Flumazenil

Modify Date: 2026-07-01 20:02:04

Flumazenil structure	Common Name	Flumazenil
	CAS Number	78755-81-4	Molecular Weight	303.288
	Density	1.4±0.1 g/cm3	Boiling Point	528.0±50.0 °C at 760 mmHg
	Molecular Formula	C₁₅H₁₄FN₃O₃	Melting Point	201-203°C
	MSDS	Chinese USA	Flash Point	273.1±30.1 °C

Use of Flumazenil

Flumazenil is a competitive GABAA receptor antagonist, used in the treatment of benzodiazepine overdoses.

This table lists Chinese names, IUPAC names and various aliases of this chemical substance.

Name	flumazenil
Synonym	More Synonyms

This table contains bioactivity, target information and biological‑assay experimental data of this compound.

Description	Flumazenil is a competitive GABAA receptor antagonist, used in the treatment of benzodiazepine overdoses.
Related Catalog	Signaling Pathways >> Membrane Transporter/Ion Channel >> GABA Receptor Signaling Pathways >> Neuronal Signaling >> GABA Receptor Research Areas >> Neurological Disease
In Vivo	Flumazenil interacts at the central benzodiazepine receptor to antagonize or reverse the behavioral, neurologic, and electrophysiologic effects of benzodiazepine agonists and inverse agonists. Flumazenil is of some benefit in hepatic encephalopathy, but until well-designed clinical trials are conducted, hepatic encephalopathy must be considered an investigational indication for flumazenil. Flumazenil has been shown to reverse sedation caused by intoxication with benzodiazepines alone or benzodiazepines in combination with other agents, but it should not be used when cyclic antidepressant intoxication is suspected[1]. Flumazenil (1 mg/kg) induces a strong anxiolytic effect in BALB/c mice tested in the elevated plus maze and light/dark test[2]. Flumazenil (10 mg/kg) effectively prevents the reduction produced by allopregnanolone in rats[3]. Flumazenil (5-20 mg/kg) antagonizes the anticonvulsant and adverse effects of diazepam but not GYKI 52466 in mice. Flumazenil slightly reduces the anticonvulsant activity of NBQX in the MES model but not in the PTZ test[4]. Flumazenil (3.0 mg/kg) blocks the changes withdrawal from chronic ethanol treatment, which leads to a decrease in open arm time and percent open arm entries[5].
Animal Admin	Flumazenil is administered intraperitoneally in a volume of 10 mL/kg body weight 20 min before experimental testing. Two polyvinylchloride boxes (20×20×14 cm) covered with Plexiglas are connected by an opaque plastic tunnel (5×7×10 cm). One of these boxes is darkened. A light from a 100-W desk lamp 40 cm above the other box provided the only room illumination. This light level (300 lux) is chosen in order to avoid strain differences to be detected on time in the lit box (a measure of anxiety behaviour) in control animals. Indeed, in previous experiments, the BALB/c mice differ from C57BL/6 only in the high light condition. The subjects are individually tested in 5-min sessions between 1400 and 1700 hours. Mice are placed in the lit box to start the test session. The time spent in the lit box and the number of transitions from the dark box to the lit one are recorded after the first entry in the tunnel.
References	[1]. Hoffman EJ, et al. Flumazenil: a benzodiazepine antagonist. Clin Pharm. 1993 Sep;12(9):641-56; quiz 699-701. [2]. Belzung C, et al. Flumazenil induces benzodiazepine partial agonist-like effects in BALB/c but not C57BL/6 mice. Psychopharmacology (Berl). 2000 Jan;148(1):24-32. [3]. Fernandez-Guasti A, et al. Flumazenil blocks the anxiolytic action of allopregnanolone. Eur J Pharmacol. 1995 Jul 25;281(1):113-5. [4]. Loscher W, et al. Effects of the non-NMDA antagonists NBQX and the 2,3-benzodiazepine GYKI 52466 on different seizure types in mice: comparison with diazepam and interactions with flumazenil. Br J Pharmacol. 1994 Dec;113(4):1349-57. [5]. Moy SS, et al. Flumazenil blockade of anxiety following ethanol withdrawal in rats. Psychopharmacology (Berl). 1997 Jun;131(4):354-60.

This table shows physicochemical parameters including melting point, boiling point, density, solubility and optical rotation. Missing data is marked as N/A.

