<unk> (oral) is a vasodilator that is FDA approved for the treatment of essential hypertension, alone or as an adjunct.   Common adverse reactions include chest pain, palpitations, tachycardia, diarrhea, loss of appetite, nausea, vomiting, and headache.
Hydralazine 
Endralazine
Captopril
Chlorothiazide 
Dihydralazine
Nitroprusside
Cyclothiazide
Furosemide 