PGE1 agonists

Misoprostol: used for prophylaxis of GI ulcers when on NSAIDS. Think of drinking "miso" soup to help your stomach pain. Look at the "prost" to remind yourself of its MOA, prostaglandin E1 agonist.

Alprostadil (prostaglandin E1): maintains patency of ductus arteriosus (opposite of what indomethacin or any NSAID does). Look at the "prost" to remind yourself of the MOA, PGE1 agonist and look at the "dil" to remind yourself that it DILates the PDA.