naphazoline

Modify Date: 2026-07-12 18:14:31

naphazoline structure	Common Name	naphazoline
	CAS Number	835-31-4	Molecular Weight	210.274
	Density	1.2±0.1 g/cm3	Boiling Point	440.5±24.0 °C at 760 mmHg
	Molecular Formula	C₁₄H₁₄N₂	Melting Point	254ºC
	MSDS	N/A	Flash Point	220.2±22.9 °C

Use of naphazoline

Naphazoline (Naphthazoline) is a potent α-adrenergic receptor agonist. Naphazoline reduces vascular hyperpermeability and promotes vasoconstriction. Naphazoline reduces the levels of inflammatory factors (TNF-α, IL-1β and IL-6), cytokines (IFN-γ and IL-4), IgE, GMCSF, and NGF。Naphazoline can be used for non-bacterial conjunctivitis research[1][2].

Name	2-(naphthalen-1-ylmethyl)-4,5-dihydro-1H-imidazole
Synonym	More Synonyms

Description	Naphazoline (Naphthazoline) is a potent α-adrenergic receptor agonist. Naphazoline reduces vascular hyperpermeability and promotes vasoconstriction. Naphazoline reduces the levels of inflammatory factors (TNF-α, IL-1β and IL-6), cytokines (IFN-γ and IL-4), IgE, GMCSF, and NGF。Naphazoline can be used for non-bacterial conjunctivitis research[1][2].
Related Catalog	Research Areas >> Cardiovascular Disease Signaling Pathways >> Immunology/Inflammation >> Interleukin Related Signaling Pathways >> GPCR/G Protein >> Adrenergic Receptor Research Areas >> Inflammation/Immunology Signaling Pathways >> Protein Tyrosine Kinase/RTK >> VEGFR
Target	TNF-α IL-1β IL-6 IL-4
In Vivo	Naphazoline (0.2 mg/kg, 10 µl per eye; IP, once) reduces histamine or antigen-induced conjunctival vascular hyperpermeability in mice, and reduces conjunctivitis in mice via effects on inflammation, NGF and VEGF[1]. Animal Model: Female wild-type BALB/c mice (4-5 weeks, 18 ± 2 g, n=8/group, allergic conjunctivitis mouse model established using histamine or an antigen (ovalbumin))[1] Dosage: 0.2 mg/mL, 10 µl per eye Administration: Intraperitoneal injection (IP), once Result: Significantly suppressed conjunctival dye leakage in mice with histamine or antigen‑induced conjunctival vascular hyperpermeability. Reduced inflammatory reactions and the levels of IL-1β, IL-6, IFN-γ, and IL-4. Reduced the levels of IgE, GMCSF, NGF and VEGF in antigen-induced conjunctival vascular hyperpermeability mice.
References	[1]. Quan L, et, al. Treatment with olopatadine and naphazoline hydrochloride reduces allergic conjunctivitis in mice through alterations in inflammation, NGF and VEGF. Mol Med Rep. 2016 Apr;13(4):3319-25. [2]. Yamaguchi I, et, al. Central and peripheral adrenergic mechanisms regulating gastric secretion in the rat. J Pharmacol Exp Ther. 1977 Oct;203(1):125-31.

Density	1.2±0.1 g/cm3
Boiling Point	440.5±24.0 °C at 760 mmHg
Melting Point	254ºC
Molecular Formula	C₁₄H₁₄N₂
Molecular Weight	210.274
Flash Point	220.2±22.9 °C
Exact Mass	210.115692
PSA	24.39000
LogP	3.88
Vapour Pressure	0.0±1.0 mmHg at 25°C
Index of Refraction	1.640
InChIKey	CNIIGCLFLJGOGP-UHFFFAOYSA-N
SMILES	c1ccc2c(CC3=NCCN3)cccc2c1
Storage condition	2-8°C

CHEMICAL IDENTIFICATION

RTECS NUMBER :: NJ4200000

CHEMICAL NAME :: 2-Imidazoline, 2-(1-naphthylmethyl)-

CAS REGISTRY NUMBER :: 835-31-4

BEILSTEIN REFERENCE NO. :: 0151864

LAST UPDATED :: 199612

DATA ITEMS CITED :: 8

MOLECULAR FORMULA :: C14-H14-N2

MOLECULAR WEIGHT :: 210.30

WISWESSER LINE NOTATION :: L66J B1- BT5M CN BUTJ

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 385 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: FEPRA7 Federation Proceedings, Federation of American Societies for Experimental Biology. (Bethesda, MD) V.1-46, 1942-87. Volume(issue)/page/year: 9,280,1950

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 270 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: ARZNAD Arzneimittel-Forschung. Drug Research. (Editio Cantor Verlag, Postfach 1255, W-7960 Aulendorf, Fed. Rep. Ger.) V.1- 1951- Volume(issue)/page/year: 29,729,1979

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 62 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: ARZNAD Arzneimittel-Forschung. Drug Research. (Editio Cantor Verlag, Postfach 1255, W-7960 Aulendorf, Fed. Rep. Ger.) V.1- 1951- Volume(issue)/page/year: 29,729,1979

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 514 mg/kg

TOXIC EFFECTS :: Behavioral - tremor Behavioral - convulsions or effect on seizure threshold

REFERENCE :: RPTOAN Russian Pharmacology and Toxicology (English Translation). Translation of FATOAO. (Euromed Pub., 33, Woodlands Rd., Surbiton, Surrey, UK) V.30- 1967- Volume(issue)/page/year: 37,198,1974

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 170 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: FEPRA7 Federation Proceedings, Federation of American Societies for Experimental Biology. (Bethesda, MD) V.1-46, 1942-87. Volume(issue)/page/year: 9,280,1950

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - rabbit

DOSE/DURATION :: 950 ug/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: FEPRA7 Federation Proceedings, Federation of American Societies for Experimental Biology. (Bethesda, MD) V.1-46, 1942-87. Volume(issue)/page/year: 9,280,1950

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Rodent - rabbit

DOSE/DURATION :: 800 ug/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: FEPRA7 Federation Proceedings, Federation of American Societies for Experimental Biology. (Bethesda, MD) V.1-46, 1942-87. Volume(issue)/page/year: 9,280,1950

TYPE OF TEST :: LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Mammal - species unspecified

DOSE/DURATION :: 10 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: AEPPAE Naunyn-Schmiedeberg's Archiv fuer Experimentelle Pathologie und Pharmakologie. (Berlin, Ger.) V.110-253, 1925-66. For publisher information, see NSAPCC. Volume(issue)/page/year: 192,141,1939

Hazard Codes	T: Toxic;
Risk Phrases	R25
Safety Phrases	45
RIDADR	UN 2811 6.1/PG 2
WGK Germany	3
RTECS	NJ4375000
HS Code	2934999090

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HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

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