Density	1.4±0.1 g/cm3
Boiling Point	528.0±50.0 °C at 760 mmHg
Melting Point	201-203°C
Molecular Formula	C₁₅H₁₄FN₃O₃
Molecular Weight	303.288
Flash Point	273.1±30.1 °C
Exact Mass	303.101929
PSA	64.43000
LogP	0.67
Appearance of Characters	solid \| white
Vapour Pressure	0.0±1.4 mmHg at 25°C
Index of Refraction	1.634
InChIKey	OFBIFZUFASYYRE-UHFFFAOYSA-N
SMILES	CCOC(=O)c1ncn2c1CN(C)C(=O)c1cc(F)ccc1-2
Storage condition	2-8°C
Water Solubility	128 mg/L

This table summarizes toxicological test data, acute & chronic toxicity and ecological hazard parameters for this chemical.

CHEMICAL IDENTIFICATION

RTECS NUMBER :: NI2922170

CHEMICAL NAME :: 4H-Imidazo(1,5-a)(1,4)benzodiazepine-3-carboxylic acid, 8-fluoro-5,6-dihydro-5-methyl-6- oxo-, ethyl ester

CAS REGISTRY NUMBER :: 78755-81-4

LAST UPDATED :: 199612

DATA ITEMS CITED :: 15

MOLECULAR FORMULA :: C15-H14-F-N3-O3

MOLECULAR WEIGHT :: 303.32

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Human - man

DOSE/DURATION :: 5700 ng/kg/C

TOXIC EFFECTS :: Cardiac - cardiomyopathy including infarction Cardiac - arrhythmias (including changes in conduction) Cardiac - change in rate

REFERENCE :: BMJOAE British Medical Journal. (British Medical Assoc., BMA House, Tavistock Sq., London WC1H 9JR, UK) V.1- 1857- Volume(issue)/page/year: 304,1415,1992

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Human - woman

DOSE/DURATION :: 2 mg/kg/2D-I

TOXIC EFFECTS :: Behavioral - hallucinations, distorted perceptions Behavioral - excitement Behavioral - aggression

REFERENCE :: LANCAO Lancet. (7 Adam St., London WC2N 6AD, UK) V.1- 1823- Volume(issue)/page/year: 339,488,1992

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Human - woman

DOSE/DURATION :: 4 ug/kg

TOXIC EFFECTS :: Behavioral - convulsions or effect on seizure threshold Cardiac - EKG changes not diagnostic of specified effects Cardiac - pulse rate increase, without fall in BP

REFERENCE :: PECAE5 Pediatric Emergency Care. (Williams & Wilkins, 428 E. Preston St., Baltimore, MD 21202) V.1- 1985- Volume(issue)/page/year: 11,186,1995

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

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 4200 mg/kg

TOXIC EFFECTS :: Behavioral - somnolence (general depressed activity) Behavioral - tremor Behavioral - rigidity (including catalepsy)

REFERENCE :: JTCEEM Journal de Toxicologie Clinique et Experimentale. (SPPIF, B.P.22, F-41353 Vineuil, France) V.5- 1985- Volume(issue)/page/year: 7,223,1987

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

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 1360 mg/kg

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

REFERENCE :: DRFUD4 Drugs of the Future. (J.R. Prous, S.A., Apartado de Correos 540, 08080 Barcelona, Spain) V.1- 1975/76- Volume(issue)/page/year: 7,402,1982

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

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 85 mg/kg

TOXIC EFFECTS :: Behavioral - convulsions or effect on seizure threshold Behavioral - rigidity (including catalepsy)

REFERENCE :: JTCEEM Journal de Toxicologie Clinique et Experimentale. (SPPIF, B.P.22, F-41353 Vineuil, France) V.5- 1985- Volume(issue)/page/year: 7,223,1987

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

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 1300 mg/kg

TOXIC EFFECTS :: Behavioral - somnolence (general depressed activity) Behavioral - tremor Behavioral - rigidity (including catalepsy)

REFERENCE :: JTCEEM Journal de Toxicologie Clinique et Experimentale. (SPPIF, B.P.22, F-41353 Vineuil, France) V.5- 1985- Volume(issue)/page/year: 7,223,1987

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

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 4 gm/kg

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

REFERENCE :: DRFUD4 Drugs of the Future. (J.R. Prous, S.A., Apartado de Correos 540, 08080 Barcelona, Spain) V.1- 1975/76- Volume(issue)/page/year: 7,402,1982

TYPE OF TEST :: LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: >1 gm/kg

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

REFERENCE :: IYKEDH Iyakuhin Kenkyu. Study of Medical Supplies. (Nippon Koteisho Kyokai, 12-15, 2-chome, Shibuya, Shibuya-ku, Tokyo 150, Japan) V.1- 1970- Volume(issue)/page/year: 23,201,1992

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

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 143 mg/kg

TOXIC EFFECTS :: Behavioral - convulsions or effect on seizure threshold Behavioral - rigidity (including catalepsy)

REFERENCE :: JTCEEM Journal de Toxicologie Clinique et Experimentale. (SPPIF, B.P.22, F-41353 Vineuil, France) V.5- 1985- Volume(issue)/page/year: 7,223,1987

