Drug directly acting on blood vessels is:
Ref:KDT 6/e p547 Some drugs used to treat hypeension, such as calcium channel blockers -- which prevent calcium from entering blood vesselwalls -- also dilate blood vessels. But the vasodilators that work directly on the vessel walls are hydralazine and minoxidil.
Hydralazine
Verapamil
Propranolol
Methyaldopa
Cardiovascular system