Tolazoline

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-HT_2A agonist drugs such as 25I-NBOMe, DOB and Bromodragonfly (prolonged severe vasoconstriction can lead to gangrene if untreated).[1][2]

Tolazoline
Clinical data

AHFS/Drugs.com	International Drug Names
Routes of administration	IV
ATC code	C04AB02 (WHO) M02AX02 (WHO) QV03AB94 (WHO)
Identifiers
IUPAC name 2-Benzyl-4,5-dihydro-1H-imidazole
CAS Number	59-98-3^Y
PubChem CID	5504
IUPHAR/BPS	7310
DrugBank	DB00797^Y
ChemSpider	5303^Y
UNII	CHH9H12AQ3
KEGG	D08614^Y
ChEBI	CHEBI:28502^Y
ChEMBL	ChEMBL770^Y
CompTox Dashboard (EPA)	DTXSID3023683
ECHA InfoCard	100.000.408
Chemical and physical data
Formula	C₁₀H₁₂N₂
Molar mass	160.216 g/mol g·mol⁻¹
3D model (JSmol)	Interactive image
SMILES N\1=C(\NCC/1)Cc2ccccc2
InChI InChI=1S/C10H12N2/c1-2-4-9(5-3-1)8-10-11-6-7-12-10/h1-5H,6-8H2,(H,11,12)^Y Key:JIVZKJJQOZQXQB-UHFFFAOYSA-N^Y
(verify)

It is however most commonly used in veterinary medicine, to reverse xylazine-induced sedation.[3][4]

References

Bowen JS, Davis GB, Kearney TE, Bardin J. Diffuse vascular spasm associated with 4-bromo-2,5-dimethoxyamphetamine ingestion. Journal of the American Medical Association 1983 Mar 18;249(11):1477-9. PMID 6827726
Thorlacius K, Borna C, Personne M. Bromo-dragon fly--life-threatening drug. Can cause tissue necrosis as demonstrated by the first described case. (Swedish) Lakartidningen. 2008 Apr 16-22;105(16):1199-200. PMID 18522262
Boothe DM (2001). "Anticonvulsant drugs and analeptic agents". In Adams HR (ed.). Veterinary pharmacology and therapeutics. Ames: Iowa State University Press. pp. 378–9. ISBN 0-8138-1743-9. Retrieved September 8, 2008 through Google Book Search.
Hall LW, Clarke KW, Trim CM (2001). "Principles of sedation, analgesia and premedication". Veterinary anaesthesia. Philadelphia: W.B. Saunders. pp. 90–1. ISBN 0-7020-2035-4. Retrieved September 8, 2008 through Google Book Search.