TYPE OF TEST :: LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Mammal - dog

DOSE/DURATION :: >640 mg/kg

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

REFERENCE :: IYKEDH Iyakuhin Kenkyu. Study of Medical Supplies. (Nippon Koteisho Kyokai, 12-15, 2-chome, Shibuya, Shibuya-ku, Tokyo 150, Japan) V.1- 1970- Volume(issue)/page/year: 23,201,1992

TYPE OF TEST :: LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :: Intravenous

SPECIES OBSERVED :: Mammal - dog

DOSE/DURATION :: >30 mg/kg

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

REFERENCE :: IYKEDH Iyakuhin Kenkyu. Study of Medical Supplies. (Nippon Koteisho Kyokai, 12-15, 2-chome, Shibuya, Shibuya-ku, Tokyo 150, Japan) V.1- 1970- Volume(issue)/page/year: 23,201,1992

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

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rabbit

DOSE/DURATION :: 2 gm/kg

TOXIC EFFECTS :: Behavioral - somnolence (general depressed activity) Behavioral - tremor Behavioral - rigidity (including catalepsy)

REFERENCE :: JTCEEM Journal de Toxicologie Clinique et Experimentale. (SPPIF, B.P.22, F-41353 Vineuil, France) V.5- 1985- Volume(issue)/page/year: 7,223,1987 ** REPRODUCTIVE DATA **

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Subcutaneous

DOSE :: 21 mg/kg

SEX/DURATION :: female 14-20 day(s) after conception

TOXIC EFFECTS :: Reproductive - Effects on Newborn - behavioral

REFERENCE :: PNPPD7 Progress in Neuro-Psychopharmacology and Biological Psychiatry. (Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, NY 10523) V.6- 1982- Volume(issue)/page/year: 17,151,1993

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Subcutaneous

DOSE :: 220 mg/kg

SEX/DURATION :: female 11-21 day(s) after conception

TOXIC EFFECTS :: Reproductive - Effects on Newborn - behavioral

REFERENCE :: GEPHDP General Pharmacology. (Pergamon Press Inc., Maxwell House, Fairview Park, Elmsford, NY 10523) V.6- 1975- Volume(issue)/page/year: 22,43,1991

This table covers safety warnings, protective measures, incompatible substances and disposal guidelines for this compound.

Personal Protective Equipment	Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter
Hazard Codes	Xi
Risk Phrases	R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Phrases	S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice . S27:Take off immediately all contaminated clothing . S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
RIDADR	NONH for all modes of transport
WGK Germany	2
RTECS	NI2922170
HS Code	2933990090

This table presents publicly reported synthetic routes, reaction conditions, reactants and product information of the compound.

This table lists upstream starting materials and downstream derivative products related to this chemical.

Precursor 9
CAS#:428507-28-2 (E)-(dimethylam... CAS#:193693-31-1 2-chloro-7-fluo... CAS#:999-97-3 Hexamethyldisilazane CAS#:99-97-8 4,N,N-Trimethyl...
CAS#:3400-09-7 Dichloramine CAS#:2999-46-4 Ethyl isocyanoa... CAS#:865-47-4 potassium t-butoxide CAS#:78755-80-3 7-Fluoro-3,4-di...
CAS#:658075-93-5 8-amino-5,6-dih...
DownStream 2
CAS#:133368-73-7 3'-fluoropropyl... CAS#:84378-44-9 Flumazenil acid

This table shows customs‑related data including HS‑code, tariff and regulatory conditions for import and export.

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

This table lists relevant public references with title, journal and publication metadata for this compound.

Tonic current through GABAA receptors and hyperpolarization-activated cyclic nucleotide-gated channels modulate resonance properties of rat subicular pyramidal neurons.

Eur. J. Neurosci. 40(1) , 2241-54, (2014)

The subiculum, considered to be the output structure of the hippocampus, modulates information flow from the hippocampus to various cortical and sub-cortical areas such as the nucleus accumbens, later...

Mild Staphylococcus aureus Skin Infection Improves the Course of Subsequent Endogenous S. aureus Bacteremia in Mice.

PLoS ONE 10 , e0129150, (2015)

Staphylococcus aureus carriers with S. aureus bacteremia may have a reduced mortality risk compared to non-carriers. A role for the immune system is suggested. Here, we study in mice the effect of mil...

PET molecular imaging to investigate higher brain dysfunction in patients with neurotrauma.

Acta Neurochir. Suppl. 118 , 251-4, (2013)

Many neurotrauma patients suffer from higher brain dysfunction even when focal brain damage is not detected with MRI. We performed functional imaging with positron emission tomography (PET) to clarify...

This table contains target information, in‑vitro & in‑vivo assay data for this compound.

