II. Mechanism

  1. Direct vasodilators relax vascular Smooth Muscle
  2. One mechanism of vasodilation is mediated by nitric oxide in the vascular endothelium

III. Medications: Direct Acting Vasodilators IV

  1. Hydralazine (Apresoline)
    1. Dose: 10-40 mg IV/IM q4-6h
  2. Hydralazine with Isosorbide Dinitrate 37.5/20 (BiDil)
    1. Dose: 1-2 tablets orally three times daily
    2. For Class III CHF patients (esp. African American)
    3. Very expensive: $400/month
    4. Generic Drugs separately are $60/month
  3. Diazoxide (Hyperstat)
    1. Dose: 1-3 mg/kg up to 150 mg IV q5-15 min
  4. Nitroprusside Sodium (Nipride)
  5. Minoxidil (Loniten)
  6. Fenoldopam (Corlopam)

Images: Related links to external sites (from Bing)

Related Studies

Cost: Medications

diazoxide (on 11/23/2022 at Medicaid.Gov Survey of pharmacy drug pricing)
DIAZOXIDE 50 MG/ML ORAL SUSP Generic $7.19 per ml

Ontology: Diazoxide (C0012022)

Definition (NCI) A benzothiadiazine derivate with antihypertensive and hyperglycemic activities. Diazoxide increases membrane permeability to potassium ions in vascular smooth muscle, thereby stabilizing the membrane action potential and preventing vascular smooth muscle contraction; this results in peripheral vasodilatation and decreases in peripheral vascular resistance. This agent also inhibits insulin release by interacting with ATP-sensitive potassium channels of pancreatic islet beta-cells.
Definition (CSP) peripheral vasodilator that reduces blood pressure; diazoxide also has antidiuretic and hypoglycemic effects.
Definition (MSH) A benzothiadiazine derivative that is a peripheral vasodilator used for hypertensive emergencies. It lacks diuretic effect, apparently because it lacks a sulfonamide group.
Definition (PDQ) A benzothiadiazine derivate with antihypertensive and hyperglycemic activities. Diazoxide increases membrane permeability to potassium ions in vascular smooth muscle, thereby stabilizing the membrane action potential and preventing vascular smooth muscle contraction; this results in peripheral vasodilatation and decreases in peripheral vascular resistance. This agent also inhibits insulin release by interacting with ATP-sensitive potassium channels of pancreatic islet beta-cells. Check for "http://www.cancer.gov/Search/ClinicalTrialsLink.aspx?id=39290&idtype=1" active clinical trials or "http://www.cancer.gov/Search/ClinicalTrialsLink.aspx?id=39290&idtype=1&closed=1" closed clinical trials using this agent. ("http://nciterms.nci.nih.gov:80/NCIBrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&code=C428" NCI Thesaurus)
Concepts Pharmacologic Substance (T121) , Organic Chemical (T109)
MSH D003981
SnomedCT 318642007, 325291008, 387328001, 58905004
LNC LP14713-9, MTHU001807
English Diazoxide, 2H-1,2,4-Benzothiadiazine, 7-chloro-3-methyl-, 1,1-dioxide, 3-Methyl-7-chloro-1,2,4-benzothiadiazine 1,1-Dioxide, diazoxide, Diazoxide [cardiovascular use], Diazoxide [endocrine use], diazoxide (medication), Diazoxide [Chemical/Ingredient], diazoxides, Diazoxide [cardiovascular use] (product), Diazoxide [endocrine use] (product), Diazoxide (product), Diazoxide (substance), Diazoxide [cardiovascular use] (substance), Diazoxide [endocrine use] (substance), DIAZOXIDE
Swedish Diazoxid
Czech diazoxid
Finnish Diatsoksidi
Russian DIAZOKSID, ДИАЗОКСИД
Japanese ダイアゾキサイド, ジアゾキシド
Croatian DIAZOKSID
Polish Diazoksyd
Spanish diazóxido (uso cardiovascular), diazóxido [uso endocrino], diazóxido (uso cardiovascular) (producto), diazóxido [uso endocrino] (producto), diazóxido (producto), diazóxido (sustancia), diazóxido, Diazóxido
French Diazoxide
German Diazoxid
Italian Diazossido
Portuguese Diazóxido

Ontology: Vasodilator antihypertensive drugs (C0354333)

Concepts Pharmacologic Substance (T121)
SnomedCT 318641000
English Vasodilator antihypert drugs, Vasodilator antihypertensive drugs, Vasodilator antihypertensive drugs (product), Vasodilator antihypertensive drugs (substance)
Spanish fármaco antihipertensivo vasodilatador (producto), fármaco antihipertensivo vasodilatador, medicamentos antihipertensivos vasodilatadores (producto), medicamentos antihipertensivos vasodilatadores (sustancia), medicamentos antihipertensivos vasodilatadores

Ontology: Hyperstat (C0699324)

Concepts Pharmacologic Substance (T121) , Organic Chemical (T109)
MSH D003981
English Hyperstat