Adrenergic receptor modulators
α₁	Agonists: 6-FNE Amidephrine Anisodine Buspirone Cirazoline Corbadrine Desglymidodrine Dexisometheptene Dipivefrine Dopamine Droxidopa (L-DOPS) Ephedrine Epinephrine Etilefrine Etilevodopa Ethylnorepinephrine Indanidine Isometheptene L-DOPA (levodopa) L-Phenylalanine L-Tyrosine Melevodopa Metaraminol Methoxamine Methyldopa Midodrine Naphazoline Norepinephrine Octopamine (drug) Oxymetazoline Phenylephrine Phenylpropanolamine Pseudoephedrine Synephrine Tetryzoline Tiamenidine XP21279 Xylometazoline Antagonists: Abanoquil Adimolol Ajmalicine Alfuzosin Amosulalol Anisodamine Arotinolol Atiprosin Atypical antipsychotics (e.g., brexpiprazole, clozapine, olanzapine, quetiapine, risperidone) Benoxathian Buflomedil Bunazosin Carvedilol Corynanthine Dapiprazole Domesticine Doxazosin Ergolines (e.g., ergotamine, dihydroergotamine, lisuride, terguride) Etoperidone Eugenodilol Fenspiride Hydroxyzine Indoramin Ketanserin L-765,314 Labetalol mCPP Mepiprazole Metazosin Monatepil Moxisylyte Naftopidil Nantenine Neldazosin Niaprazine Nicergoline Niguldipine Pardoprunox Pelanserin Perlapine Phendioxan Phenoxybenzamine Phentolamine Phenylpiperazine antidepressants (e.g., hydroxynefazodone, nefazodone, trazodone, triazoledione) Piperoxan Prazosin Quinazosin Quinidine Ritanserin Silodosin Spiperone Talipexole Tamsulosin Terazosin Tiodazosin Tolazoline Tetracyclic antidepressants (e.g., amoxapine, maprotiline, mianserin) Tricyclic antidepressants (e.g., amitriptyline, clomipramine, doxepin, imipramine, trimipramine) Trimazosin Typical antipsychotics (e.g., chlorpromazine, fluphenazine, loxapine, thioridazine) Urapidil WB-4101 Zolertine
α₂	Agonists: (R)-3-Nitrobiphenyline 4-NEMD 6-FNE Amitraz Apraclonidine Brimonidine Cannabivarin Clonidine Corbadrine Detomidine Dexmedetomidine Dihydroergotamine Dipivefrine Dopamine Droxidopa (L-DOPS) Etilevodopa Ephedrine Ergotamine Epinephrine Etilefrine Ethylnorepinephrine Guanabenz Guanfacine Guanoxabenz L-DOPA (levodopa) L-Phenylalanine L-Tyrosine Lofexidine Medetomidine Melevodopa Methyldopa Mivazerol Naphazoline Norepinephrine Oxymetazoline Phenylpropanolamine Piperoxan Pseudoephedrine Rezatomidine Rilmenidine Romifidine Talipexole Tasipimidine Tetrahydrozoline Tiamenidine Tizanidine Tolonidine Urapidil Vatinoxan XP21279 Xylazine Xylometazoline Antagonists: 1-PP Adimolol Amesergide Aptazapine Atipamezole Atypical antipsychotics (e.g., asenapine, brexpiprazole, clozapine, lurasidone, paliperidone, quetiapine, risperidone, zotepine) Azapirones (e.g., buspirone, gepirone, ipsapirone, tandospirone) BRL-44408 Buflomedil Cirazoline Efaroxan Esmirtazapine Fenmetozole Fluparoxan Idazoxan mCPP Mianserin Mirtazapine NAN-190 Olanzapine Pardoprunox Phentolamine Phenoxybenzamine Piperoxan Piribedil Rauwolscine Rotigotine SB-269970 Setiptiline Spiroxatrine Sunepitron Tolazoline Typical antipsychotics (e.g., chlorpromazine, fluphenazine, loxapine, thioridazine) Yohimbine
β	Agonists: Abediterol Alifedrine Amibegron Arbutamine Arformoterol Arotinolol BAAM Bambuterol Befunolol Bitolterol Broxaterol Buphenine Carbuterol Carmoterol Cimaterol Clenbuterol Colterol Corbadrine Denopamine Dipivefrine Dobutamine Dopamine Dopexamine Droxidopa (L-DOPS) Ephedrine Epinephrine Etafedrine Etilefrine Etilevodopa Ethylnorepinephrine Fenoterol Formoterol Hexoprenaline Higenamine Indacaterol Isoetarine Isoprenaline Isoxsuprine L-DOPA (levodopa) L-Phenylalanine L-Tyrosine Levosalbutamol Mabuterol Melevodopa Methoxyphenamine Methyldopa Mirabegron Norepinephrine Orciprenaline Oxyfedrine PF-610355 Phenylpropanolamine Pirbuterol Prenalterol Ractopamine Procaterol Pseudoephedrine Reproterol Rimiterol Ritodrine Salbutamol Salmeterol Solabegron Terbutaline Tretoquinol Tulobuterol Vilanterol Xamoterol XP21279 Zilpaterol Zinterol Antagonists: Acebutolol Adaprolol Adimolol Afurolol Alprenolol Alprenoxime Amosulalol Ancarolol Arnolol Arotinolol Atenolol Befunolol Betaxolol Bevantolol Bisoprolol Bopindolol Bornaprolol Brefonalol Bucindolol Bucumolol Bufetolol Bufuralol Bunitrolol Bunolol Bupranolol Butaxamine Butidrine Butofilolol Capsinolol Carazolol Carpindolol Carteolol Carvedilol Celiprolol Cetamolol Cicloprolol Cinamolol Cloranolol Cyanopindolol Dalbraminol Dexpropranolol Diacetolol Dichloroisoprenaline Dihydroalprenolol Dilevalol Diprafenone Draquinolol Ecastolol Epanolol Ericolol Ersentilide Esatenolol Esprolol Eugenodilol Exaprolol Falintolol Flestolol Flusoxolol Hydroxycarteolol Hydroxytertatolol ICI-118,551 Idropranolol Indenolol Indopanolol Iodocyanopindolol Iprocrolol Isoxaprolol Isamoltane Labetalol Landiolol Levobetaxolol Levobunolol Levomoprolol Medroxalol Mepindolol Metipranolol Metoprolol Moprolol Nadolol Nadoxolol Nebivolol Nifenalol Nipradilol Oxprenolol Pacrinolol Pafenolol Pamatolol Pargolol Penbutolol Pindolol Practolol Primidolol Procinolol Pronethalol Propafenone Propranolol Ridazolol Ronactolol Soquinolol Sotalol Spirendolol SR 59230A Sulfinalol Talinolol Tazolol Tertatolol Tienoxolol Tilisolol Timolol Tiprenolol Tolamolol Toliprolol Xibenolol Xipranolol

Peripheral vasodilators (C04)
Phenylethanolamine derivatives	Isoxsuprine Buphenine Bamethan
Alpha blockers	Non-selective Tolazoline Phentolamine Selective α₁-blockers Alfuzosin Doxazosin Prazosin Silodosin Tamsulosin Terazosin
Niacin and derivatives	Niacin Nicotinyl alcohol Inositol nicotinate Ciclonicate
Purine derivatives	Pentifylline Xantinol nicotinate Pentoxifylline Etofylline nicotinate
Ergot alkaloids	Ergoloid Nicergoline Dihydroergocristine
Other peripheral vasodilators	Cyclandelate Phenoxybenzamine Vincamine Moxisylyte Bencyclane Vinburnine Sulcotidil Buflomedil Naftidrofuryl Butalamine Visnadine Cetiedil Cinepazide Ifenprodil Azapetine Fasudil

Topical products for joint and muscular pain (M02)

Anti-inflammatory
preparations,
non-steroids

Pyrazolidines	Clofezone Mofebutazone Oxyphenbutazone Phenylbutazone
Acetic acid derivatives	Diclofenac Fentiazac Tolmetin
Other	Bendazac Benzydamine Bufexamac Etofenamate Felbinac Feprazone Flurbiprofen Ibuprofen Indometacin Ketoprofen Meclofenamic acid Naproxen Nifenazone Niflumic acid Piketoprofen Piroxicam Suxibuzone

Capsaicin derivatives

Zucapsaicin

Other

Dimethyl sulfoxide
Idrocilamide
Tolazoline

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