|AHFS/Drugs.com||International Drug Names|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||160.220 g·mol−1|
|3D model (JSmol)|
Tolazoline is a non-selective competitive α-adrenergic receptor antagonist. It is a vasodilator that is used to treat spasms of peripheral blood vessels (as in acrocyanosis). It has also been used (in conjunction with sodium nitroprusside) successfully as an antidote to reverse the severe peripheral vasoconstriction which can occur as a result of overdose with certain 5-HT2A agonist drugs such as 25I-NBOMe, DOB and Bromodragonfly (prolonged severe vasoconstriction can lead to gangrene if untreated).
It is however most commonly used in veterinary medicine, to reverse xylazine-induced sedation.
Tolazoline is an α2 adrenoceptor antagonist that increases skin blood flow in healthy subjects and has been used to relieve acute vasospasm.