Bilastine

Antihistamine medication

Pharmaceutical compound

Bilastine

Clinical data
Trade names| Blexten, others
Pregnancy
category|

* AU: B3[1][2]

Routes of
administration| By mouth
Drug class| Antihistamine
ATC code|

* R06AX29 (WHO) S01GX13 (WHO)

Legal status
Legal status|

* AU: S2 (Pharmacy medicine)[3]
* CA: ℞-only[4]
* NZ: S2 (Pharmacy Only)[5]

Pharmacokinetic data
Bioavailability| 61%[1]
Protein binding| 84-90% binding to plasma proteins[1]
Metabolism| Not significantly metabolised[1]
Onset of action| 1 hour (Allertine)[1]
Elimination half-life| 14.5 hours[1]
Duration of action| 24 hours (Allertine)[1]
Excretion| 95% in urine and faeces[1]
Identifiers

IUPAC name

* 2-[4-(2-{4-[1-(2-Ethoxyethyl)-1H-benzimidazol-2-yl]-1-piperidinyl}ethyl)phenyl]-2-methylpropanoic acid

CAS Number|

* 202189-78-4 Y

PubChem CID|

* 185460

DrugBank|

* DB11591

ChemSpider|

* 161234 Y

UNII|

* PA1123N395

KEGG|

* D09570

ChEMBL|

* ChEMBL1742423 Y

CompTox Dashboard (EPA)|

* DTXSID5057678

ECHA InfoCard| 100.260.016
Chemical and physical data
Formula| C28H37N3O3
Molar mass| 463.622 g·mol−1
3D model (JSmol)|

* Interactive image

SMILES

* O=C(O)C(c1ccc(cc1)CCN4CCC(c2nc3ccccc3n2CCOCC)CC4)(C)C

InChI

* InChI=1S/C28H37N3O3/c1-4-34-20-19-31-25-8-6-5-7-24(25)29-26(31)22-14-17-30(18-15-22)16-13-21-9-11-23(12-10-21)28(2,3)27(32)33/h5-12,22H,4,13-20H2,1-3H3,(H,32,33) Y

* Key:ACCMWZWAEFYUGZ-UHFFFAOYSA-N Y

NY (what is this?) (verify)

Bilastine is an antihistamine medication used to treat hives (urticaria), allergic rhinitis and itchy inflamed eyes (allergic conjunctivitis) caused by an allergy.[6] It is a second-generation antihistamine and takes effect by selectively inhibiting the histamine H1 receptor, preventing these allergic reactions.[7] Bilastine has an effectiveness similar to cetirizine, fexofenadine, and desloratadine.[8]

Bilastine was discovered by the Spanish firm FAES Farma[9] and received its first approval in the European Union in 2010 for the symptomatic treatment of allergic rhinoconjunctivitis and urticaria.[10] It is also approved in Canada and Australia. As of 2023, it remained unapproved for any use in the United States,[11] although Hikma Pharmaceuticals had agreed in 2021 to begin the FDA approval process.[12]

Evidence has shown that bilastine is effective in treating skin and eye symptoms of allergic reactions, improving patient's quality of life.[8][13] Bilastine meets the treatment criteria for allergic rhinitis, as published by the European Academy of Allergy and Clinical Immunology (EAACI) and the Allergic Rhinitis and its Impact on Asthma (ARIA) initiative.[13]

## Medical uses

[edit]

### Allergic rhinoconjunctivitis

[edit]

The clinical effectiveness of bilastine in treating allergic rhinitis (AR) and urticaria has been evaluated in 10 clinical trials, involving over 4,600 patients. In each study, bilastine was compared with a placebo and another second-generation antihistamine with established efficacy (active comparator).

