimulating the gastrointestinal tract to increased secretion. It has been tried for many different biological actions and more recently for the treatment of erectile dysfunction.
Uses: Treatment of primary pulmonary hypertension. Erectile dysfunction.