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304-20-1

304-20-1 structure
304-20-1 structure
  • Name: Hydralazine hydrochloride
  • Chemical Name: hydralazine hydrochloride
  • CAS Number: 304-20-1
  • Molecular Formula: C8H9ClN4
  • Molecular Weight: 196.637
  • Catalog: API Circulatory system medication Antihypertensive drug
  • Create Date: 2018-02-28 08:00:00
  • Modify Date: 2026-06-30 08:09:43
  • Hydralazine Hydrochloride is a direct-acting vasodilator that is used as an antihypertensive agent.Target: OthersHydralazine (apresoline) is a direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles. By relaxing vascular smooth muscle, vasodilators act to decrease peripheral resistance, thereby lowering blood pressure and decreasing afterload. However, this only has a short term effect on blood pressure, as the system will reset to the previous, high blood pressure necessary to maintain pressure in the kidney necessary for natriuresis. The long term effect of antihypertensive drugs comes from their effects on the pressure natriuresis curve. It belongs to the hydrazinophthalazine class of drugs [1]. Hydralazine may reduce blood pressure when compared to placebo in patients with primary hypertension, however this data is based on before and after studies, not RCTs. Furthermore, its effect on clinical outcomes remains uncertain [2].
Name hydralazine hydrochloride
Synonyms 1-Hydrazinophthalazine hydrochloride direct-acting vasodilator
Asozart
1-HydrazinophthalazineHydrochloride>
1-PHTHALAZINYLHYDRAZINE HYDROCHLORIDE
Hydralazine Hydrochloride K1E1830.998mg/mg(dr)
1-Hydrazinylphthalazine hydrochloride
1-hydrazino-phthalazinmonohydrochlor
HYDRALAZINEHYDROCHLORIDE
1-hydrazino-phthalazinmonohydrochloride
Phthalazine,1-hydrazinyl-, hydrochloride (1:1)
Apresoline (TN)
1-hydrazinophthalazine hydrochloride
hydralazinechloride
HYDRALAZINE MONOHYDROCHLORIDE
EINECS 206-151-0
Phthalazine, 1-hydrazino-, monohydrochloride
1(2h)-phthalazinone,hydrazone,monohydrochloride
Asozt
azine hydrochL
Hydralazine Hydrochloride
Hydrapress
Pressfall
prapat5968
1-HYDRAZINOPHTHALAZINE HYDROCHLORIDE
Lopress
1-hydrazinyl-phthalazine, hydrochloride (1:1)
apresoline-esidrix
8aH-phthalazin-1-one hydrazone hydrochloride
aiselazine
Hydralazine hydrochloride //BP
apresolinehydrochloride
Apresoline
hydralazinemonohydrochloride
1-hydrazinylphthalazine hydrochloride (1:1)
hydrallazine hydrochloride
1-Hydrazinophthalazine hydrochloride a direct-acting vasodilator
phthalazin-1-ylhydrazine hydrochloride
Hydralazinhydrochlorid
Slow-Apresolin
1-HYDRAZINOPHTHALAZINEHCL
HYDRALAZINE HYDROCHLORIDE
1-Hydrazinylphthalazine Hydrochloride
Apulon
HYDRAZINOPHTHALAZINEHYDROCHLORIDE
1(2H)-Phthalazinone, hydrazone, hydrochloride
Hydrallazine hydrochloride
Phthalazine, 1-hydrazinyl-, hydrochloride (1:1)
1-hydrazinophthalazinemonohydrochloride
Hydralazine hydrochloride (JP15
Hydrolazine
Lopres
Hydralazine hydrochloride CRS
Phthalazinone, hydrazone, monohydrochloride
MFCD00135998
1-Hydrazinophthalazine hydrochloride (1:1)
Hyperazin
1-hydrazinophtalazine chlorhydrate
1-hydrazinyl-Phthalazine hydrochloride
(Z)-1-Hydrazono-1,2-dihydrophthalazine hydrochloride
Phthalazin-1-ylhydrazine hydrochloride
Hyperex
Hydralazine hydrochloride,1-Hydrazinophthalazine hydrochloride
Hydralazine HCl/Hydralazine Hydrochloride
apresine
Rolazine
Dralzine
nor-press25
Hydralazine HCl
HydralazineHclC8H8N4.HC1
MONO-HYDRAZINOPHTHALAZINE HCL
Description Hydralazine Hydrochloride is a direct-acting vasodilator that is used as an antihypertensive agent.Target: OthersHydralazine (apresoline) is a direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles. By relaxing vascular smooth muscle, vasodilators act to decrease peripheral resistance, thereby lowering blood pressure and decreasing afterload. However, this only has a short term effect on blood pressure, as the system will reset to the previous, high blood pressure necessary to maintain pressure in the kidney necessary for natriuresis. The long term effect of antihypertensive drugs comes from their effects on the pressure natriuresis curve. It belongs to the hydrazinophthalazine class of drugs [1]. Hydralazine may reduce blood pressure when compared to placebo in patients with primary hypertension, however this data is based on before and after studies, not RCTs. Furthermore, its effect on clinical outcomes remains uncertain [2].
Related Catalog
References

[1]. Bourreli, B., et al., Additive effects of dihydralazine during enflurane or isoflurane hypotensive anaesthesia for spinal fusion. Can J Anaesth, 1988. 35(3 ( Pt 1)): p. 242-8.

