Description_x000D_ Packaging_x000D_ 1, 5, 10 mg in glass bottle_x000D_ Biochem/physiol Actions_x000D_ Luteolytic prostaglandin that induces parturition. Potent vasoconstrictor of pulmonary, coronary, and cerebral arteriole beds. A positive feedback loop between endometrial PG F2α and luteal oxytocin is responsible for completion of luteolysis._x000D_ Luteolytic prostaglandin that induces parturition. Potent vasoconstrictor of pulmonary, coronary, and cerebral arteriole beds. Also stimulates contraction of smooth muscle, such as in bronchi, with possible involvement in asthma. This effect is at least partially mediated through tachykinin release.