#### Allergic rhinitis

[edit]

The studies on SAR were double-blind, placebo-controlled, parallel-group involving male and female patients over 12 year of age with symptomatic disease at the beginning of the study. Nasal symptoms (sneezing, rhinorrhea, nasal itching, and congestion) were assessed both before treatment and during treatment period on a daily basis. Non-nasal symptoms (itchy eye, watery eye, itchy ear, and palate) were also assessed according to a 0–3 scale, so that the Total Symptoms Score (TSS) and other related parameters could clearly reflect daily evolution of SAR in each patient and treatment group. Parameters such as quality of life and discomfort were also assessed, and in the same way the type and frequency of adverse effects, tolerability and general safety of treatment were registered. In this SAR studies the daily oral administration during 14 days of bilastine proves to have the same efficacy as the administration of cetirizine and desloratadine.[14]

### Urticaria

[edit]

A review article evaluated data from trials which detailed the efficacy of bilastine in skin models and urticaria to assess whether bilastine has an optimal profile for updosing in urticaria. The authors concluded that bilastine has an excellent profile for both efficacy and safety, although there is a need for controlled clinical trials to compare the efficacy of bilastine in a real-life updosing study in patients with urticaria, paying special attention to itch control.[15]

### Dosage and administration

[edit]

Bilastine comes as a tablet taken by mouth (PO) and it is supposed to be swallowed whole with water. Bilastine should not be given with, or within 1 hour before or 2 hours after, food as it may reduce its effectiveness. Australian dosing guidelines for Allertine give a maximum dose of 20 mg (one tablet) daily as needed (PRN).[16] Dose changes are not required for hepatic or renal impairment.[16]

While the onset of its effects vary between formulations, bilastine generally takes effect within 30–60 minutes.[8] It should be taken only by children older than 4 years and adults, or anyone over 12 years for Allertine.[13][16]

## Side effects

[edit]

Toxicity of bilastine investigated in preclinical toxicology studies in mice, rats and dogs after oral and intravenous administration showed no mortality observed after oral administration of massive doses. After intravenous administration, LD50 (lethal dose for 50% of animals) values were 33 and 45–75 mg/kg in mice and rats, respectively. No signs of toxicity were observed in any organ after bilastine massive overdosing, either orally (in mice, rats and dogs), or intravenously (in rats and dogs) during 4 weeks. No effects on fertility, no teratogenic or mutagenic effects, and no apparent carcinogenic potential were seen in the studies carried out in rats, mice and rabbits.[17]

In clinical research, bilastine has proven to be well tolerated, with an adverse events profile similar to that of placebo in healthy volunteers, patients with AR and with chronic idiopathic urticaria. Although the tolerance profile of bilastine and levocetirizine or desloratadine were very similar,[18] bilastine was markedly better tolerated than cetirizine in a clinical assay in SAR, with fewer adverse events in the bilastine group. No anticholinergic adverse events were observed in the clinical trials with bilastine. No serious adverse events were reported during the research and there were no clinically significant changes in vital signs, electrocardiography (ECG) or laboratory tests. Pharmacokinetic/pharmacodynamic profiles and studies in special populations indicate that dose adjustment of bilastine is not necessary in elderly patients or in chronic liver disease or chronic kidney disease.

### Cardiac safety

[edit]

The clinical cardiac safety of bilastine has been assessed in many clinical trials performed[18][19][20] (more than 3,500 patients treated with bilastine) and in a phase I study (Thorough QT/QTc study) designed according to the ICH E14 guidance and the most demanding requirements from the Food and Drug Administration (FDA).[21] When electrocardiograms (ECG) data from all of the phase I studies are analysed, no significant alteration is appreciated in any of the parameters after administering bilastine at single doses (up to 11 times the therapeutic dose), nor at multiple doses (up to 10 times the therapeutic dose). Phase II and III studies on AR and urticaria (including the open-label extension phase of 12 months) do not reveal alterations in the ECG, nor significant prolongations of the QTc interval after administration of bilastine 20 mg.

The Thorough QT/QTc study was designed to assess the effect on the QT/QTc interval, both of the therapeutic dose (20 mg) and 100 mg of bilastine, but also the coadministration of the therapeutic dose with usual doses of ketoconazol (400 mg/day), a metabolism inhibitor and a P-gP dependent transport system. It was verified that bilastine 20 and 100 mg administered during 4 days, does not induce significant changes in the QT/QTc interval duration in any of the individuals.[20][21] Likewise, coadministration of bilastine 20 mg and ketoconazol 400 mg does not produce any significant prolongation of the QT/QTc interval attributable to bilastine.

