<unk>  (or<unk>  is a natural vasodilator.  It was first isolated from bishop's weed (Ammi visnaga), a plant indigenous to the Mediterranean region which has been used for centuries in Egypt as a spasmolytic.
Visnadine
Rupatadine
Tromantadine
Loratadine
Azatadine
Rimantadine
Olopatadine 
Amantadine 