[2]. Kandler, M.R., et al., Hydralazine for essential hypertension. Cochrane Database Syst Rev, 2010(8): p. CD004934.
Boiling Point 491.9ºC at 760 mmHg
Melting Point 273°C
Molecular Formula C8H9ClN4
Molecular Weight 196.637
Flash Point 251.3ºC
Exact Mass 196.051575
PSA 63.10000
LogP 1.72400
Storage condition -20?C Freezer
Stability Stable. Incompatible with strong oxidizing agents.

CHEMICAL IDENTIFICATION

RTECS NUMBER :
TH9000000
CHEMICAL NAME :
Phthalazine, 1-hydrazino-, monohydrochloride
CAS REGISTRY NUMBER :
304-20-1
LAST UPDATED :
199806
DATA ITEMS CITED :
28
MOLECULAR FORMULA :
C8-H8-N4.Cl-H
MOLECULAR WEIGHT :
196.66
WISWESSER LINE NOTATION :
T66 CNNJ BMZ &GH

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
280 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intravenous
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
34 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
188 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
83 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
73 mg/kg
TOXIC EFFECTS :
Behavioral - convulsions or effect on seizure threshold Behavioral - excitement Lungs, Thorax, or Respiration - respiratory stimulation
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intravenous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
71 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Mammal - dog
DOSE/DURATION :
59 mg/kg/2D-I
TOXIC EFFECTS :
Endocrine - hyperglycemia Blood - changes in serum composition (e.g. TP, bilirubin, cholesterol) Nutritional and Gross Metabolic - changes in chlorine
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
2950 mg/kg/78W-C
TOXIC EFFECTS :
Tumorigenic - neoplastic by RTECS criteria Lungs, Thorax, or Respiration - tumors Blood - lymphoma, including Hodgkin's disease
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
DOSE :
176 mg/kg
SEX/DURATION :
female 1-22 day(s) after conception
TOXIC EFFECTS :
Reproductive - Specific Developmental Abnormalities - musculoskeletal system
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
DOSE :
1100 mg/kg
SEX/DURATION :
female 7-17 day(s) after conception
TOXIC EFFECTS :
Reproductive - Maternal Effects - other effects Reproductive - Specific Developmental Abnormalities - musculoskeletal system
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Oral
DOSE :
1100 mg/kg
SEX/DURATION :
female 7-17 day(s) after conception
TOXIC EFFECTS :
Reproductive - Effects on Newborn - stillbirth Reproductive - Effects on Newborn - viability index (e.g., # alive at day 4 per # born alive)
TYPE OF TEST :
TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE :
Subcutaneous
DOSE :
360 mg/kg
SEX/DURATION :
female 8-19 day(s) after conception
TOXIC EFFECTS :
Reproductive - Effects on Embryo or Fetus - fetotoxicity (except death, e.g., stunted fetus)
TYPE OF TEST :
DNA damage
TYPE OF TEST :
Sister chromatid exchange

MUTATION DATA

TYPE OF TEST :
Cytogenetic analysis
TEST SYSTEM :
Rodent - hamster Fibroblast
DOSE/DURATION :
7500 ug/L
REFERENCE :
ESKHA5 Eisei Shikenjo Hokoku. Bulletin of the Institute of Hygienic Sciences. (Kokuritsu Eisei Shikenjo Kagaku, 18-1 Bushitsu Johobu, Setagaya-ku, Tokyo 158, Japan) V.1- 1886- Volume(issue)/page/year: (96),55,1978 *** REVIEWS *** IARC Cancer Review:Animal Limited Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) V.1- 1972- Volume(issue)/page/year: 24,85,1980 *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - X6128 No. of Facilities: 145 (estimated) No. of Industries: 1 No. of Occupations: 4 No. of Employees: 3818 (estimated) No. of Female Employees: 3142 (estimated)
Symbol GHS06
GHS06
Signal Word Danger
Hazard Statements H301-H315-H319-H335
Precautionary Statements P261-P301 + P310-P305 + P351 + P338
Personal Protective Equipment dust mask type N95 (US);Eyeshields;Faceshields;Gloves
Hazard Codes Xn:Harmful
Risk Phrases R22;R36/37/38
Safety Phrases S26-S36/37/39-S45
RIDADR UN 2811 6.1/PG 3
WGK Germany 3
RTECS TH9000000
Packaging Group III
Hazard Class 6.1
HS Code 2942000000
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%
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