## Interactions

[edit]

Preclinical data suggest the possibility of interactions between bilastine and drugs or food that are inhibitors or inducers of the P-glycoproteins. Coadministration of bilastine and grapefruit juice (a known P-glycoprotein-mediated drug transport activator) significantly reduced bilastine systemic exposure.[22] This interaction is due to the known effect of grapefruit flavonoids on intestinal transporter systems such as P-glycoproteins and organic anion transporting peptide (OATP).[23]

## Pharmacology

[edit]

### Pharmacodynamics

[edit]

Bilastine binds to guinea-pig cerebellar histamine H1-receptors (Ki=44 nM) and to human recombinant histamine H1-receptors (Ki=64 nM) with an affinity comparable to that of astemizole and diphenhydramine, and superior than that of cetirizine by three-fold and fexofenadine by five-fold (Corcóstegui). In different murine models, bilastine by oral route, antagonizes the effects of histamine in a dose-dependent manner, with potency similar to that of cetirizine and between 5.5 and 10 times greater than that of fexofenadine.[24]

Preclinical investigations demonstrate the affinity and specificity of bilastine for histamine H1-receptors compared with other histamine receptors subtypes and other 30 receptors from different amines. In vivo experimentation confirmed the antihistaminic and antiallergic activity, which was at least comparable to that of other second-generation H1-antihistamines such as cetirizine.[8][14]

### Pharmacokinetics

[edit]

#### Absorption

[edit]

Bilastine is most quickly absorbed with the absence of food, and reaches a mean peak plasma concentration of 220 ng/mL approximately 1 h after both single and multiple dosing.[25] Absorption is reduced by a high-fat breakfast or fruit juice, and the estimated global oral bioavailability is approximately 60%.[25] Bilastine has linear pharmacokinetics in the 2.5–220 mg dose range in healthy adult subjects without evidence of accumulation after 14 days of treatment.[25]

#### Distribution

[edit]

Bilastine distribution has an apparent volume of distribution of 1.29 L/kg, and has an elimination half-life of 14.5 h and plasma protein binding of 84–90%.[26]

Bilastine is a peripherally selective drug, and this is thought to be due to limited brain uptake caused by binding to P-glycoprotein.[27][28]

#### Metabolism

[edit]

Bilastine is not significantly metabolized in humans and is largely eliminated unchanged both in urine and feces – a third and two thirds of the administered dose, respectively, according to a Phase I mass-balance study with radiolabeled bilastine.[29] Bilastine does not readily cross the blood brain barrier and is not metabolized by the liver.[25] Ninety six percent of the administered dose is eliminated within 24 hours.[25]

In relation to its antihistamine effect, oral doses of 20 mg daily of bilastine, measured as skin wheal-and-flare surface areas for 24 h, bilastine is capable of inhibiting 50% of the surface areas – throughout the whole administration interval.[25]

## Chemistry

[edit]

Bilastine, or 2-[4-[2-[4-[1-(2-ethoxyethyl) benzimidazol-2-yl] piperidin-1-yl] ethyl] phenyl]-2-methylpropionic acid, is a molecule with a molecular weight of 463.6 daltons and a chemical structure similar to piperidinyl-benzimidazole.[25] Bilastine can be therefore classified into the same chemical group as many of the new antihistamines on the market, although it is not structurally derived, nor is it a metabolite or enantiomer of any of them, but an original molecule designed with the intent of fulfilling all the requirements of a second-generation antihistamine.[25]

### Research

[edit]

Clinical studies using different dosages were done on histamine-induced wheal and flare reaction over a 24-h period, compared with a single 10 mg oral dose of cetirizine.[25] The results of this research indicated that bilastine was at least as efficient as cetirizine in reducing histamine-mediated effects in healthy volunteers. Notably, 20 and 50 mg of bilastine reduced the wheal and flare reaction faster than cetirizine.[25]

## References

[edit]

