Tolazoline

Tolazoline
Systematic (IUPAC) name

2-benzyl-4,5-dihydro-1H-imidazole
Clinical data
AHFS/Drugs.com	International Drug Names
Routes of administration	IV
Identifiers
CAS Number	59-98-3^Y
ATC code	C04AB02 (WHO) M02AX02 QV03AB94
PubChem	CID 5504
IUPHAR/BPS	7310
DrugBank	DB00797^Y
ChemSpider	5303^Y
UNII	CHH9H12AQ3^Y
KEGG	D08614^Y
ChEBI	CHEBI:28502^Y
ChEMBL	CHEMBL770^Y
Chemical data
Formula	C₁₀H₁₂N₂
Molar mass	160.216 g/mol
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)

For other uses, see Adrenergics.

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]

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.

Adrenergics

Receptor ligands

α₁

Agonists 6-FNE Amidephrine Anisodine Buspirone Cirazoline Corbadrine Dipivefrine Dopamine Ephedrine Epinephrine Etilefrine Ethylnorepinephrine Indanidine Metaraminol Methoxamine Methyldopa Midodrine Naphazoline Norepinephrine Octopamine (drug) Oxymetazoline Phenylephrine Phenylpropanolamine Pseudoephedrine Synephrine Tetrahydrozoline Tiamenidine Xylometazoline

Antagonists Abanoquil Adimolol Ajmalicine Alfuzosin Amosulalol Anisodamine Arotinolol Atiprosin Atypical antipsychotics (e.g., 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 Nefazodone Neldazosin Niaprazine Nicergoline Niguldipine Pardoprunox Pelanserin Phendioxan Phenoxybenzamine Phentolamine Piperoxan Prazosin Quinazosin Ritanserin Silodosin Spiperone Talipexole Tamsulosin Terazosin Tiodazosin Tolazoline Trazodone 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 Ephedrine Ergotamine Epinephrine Etilefrine Ethylnorepinephrine Guanabenz Guanfacine Guanoxabenz Lofexidine Medetomidine Methamphetamine Methyldopa Mivazerol Naphazoline Norepinephrine Oxymetazoline Phenylpropanolamine Piperoxan Pseudoephedrine Rilmenidine Romifidine Talipexole Tetrahydrozoline Tiamenidine Tizanidine Tolonidine Urapidil Xylazine Xylometazoline

Antagonists 1-PP Adimolol Aptazapine Atipamezole Atypical antipsychotics (e.g., asenapine, clozapine, lurasidone, paliperidone, quetiapine, risperidone, zotepine) Azapirones (e.g., buspirone, 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

Agonists Abediterol Amibegron Arbutamine Arformoterol Arotinolol BAAM Bambuterol Befunolol Bitolterol Broxaterol Buphenine Carbuterol Carmoterol Cimaterol Clenbuterol Corbadrine Denopamine Dipivefrine Dobutamine Dopamine Dopexamine Ephedrine Epinephrine Etafedrine Etilefrine Ethylnorepinephrine Fenoterol Formoterol Hexoprenaline Higenamine Indacaterol Isoetarine Isoprenaline Isoxsuprine Levosalbutamol Mabuterol Methoxyphenamine Methyldopa Mirabegron Norepinephrine Orciprenaline Oxyfedrine Phenylpropanolamine Pirbuterol Prenalterol Ractopamine Procaterol Pseudoephedrine Reproterol Rimiterol Ritodrine Salbutamol Salmeterol Solabegron Terbutaline Tretoquinol Tulobuterol Vilanterol Xamoterol 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

Reuptake inhibitors

NET

Selective norepinephrine reuptake inhibitors Amedalin Atomoxetine (tomoxetine) Ciclazindol Daledalin Edivoxetine Esreboxetine Lortalamine Mazindol Nisoxetine Reboxetine Talopram Talsupram Tandamine Viloxazine

Norepinephrine-dopamine reuptake inhibitors Amineptine Bupropion Fencamine Fencamfamine Hydroxybupropion Lefetamine Levophacetoperane LR-5182 Manifaxine Methylphenidate Nomifensine O-2172 Radafaxine

Serotonin-norepinephrine reuptake inhibitors Bicifadine BTS-54505 Desvenlafaxine Duloxetine Eclanamine Levomilnacipran McN-5652 Milnacipran N-Methyl-PPPA PPPA Sibutramine Venlafaxine WY-45233

Serotonin-norepinephrine-dopamine reuptake inhibitors (S)-Duloxetine 3,3-Diphenylcyclobutanamine Amifitadine Ansofaxine Bicifadine Brasofensine Centanafadine Cocaine Dasotraline Desmethylsertraline Diclofensine DOV-102677 DOV-216303 EXP-561 Fezolamine HDMP-28 Indatraline JNJ-7925476 JZ-IV-10 Liafensine Mazindol Naphyrone Nefazodone Nefopam NS-2359 Perafensine PRC200 SEP-228431 SEP-228432 Tedatioxetine Tesofensine

Tricyclic antidepressants Amitriptyline Butriptyline Cianopramine Clomipramine Desipramine Dosulepin Doxepin Imipramine Lofepramine Melitracen Nortriptyline Protriptyline Trimipramine

Tetracyclic antidepressants Amoxapine Maprotiline Mianserin Oxaprotiline Setiptiline

