<unk>  is a phosphodiesterase inhibitor that is FDA approved for the treatment of vascular spasm associated with acute myocardial infarction (coronary occlusion), angina pectoris, peripheral vascular disease, peripheral and pulmonary embolism.   Common adverse reactions include general discomfort, nausea, abdominal discomfort, anorexia, skin rash, malaise, vertigo and headache..
Papaverine
Moxaverine
Oxymetazoline hydrochloride
Oxymetazoline
Tolazoline
Ethanolamine
Terbutaline 
Prothionamide