1. ^ a b c d e f g h "Australian Product Information - Allertine (Bilastine) tablet". Therapeutic Goods Administration. 27 April 2022. Archived from the original on 13 September 2022. Retrieved 13 September 2022.
2. ^ "Updates to the Prescribing Medicines in Pregnancy database". Therapeutic Goods Administration (TGA). 21 December 2022. Archived from the original on 3 April 2022. Retrieved 2 January 2023.
3. ^ "Public summary - ALLERTINE bilastine 20 mg tablet blister pack". Therapeutic Goods Administration. 27 April 2022. Archived from the original on 7 December 2022. Retrieved 13 September 2022.
4. ^ "Health Canada New Drug Authorizations: 2016 Highlights". Health Canada. 14 March 2017. Retrieved 7 April 2024.
5. ^ "bilastine classification". (mcc). Retrieved 17 August 2024.
6. ^ "Ilaxten 20 mg tablets - Summary of Product Characteristics (SmPC)". (emc). Archived from the original on 24 June 2021. Retrieved 16 June 2021.
7. ^ Corcóstegui R, Labeaga L, Innerárity A, Berisa A, Orjales A (2005). "Preclinical pharmacology of bilastine, a new selective histamine H1 receptor antagonist: receptor selectivity and in vitro antihistaminic activity". Drugs in R&D. 6 (6): 371–384\. doi:10.2165/00126839-200506060-00005. PMID 16274260. S2CID 23407135.
8. ^ a b c d Jáuregui I, Bartra J, del Cuvillo A, Dávila I, Ferrer M, Montoro J, et al. (2011). "Bilastine and quality of life". Journal of Investigational Allergology & Clinical Immunology. 21 (Suppl 3): 16–23\. PMID 22185046.
9. ^ Ding HX, Liu KK, Sakya SM, Flick AC, O'Donnell CJ (June 2013). "Synthetic approaches to the 2011 new drugs". Bioorganic & Medicinal Chemistry. 21 (11): 2795–2825\. doi:10.1016/j.bmc.2013.02.061. PMID 23623674.
10. ^ Church MK, Tiongco-Recto M, Ridolo E, Novák Z (March 2020). "Bilastine: a lifetime companion for the treatment of allergies". Current Medical Research and Opinion. 36 (3): 445–454\. doi:10.1080/03007995.2019.1681134. PMID 31612732.
11. ^ Bilastine Approval Status Archived 2023-08-27 at the Wayback Machine, drugs.com
12. ^ "Hikma and FAES Farma enter into exclusive licensing agreement for the commercialisation of Bilastine tablets in the US" (Press release). Hikma Pharmaceuticals. 20 Sep 2021. Retrieved 25 Aug 2024.
13. ^ a b c Bousquet J, Ansótegui I, Canonica GW, Zuberbier T, Baena-Cagnani CE, Bachert C, et al. (January 2012). "Establishing the place in therapy of bilastine in the treatment of allergic rhinitis according to ARIA: evidence review". Current Medical Research and Opinion. 28 (1): 131–139\. doi:10.1185/03007995.2011.648263. PMID 22149770. S2CID 8429174.
14. ^ a b Bachert C, Kuna P, Sanquer F, Ivan P, Dimitrov V, Gorina MM, et al. (Bilastine International Working Group) (January 2009). "Comparison of the efficacy and safety of bilastine 20 mg vs desloratadine 5 mg in seasonal allergic rhinitis patients". Allergy. 64 (1): 158–165\. doi:10.1111/j.1398-9995.2008.01813.x. PMID 19132976. S2CID 20109223.
15. ^ Church MK, Labeaga L (September 2017). "Bilastine: a new H1 -antihistamine with an optimal profile for updosing in urticaria". Journal of the European Academy of Dermatology and Venereology. 31 (9): 1447–1452\. doi:10.1111/jdv.14305. PMID 28467671. S2CID 35712759.
16. ^ a b c "Allertine (bilastine)". MIMS. Archived from the original on 28 November 2023. Retrieved 13 September 2022.
17. ^ Horak F, Zieglmayer P, Zieglmayer R, Lemell P (May 2010). "The effects of bilastine compared with cetirizine, fexofenadine, and placebo on allergen-induced nasal and ocular symptoms in patients exposed to aeroallergen in the Vienna Challenge Chamber". Inflammation Research. 59 (5): 391–398\. doi:10.1007/s00011-009-0117-4. PMID 19943178. S2CID 30289994.
