WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 317195

CAS#: 91-75-8 (free base)

Description: Antazoline is a 1st generation antihistamine with anticholinergic properties used to relieve nasal congestion and in eye drops, usually in combination with naphazoline, to relieve the symptoms of allergic conjunctivitis. Antazoline is an ethylenediamine derivative with histamine H1 antagonistic and sedative properties. Antazoline antagonizes histamine H1 receptor and prevents the typical allergic symptoms caused by histamine activities on capillaries, skin, mucous membranes, and gastrointestinal and bronchial smooth muscles.

Chemical Structure

CAS# 91-75-8 (free base)

Theoretical Analysis

MedKoo Cat#: 317195
Name: Antazoline
CAS#: 91-75-8 (free base)
Chemical Formula: C17H19N3
Exact Mass: 265.1579
Molecular Weight: 265.35
Elemental Analysis: C, 76.95; H, 7.22; N, 15.84

Price and Availability

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100.0mg USD 275.0 2 Weeks
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Related CAS #: 154-68-7 (phosphate)   91-75-8 (free base)   2508-72-7 (HCl)   3131-32-6 (mesylate)   24359-81-7 (sulfate)   145178-44-5 (nitrate)  

Synonym: Antasten; Phenazoline; Antihistal; Antastan; Antistin

IUPAC/Chemical Name: N-benzyl-N-(4,5-dihydro-1H-imidazol-2-ylmethyl)aniline


InChi Code: InChI=1S/C17H19N3/c1-3-7-15(8-4-1)13-20(14-17-18-11-12-19-17)16-9-5-2-6-10-16/h1-10H,11-14H2,(H,18,19)


Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO, not in water

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 265.35 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Balsam P, Koźluk E, Peller M, Piątkowska A, Lodziński P, Kiliszek M, Kołtowski Ł, Grabowski M, Opolski G. Antazoline for termination of atrial fibrillation during the procedure of pulmonary veins isolation. Adv Med Sci. 2015 Sep;60(2):231-5. doi: 10.1016/j.advms.2015.03.002. Epub 2015 Apr 1. PubMed PMID: 25919055.

2: Piotrowski R, Kryński T, Baran J, Futyma P, Stec S, Kułakowski P. Antazoline for rapid termination of atrial fibrillation during ablation of accessory pathways. Cardiol J. 2014;21(3):299-303. doi: 10.5603/CJ.a2013.0121. Epub 2013 Aug 30. PubMed PMID: 23990192.

3: Wang R, Chu Y, Li X, Wan B, Yu T, Wang L, Hao L, Guo M. Determination of antazoline hydrochloride in rat plasma and excreta by reversed-phase ion-pair chromatography and its application to pharmacokinetics. Biomed Chromatogr. 2013 Dec;27(12):1595-602. doi: 10.1002/bmc.2965. Epub 2013 Jul 12. PubMed PMID: 23847054.

4: Li X, Chu Y, Ke Y, Wang L, Yu T, Hao L. Determination of antazoline hydrochloride in Beagle dog plasma by HPLC-UV and its application to pharmacokinetics. J Chromatogr B Analyt Technol Biomed Life Sci. 2013 Jun 15;929:97-101. doi: 10.1016/j.jchromb.2013.04.021. Epub 2013 Apr 20. PubMed PMID: 23669609.

5: Farkowski MM, Maciag A, Dabrowski R, Pytkowski M, Kowalik I, Szwed H. Clinical efficacy of antazoline in rapid cardioversion of paroxysmal atrial fibrillation--a protocol of a single center, randomized, double-blind, placebo-controlled study (the AnPAF Study). Trials. 2012 Sep 11;13:162. doi: 10.1186/1745-6215-13-162. PubMed PMID: 22967497; PubMed Central PMCID: PMC3502525.

6: Asadpour-Zeynali K, Ghavami R, Esfandiari R, Soheili-Azad P. Simultaneous determination of antazoline and naphazoline by the net analyte signal standard addition method and spectrophotometric technique. J AOAC Int. 2010 Nov-Dec;93(6):1995-2001. PubMed PMID: 21313830.

7: Hemmateenejad B, Ghavami R, Miri R, Shamsipur M. Net analyte signal-based simultaneous determination of antazoline and naphazoline using wavelength region selection by experimental design-neural networks. Talanta. 2006 Feb 15;68(4):1222-9. doi: 10.1016/j.talanta.2005.07.045. Epub 2005 Aug 24. PubMed PMID: 18970453.

8: Meloun M, Syrový T, Vrána A. The thermodynamic dissociation constants of ambroxol, antazoline, naphazoline, oxymetazoline and ranitidine by the regression analysis of spectrophotometric data. Talanta. 2004 Feb 27;62(3):511-22. doi: 10.1016/j.talanta.2003.08.027. PubMed PMID: 18969326.

9: Souri E, Amanlou M, Farsam H, Afshari A. A rapid derivative spectrophotometric method for simultaneous determination of naphazoline and antazoline in eye drops. Chem Pharm Bull (Tokyo). 2006 Jan;54(1):119-22. PubMed PMID: 16394564.

10: Rojsitthisak P, Wichitnithad W, Pipitharome O, Sanphanya K, Thanawattanawanich P. Simple HPLC determination of benzalkonium chloride in ophthalmic formulations containing antazoline and tetrahydrozoline. PDA J Pharm Sci Technol. 2005 Sep-Oct;59(5):332-7. PubMed PMID: 16316068


100.0mg / USD 275.0