Histamine agonist

A histamine agonist is a drug which causes increased activity at one or more of the four histamine receptor subtypes.

H₂ : Betazole and Impromidine are examples of agonists used in diagnostics to increase histamine.

H₃ : Betahistine is a weak Histamine₁ agonist and a very strong Histamine₃ antagonist (paradoxically histamine increasing).

External links

Histamine agonist at the US National Library of Medicine Medical Subject Headings (MeSH)
MeSH list of agents 82017442

Histaminergics

Receptor
(ligands)

H₁	Agonists: 2-Pyridylethylamine Betahistine Histamine HTMT UR-AK49 Antagonists: First-generation: 4-Methyldiphenhydramine Alimemazine Antazoline Azatadine Bamipine Benzatropine (benztropine) Bepotastine Bromazine Brompheniramine Buclizine Captodiame Carbinoxamine Chlorcyclizine Chloropyramine Chlorothen Chlorphenamine Chlorphenoxamine Cinnarizine Clemastine Clobenzepam Clocinizine Cyclizine Cyproheptadine Dacemazine Decloxizine Deptropine Dexbrompheniramine Dexchlorpheniramine Dimenhydrinate Dimetindene Diphenhydramine Diphenylpyraline Doxylamine Embramine Etodroxizine Etybenzatropine (ethylbenztropine) Etymemazine Fenethazine Flunarizine Histapyrrodine Homochlorcyclizine Hydroxyethylpromethazine Hydroxyzine Isopromethazine Isothipendyl Meclozine Medrylamine Mepyramine (pyrilamine) Mequitazine Methafurylene Methapyrilene Methdilazine Moxastine Orphenadrine Oxatomide Oxomemazine Phenindamine Pheniramine Phenyltoloxamine Pimethixene Piperoxan Pipoxizine Promethazine Propiomazine Pyrrobutamine Talastine Thenalidine Thenyldiamine Thiazinamium Thonzylamine Tolpropamine Tripelennamine Triprolidine Second/third-generation: Acrivastine Alinastine Astemizole Azelastine Bamirastine Barmastine Bepiastine Bepotastine Bilastine Cabastinen Carebastine Cetirizine Clemastine Clemizole Clobenztropine Desloratadine Dorastine Ebastine Efletirizine Emedastine Epinastine Fexofenadine Flezelastine Ketotifen Latrepirdine Levocabastine Levocetirizine Linetastine Loratadine Mapinastine Mebhydrolin Mizolastine Moxastine Noberastine Octastine Olopatadine Perastine Pibaxizine Piclopastine Quifenadine Rocastine Rupatadine Setastine Talastine Temelastine Terfenadine Vapitadine Zepastine Non-generational: Atypical antipsychotics (e.g., aripiprazole, asenapine, clozapine, iloperidone, olanzapine, paliperidone, quetiapine, risperidone, ziprasidone, zotepine) Tetracyclic antidepressants (e.g., amoxapine, loxapine, maprotiline, mianserin, mirtazapine, oxaprotiline) Tricyclic antidepressants (e.g., amitriptyline, butriptyline, clomipramine, desipramine, dosulepin (dothiepin), doxepin, imipramine, iprindole, lofepramine, nortriptyline, protriptyline, trimipramine) Typical antipsychotics (e.g., chlorpromazine, flupenthixol, fluphenazine, loxapine, perphenazine, prochlorperazine, thioridazine, thiothixene) Unknown/unsorted: Belarizine Elbanizine Flotrenizine Napactadine Tagorizine Trelnarizine Trenizine

H₂	Agonists: Amthamine Betazole Dimaprit Histamine HTMT Impromidine UR-AK49 Antagonists: Bisfentidine Burimamide Cimetidine Dalcotidine Donetidine Ebrotidine Etintidine Famotidine Isolamtidine Lafutidine Lamtidine Lavoltidine (loxtidine) Lupitidine Metiamide Mifentidine Niperotidine Nizatidine Osutidine Oxmetidine Pibutidine Quisultazine (quisultidine) Ramixotidine Ranitidine Roxatidine Sufotidine Tiotidine Tuvatidine Venritidine Xaltidine Zolantidine

H₃	Agonists: α-Methylhistamine Cipralisant Histamine Imetit Immepip Immethridine Methimepip Proxyfan Antagonists: A-349,821 A-423,579 ABT-239 ABT-652 AZD5213 Betahistine Burimamide Ciproxifan Clobenpropit Conessine Enerisant GSK-189,254 Impentamine Iodophenpropit Irdabisant JNJ-5207852 MK-0249 NNC 38-1049 PF-03654746 Pitolisant SCH-79687 Thioperamide VUF-5681

H₄	Agonists: 4-Methylhistamine α-Methylhistamine Histamine OUP-16 VUF-8430 Antagonists: JNJ-7777120 Mianserin Thioperamide Toreforant VUF-6002

Transporter
(inhibitors)

VMATs

TAAR1 inactive	Amiodarone APP AZIK Bietaserpine Deserpidine Dihydrotetrabenazine Efavirenz GBR-12935 GZ-793A Ibogaine Ketanserin Lobeline Methoxytetrabenazine NBI-98854 Reserpine Rose bengal SD-809 Tetrabenazine Vanoxerine (GBR-12909)

TAAR1 active	Amphetamine Methamphetamine MDMA Phenethylamine

Enzyme
(inhibitors)

HDC	Catechin Meciadanol Naringenin Tritoqualine

HNMT	Amodiaquine Diphenhydramine Harmaline Metoprine Quinacrine SKF-91,488 Tacrine

DAO	Aminoguanidine

Others

Precursors	L -Histidine

Cofactors	Vitamin B₆

Neuromodulation

Types

♦ Enzyme: Inducer
Inhibitor

♦ Ion channel: Opener
Blocker

♦ Miscellaneous: Precursor
Cofactor

Classes

Enzyme

see Enzyme inhibition

Ion channel

Receptor &
transporter

BA/M

Adrenergic	Adrenergic receptor agonist (α β (1 2)) Adrenergic receptor antagonist (α (1 2), β) Adrenergic reuptake inhibitor (ARI)

Dopaminergic	Dopamine receptor agonist Dopamine receptor antagonist Dopamine reuptake inhibitor (DRI)

Histaminergic	Histamine receptor agonist Histamine receptor antagonist (H₁ H₂ H₃)

Serotonergic	Serotonin receptor agonist Serotonin Receptor Antagonist (5-HT₃) Serotonin reuptake inhibitor (SRI)

GABAergic	GABA receptor agonist GABA receptor antagonist GABA reuptake inhibitor (GRI)

Glutamatergic	Glutamate receptor agonist (AMPA) Glutamate receptor antagonist (NMDA) Glutamate reuptake inhibitor

Cholinergic

Cannabinoidergic

Cannabinoid receptor agonist
Cannabinoid receptor antagonist
Endocannabinoid enhancer (eCBE)
Endocannabinoid reuptake inhibitor (eCBRI)

Opioidergic

Other

Miscellaneous

Cofactor (see Enzyme cofactors)
Precursor (see Amino acids)

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Histamine agonist

See also

External links