<unk>  is an antihypertensive drug that reduces the release of catecholamines, such as norepinephrine.<unk>  is transported across the sympathetic nerve membrane by the same mechanism that transports norepinephrine itself (NET, uptake 1), and uptake is essential for the drug's action. Once<unk>  has entered the nerve, it is concentrated in transmitter vesicles, where it replaces norepinephrine.It may also inhibit the release of granules by decreasing norepinephrine.
Guanethidine
Sulfisomidine
Indigotindisulfonate
Methoxsalen 
Mannosulfan
Gadoteric acid
Undecylenic acid
Astemizole