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Amodiaquine dihydrochloride dihydrate

Catalog No.
histamine N-methyl transferase inhibitor
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Amodiaquine dihydrochloride dihydrate is a potent inhibitor of histamine N-methyltransferase (HNMT), with estimated Ki of 18.6 nM [1]. 

HNMT occurs ubiquitously in vertebrate species, and is widely expressed in mammalian tissues with particularly high expression levels in kidney, liver, colon, prostate, ovary, and spinal cord cells. HNMT is a cytosolic protein that is responsible for the intracellular inactivation of histamine [1]. 

Over the concentration range 10-3 ~ 10-8 M, amodiaquine was a significantly more potent inhibitor than other compounds including chlorhexidine, producing 80% inhibition on rat kidney HNMT at 10-6 M whilst the next best inhibitor at this concentration, chlorhexidine, produced only 27% inhibition. [2]. 

In mice with Propionibacterium acnes-primed and lipopolysaccharide-induced hepatitis, the subcutaneous injection of amodiaquine at 2 and 5 mg/kg significantly increased the histamine levels in the liver. Pretreatment with amodiaquine also improved the survival rate of the hepatitis mice, which was partially associated with the decrease in serum levels of aspartate aminotransferase and alanine aminotransferase [3]. 


[1]. Horton J R, Sawada K, Nishibori M, et al. Structural basis for inhibition of histamine N-methyltransferase by diverse drugs. Journal of Molecular Biology, 2005, 353(2): 334-344.

[2]. Harle D G, Baldo B A. Structural features of potent inhibitors of rat kidney histamine N-methyltransferase. Biochemical Pharmacology, 1988, 37(3): 385-388.

[3]. Yokoyama A, Mori S, Takahashi H K, et al. Effect of amodiaquine, a histamine N-methyltransferase inhibitor, on, Propionibacterium acnes and lipopolysaccharide-induced hepatitis in mice. European Journal of Pharmacology, 2007, 558(1-3): 179-184.

Chemical Properties

Physical AppearanceA solid
StorageStore at -20°C
Cas No.6398-98-7
Solubility≥70.4mg/mL in DMSO
Chemical Name4-((7-chloroquinolin-4-yl)amino)-2-((diethylamino)methyl)phenol dihydrochloride dihydrate
SDFDownload SDF
Canonical SMILESCCN(CC1=CC(NC2=C3C=CC(Cl)=CC3=NC=C2)=CC=C1O)CC.Cl.Cl.O.O
Shipping ConditionEvaluation sample solution: ship with blue ice. All other available sizes: ship with RT, or blue ice upon request.
General tipsFor obtaining a higher solubility, please warm the tube at 37°C and shake it in the ultrasonic bath for a while. Stock solution can be stored below -20°C for several months.

Quality Control

Chemical structure

Amodiaquine dihydrochloride dihydrate