Others Antihistamines (e.g., brompheniramine, chlorphenamine, pheniramine, tripelennamine) Arylcyclohexylamines (e.g., ketamine, phencyclidine) CP-39,332 EXP-561 Fezolamine Ginkgo biloba Indeloxazine Loxapine Nefazodone Nefopam Opioids (e.g., methadone, pethidine (meperidine), tapentadol, tramadol, levorphanol) Pridefine Tedatioxetine Teniloxazine Tofenacin Tropanes (e.g., cocaine) Ziprasidone

VMATs

Amiodarone
Amphetamines (e.g., amphetamine, methamphetamine, MDMA)
Bietaserpine
Deserpidine
Efavirenz
GBR-12935
Ibogaine
Ketanserin
Lobeline
Reserpine
Rose bengal
Tetrabenazine
Vanoxerine (GBR-12909)

Releasing agents

Morpholines Fenbutrazate Fenmetramide Morazone Morforex Phendimetrazine Phenmetrazine Pseudophenmetrazine

Oxazolines 4-MAR Aminorex Clominorex Cyclazodone Fenozolone Fluminorex Pemoline Thozalinone

Phenethylamines (also amphetamines, cathinones, etc) 2-OH-PEA 4-CAB 4-FA 4-FMA 4-MA 4-MMA Alfetamine Amfecloral Amfepentorex Amfepramone Amphetamine Dextroamphetamine Levoamphetamine Amphetaminil β-Me-PEA BDB Benzphetamine BOH Buphedrone Bupropion Butylone Cathine Cathinone Clobenzorex Clortermine Dimethylamphetamine DMA DMMA EBDB Ephedrine Ethcathinone Ethylone Etilamfetamine Famprofazone Fenethylline Fenproporex Flephedrone Fludorex Furfenorex Hordenine 4-Hydroxyamphetamine 5-APDI (IAP) 5-MAPDI (IMP) Iofetamine (123I) Lisdexamfetamine Lophophine MBDB MDA MDEA MDMA Metamfepramone MDMPEA MDOH MDPEA Mefenorex Mephedrone Mephentermine Methamphetamine Dextromethamphetamine Levomethamphetamine Methcathinone Methedrone Methylone Morforex Naphthylaminopropane Ortetamine pBA pCA Pentorex Phenethylamine Pholedrine Phenpromethamine Phentermine Phenylpropanolamine pIA Prenylamine Propylamphetamine Pseudoephedrine Selegiline (also D-Deprenyl) Tiflorex Tyramine Xylopropamine Zylofuramine

Piperazines 2C-B-BZP BZP MBZP mCPP MDBZP MeOPP pFPP

Others 2-ADN 2-AI 2-AT 2-BP 4-BP 5-IAI Clofenciclan Cyclopentamine Cypenamine Cyprodenate Feprosidnine Gilutensin Heptaminol Hexacyclonate Indanorex Isometheptene Methylhexanamine Octodrine Phthalimidopropiophenone Propylhexedrine (Levopropylhexedrine) Tuaminoheptane

Enzyme inhibitors

PAH

3,4-Dihydroxystyrene

AAAD

DBH

PNMT

CGS-19281A
SKF-64139
SKF-7698

MAO

Nonselective Benmoxin Caroxazone Echinopsidine Furazolidone Hydralazine Indantadol Iproclozide Iproniazid Isocarboxazid Isoniazid Linezolid Mebanazine Metfendrazine Nialamide Octamoxin Paraxazone Phenelzine Pheniprazine Phenoxypropazine Pivhydrazine Procarbazine Safrazine Tranylcypromine

MAO-A selective Amiflamine Bazinaprine Befloxatone Brofaromine Cimoxatone Clorgiline CX157 (Tyrima) Eprobemide Esuprone Harmala alkaloids Harmine Harmaline Tetrahydroharmine Harman Methylene blue Metralindole Minaprine Moclobemide Pirlindole Sercloremine Tetrindole Toloxatone

MAO-B selective Ladostigil Lazabemide Milacemide Mofegiline Pargyline Rasagiline Safinamide Selegiline (also D-Deprenyl)

Others

L-Phenylalanine → L-Tyrosine → L-DOPA (Levodopa) → Dopamine
L-DOPS (Droxidopa)

Cofactors

Ferrous Iron (Fe²⁺)
S-Adenosyl-L-Methionine
Vitamin B₃ (Niacin
Nicotinamide → NADPH)
Vitamin B₆ (Pyridoxine
Pyridoxamine
Pyridoxal → Pyridoxal Phosphate)
Vitamin B₉ (Folic acid → Tetrahydrofolic acid)
Vitamin C (Ascorbic acid)
Zinc (Zn²⁺)

Neurotoxins

Others

Activity enhancers BPAP PPAP

Release blockers Bethanidine Bretylium Guanadrel Guanazodine Guanethidine Guanoxan

See also:: Dopaminergics; Melatonergics; Serotonergics; List of adrenergic drugs

Peripheral vasodilators (C04)

Phenylethanolamine derivatives	Isoxsuprine Buphenine Bamethan

Imidazoline derivatives Alpha blockers	Phentolamine Tolazoline

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	Phenylbutazone Mofebutazone Clofezone Oxyphenbutazone

Acetic acid derivatives	Tolmetin Diclofenac Fentiazac

Other	Benzydamine Etofenamate Piroxicam Felbinac Bufexamac Ketoprofen Bendazac Naproxen Ibuprofen Feprazone Niflumic acid Meclofenamic acid Flurbiprofen Suxibuzone Indometacin Nifenazone

Capsaicin derivatives

Zucapsaicin

Other

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