18. ^ a b Kuna P, Bachert C, Nowacki Z, van Cauwenberge P, Agache I, Fouquert L, et al. (Bilastine International Working Group) (September 2009). "Efficacy and safety of bilastine 20 mg compared with cetirizine 10 mg and placebo for the symptomatic treatment of seasonal allergic rhinitis: a randomized, double-blind, parallel-group study". Clinical and Experimental Allergy. 39 (9): 1338–1347\. doi:10.1111/j.1365-2222.2009.03257.x. PMID 19438584. S2CID 42461412.
19. ^ Zuberbier T, Oanta A, Bogacka E, Medina I, Wesel F, Uhl P, et al. (April 2010). "Comparison of the efficacy and safety of bilastine 20 mg vs levocetirizine 5 mg for the treatment of chronic idiopathic urticaria: a multi-centre, double-blind, randomized, placebo-controlled study". Allergy. 65 (4): 516–528\. doi:10.1111/j.1398-9995.2009.02217.x. PMID 19860762. S2CID 24312427.
20. ^ a b Tyl B, Kabbaj M, Azzam S, Sologuren A, Valiente R, Reinbolt E, et al. (June 2012). "Lack of significant effect of bilastine administered at therapeutic and supratherapeutic doses and concomitantly with ketoconazole on ventricular repolarization: results of a thorough QT study (TQTS) with QT-concentration analysis". Journal of Clinical Pharmacology. 52 (6): 893–903\. doi:10.1177/0091270011407191. PMID 21642470. S2CID 11649589.
21. ^ a b Graff C, Struijk JJ, Kanters JK, Andersen MP, Toft E, Tyl B (May 2012). "Effects of bilastine on T-wave morphology and the QTc interval: a randomized, double-blind, placebo-controlled, thorough QTc study". Clinical Drug Investigation. 32 (5): 339–351\. doi:10.2165/11599270-000000000-00000. PMID 22393898. S2CID 22766684.
22. ^ Bachert C, Kuna P, Zuberbier T (1 June 2010). "Bilastine in allergic rhinoconjunctivitis and urticaria". Allergy. 65: 1–13\. doi:10.1111/j.1398-9995.2010.02404.x. S2CID 52228628.
23. ^ Bailey DG (November 2010). "Fruit juice inhibition of uptake transport: a new type of food-drug interaction". British Journal of Clinical Pharmacology. 70 (5): 645–655\. doi:10.1111/j.1365-2125.2010.03722.x. PMC 2997304. PMID 21039758.
24. ^ Corcóstegui R, Labeaga L, Innerárity A, Berisa A, Orjales A (2005). "Preclinical pharmacology of bilastine, a new selective histamine H1 receptor antagonist: receptor selectivity and in vitro antihistaminic activity". Drugs in R&D. 6 (6): 371–384\. doi:10.2165/00126839-200506060-00005. PMID 16274260. S2CID 23407135.
25. ^ a b c d e f g h i j Jáuregui I, García-Lirio E, Soriano AM, Gamboa PM, Antépara I (January 2012). "An overview of the novel H1-antihistamine bilastine in allergic rhinitis and urticaria". Expert Review of Clinical Immunology. 8 (1): 33–41\. doi:10.1586/eci.11.87. PMID 22149338. S2CID 207209051.
26. ^ Jauregizar N, de la Fuente L, Lucero ML, Sologuren A, Leal N, Rodríguez M (1 August 2009). "Pharmacokinetic-pharmacodynamic modelling of the antihistaminic (H1) effect of bilastine". Clinical Pharmacokinetics. 48 (8): 543–554\. doi:10.2165/11317180-000000000-00000. PMID 19705924. S2CID 552051.
27. ^ Church MK (2021). "Antihistamines". Urticaria and Angioedema. Springer International Publishing. pp. 153–165\. doi:10.1007/978-3-030-84574-2_11. ISBN 978-3-030-84573-5. S2CID 239944965.
28. ^ Montoro J, Mullol J, Dávila I, Ferrer M, Sastre J, Bartra J, et al. (2011). "Bilastine and the central nervous system". Journal of Investigational Allergology & Clinical Immunology. 21 (Suppl 3): 9–15\. PMID 22185045.
29. ^ "Human mass balance with [14 C]-bilastine following oral administration to healthy volunteers". Basic Clin. Pharmacol. Toxicol. 105. 2009.

