Misoprostol is a
Natural prostaglandin in body is PG E2 whereas Misoprostol and alprostadil are synthetic prostaglandins which are PG E1 analogues. Refer kDT 6/e p181
Prostaglandin E1 analogue
Prostaglandin E2 analogue
Prostaglandin antagonist
Antiprogestin
Autacoids