Name: Primary qHTS assay for inhibitors of alpha-synuclein gene (SNCA) expression
Source: NCGC
External Id: SNCA-p-activity-luciferase

Name: Cytochrome P450 Family 1 Subfamily A Member 2 (CYP1A2) small molecule antagonists: lu...
Source: 824
External Id: CYP273

Name: In vitro binding affinity against benzodiazepine receptor using [3H]diazepam as radio...
Source: ChEMBL
Target: Gamma-aminobutyric acid receptor subunit alpha-3
External Id: CHEMBL653129

Name: Tocris HTS for Inhibitors of Aerobactin Synthetase lucA
Source: 23265
External Id: IucA Pilot Assay Tocris Library

Name: Quantitative High-Throughput drug screen in 47 multiple myeloma cell lines against th...
Source: NCGC
Target: N/A
External Id: s-my-keats_OPM1-m4-1

Name: Quantitative High-Throughput drug screen in 47 multiple myeloma cell lines against th...
Source: NCGC
Target: N/A
External Id: s-my-OC1MY5-m4-1

Name: Increase the activity of the Burkholderia fixLJ 2-component system
Source: ICCB-Longwood/NSRB Screening Facility, Harvard Medical School
Target: Burkholderia multivorans
External Id: HMS1625

Name: Quantitative High-Throughput drug screen in 47 multiple myeloma cell lines against th...
Source: NCGC
Target: N/A
External Id: s-my-KMS_34-m4-1

Name: Quantitative High-Throughput drug screen in 47 multiple myeloma cell lines against th...
Source: NCGC
Target: N/A
External Id: s-my-keats_L363-m4-1

Name: Quantitative High-Throughput drug screen in 47 multiple myeloma cell lines against th...
Source: NCGC
Target: N/A
External Id: s-my-keats_OCIMY7-m4-1

Total 1044, Current Page 1 of 105

This table collects all English aliases, systematic names and CAS‑related synonyms of the compound.

Romazicon

Lanexat

Anexate

Ethyl 8-fluoro-5-methyl-6-oxo-5,6-dihydro-4H-benzo[f]imidazo[1,5-a][1,4]diazepine-3-carboxylate

Ro-15-1788

Ro 15-1788

YM-684

Ro 1722

Ethyl 8-fluoro-5-methyl-6-oxo-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

4H-Imidazo[1,5-a][1,4]benzodiazepine-3-carboxylic acid, 8-fluoro-5,6-dihydro-5-methyl-6-oxo-, ethyl ester

Mazicon

Flumazenil

FMZ

Flumazepil

8-Fluoro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylic acid ethyl ester

Ethyl-8-fluoro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxylate

4H-Imidazo(1,5-a)(1,4)benzodiazepine-3-carboxylic acid, 8-fluoro-5,6-dihydro-5-methyl-6-oxo-, ethyl ester

MFCD00242764

This section contains frequently‑asked‑questions about this compound, including basic parameters, properties, storage conditions and corresponding answers.

Q: What are the storage conditions for flumazenil?

A: Storage conditions for flumazenil: 2-8°C.

Q: What is the LogP of flumazenil?

A: LogP of flumazenil is 0.67.

Q: What are the downstream products of flumazenil?

A: Related downstream products(CAS) of flumazenil: 133368-73-7;84378-44-9.

Q: What is the safety information for flumazenil?

A: Safety information for flumazenil: S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice . S27:Take off immediately all contaminated clothing . S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .

Q: How is the water solubility of flumazenil?

A: Water solubility of flumazenil: 128 mg/L.

Q: What is the molecular weight of flumazenil?

A: Molecular weight of flumazenil is 303.288.

Q: What is the physical appearance of flumazenil?

A: flumazenil appears as solid | white.

Q: What are the uses of flumazenil?

A: Main uses of flumazenil: Flumazenil is a competitive GABAA receptor antagonist, used in the treatment of benzodiazepine overdoses.

Q: What are the upstream materials of flumazenil?

A: Related upstream materials(CAS) of flumazenil: 428507-28-2;193693-31-1;999-97-3;99-97-8;3400-09-7;2999-46-4;865-47-4;78755-80-3;658075-93-5.

Q: What is the CAS number of flumazenil?

A: CAS number of flumazenil is 78755-81-4.

This table lists manufacturers and suppliers of this compound, including vendor names and product supply reference information.

Shanghai Nianxing Industrial Co., Ltd

Henan Tianfu Chemical Co., Ltd.

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Henan Tianfu Chemical Co., Ltd.
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Product Name: flumazenil
Price: $Inquiry/1kg $Inquiry/25kg $Inquiry/1000kg $Inquiry/10ton
Purity: 99.0%
Delivery: Inquiry
Contact: Anson
Email: info@tianfuchem.com

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