* v
* t
* e

Antihistamines (R06)

Benzimidazoles (*)|

* Astemizole
* Azelastine
* Bilastine
* Emedastine
* Mizolastine
* Talastine

Diarylmethanes|

* Diarylmethoxyalkylamines: Bromazine (bromodiphenhydramine)
* Carbinoxamine
* Chlorphenoxamine
* Clemastine
* Diphenhydramine (+naproxen)
* Diphenylpyraline
* Doxylamine
* Ebastine
* Orphenadrine

* Diphenylmethanolpiperidines: Fexofenadine
* Terfenadine

* Diphenylmethylpiperazines: Buclizine
* Cetirizine
* Levocetirizine
* Chlorcyclizine
* Cinnarizine
* Cyclizine
* Etodroxizine
* Hydroxyzine
* Meclizine
* Oxatomide

* Phenylpyridinylpropanamines: Brompheniramine
* Chlorphenamine
* Dexbrompheniramine (+pseudoephedrine)
* Dexchlorpheniramine (+betamethasone)
* Pheniramine

* Others: Acrivastine
* Bamipine
* Dimetindene
* Phenyltoloxamine
* Pyrrobutamine
* Quifenadine
* Triprolidine

Ethylenediamines|

* Antazoline
* Chloropyramine
* Histapyrrodine
* Mepyramine (pyrilamine)
* Methapyrilene
* Phenbenzamine
* Thenalidine
* Tripelennamine (pyribenzamine)

Tricyclics|

* Dibenzocycloheptenes: Antidepressants (e.g., amitriptyline)
* Azatadine
* Cyproheptadine
* Deptropine
* Desloratadine
* Ketotifen
* Loratadine
* Rupatadine

* Phenothiazines: Alimemazine
* Fenethazine
* Hydroxyethylpromethazine
* Isothipendyl
* Mequitazine
* Methdilazine
* Oxomemazine
* Promethazine

* Others: Antidepressants (e.g., doxepin, mirtazapine, trimipramine)
* Epinastine
* Latrepirdine
* Mebhydrolin
* Olopatadine
* Perlapine
* Phenindamine
* Pimethixene

Others|

* Phenylpiperazines: Antidepressants (e.g., trazodone)
* Phenbenzamine

For topical use|

* Bamipine
* Chloropyramine
* Chlorphenoxamine
* Clemastine
* Dimetindene
* Diphenhydramine
* Doxepin
* Isothipendyl
* Mepyramine (pyrilamine)
* Promethazine

* v
* t
* e

Histamine receptor modulators

H1|

| Agonists|

* 2-Pyridylethylamine
* Betahistine
* Histamine
* HTMT
* L-Histidine
* 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
* Cloperastine
* 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
* Perlapine
* 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 (phencarol)
* Rocastine
* Rupatadine
* Setastine
* Sequifenadine (bicarphen)
* Talastine
* Temelastine
* Terfenadine
* Vapitadine
* Zepastine

* Others: Atypical antipsychotics (e.g., aripiprazole, asenapine, brexpiprazole, brilaroxazine, clozapine, iloperidone, olanzapine, paliperidone, quetiapine, risperidone, ziprasidone, zotepine)
* Phenylpiperazine antidepressants (e.g., hydroxynefazodone, nefazodone, trazodone, triazoledione)
* 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: Azanator
* Belarizine
* Elbanizine
* Flotrenizine
* GSK1004723
* Napactadine
* Tagorizine
* Trelnarizine
* Trenizine

H2|

| Agonists|

* Amthamine
* Betazole
* Dimaprit
* Histamine
* HTMT
* Impromidine
* L-Histidine
* 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
* L-Histidine
* Methimepip
* Proxyfan

|

Antagonists|

* A-349821
* A-423579
* ABT-239
* ABT-652
* AZD5213
* Bavisant
* Betahistine
* Burimamide
* Ciproxifan
* Clobenpropit
* Conessine
* Enerisant
* GSK-189254
* Impentamine
* Iodophenpropit
* Irdabisant
* JNJ-5207852
* NNC 38-1049
* PF-03654746
* Pitolisant
* SCH-79687
* Thioperamide
* VUF-5681

H4|

| Agonists|

* 4-Methylhistamine
* α-Methylhistamine
* Histamine
* L-Histidine
* OUP-16
* VUF-8430

|

Antagonists|

* JNJ-7777120
* Mianserin
* Seliforant
* Thioperamide
* Toreforant
* VUF-6002

See also
Receptor/signaling modulators
Monoamine metabolism modulators
Monoamine reuptake inhibitors

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* Medicine

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