Document Detail

Effect of food on blood hydralazine levels and response in hypertension.
MedLine Citation:
PMID:  6734044     Owner:  NLM     Status:  MEDLINE    
A study with a nonspecific hydralazine assay reported that food increased hydralazine concentrations in plasma. We used a specific HPLC hydralazine assay to determine the effect of food on hydralazine blood levels and hemodynamic responses after oral hydralazine. Six subjects with uncomplicated essential hypertension were given 1 mg/kg hydralazine solution orally on two occasions at least 3 days apart. On 1 study day subjects fasted and on the other they were given a standard meal 45 min before hydralazine. Mean arterial pressure and heart rate were monitored for 2 hr before and for 4 hr after hydralazine and frequent venous blood samples were drawn for hydralazine assay. Hepatic blood flow was estimated by determination of indocyanine green clearance before food, after food, and 30 min after hydralazine. Peak blood hydralazine concentrations fell in all (46.2% +/- 11.5%; means +/- SE) and areas under the blood hydralazine concentration/time curves fell (45.7% +/- 9.5%) after food. This could not be explained by changes in liver blood flow. Food-related reductions in blood levels of hydralazine were associated with reduced vasodepressor effects (41.5% +/- 5.6%). It is possible that food increases intravascular conversion of hydralazine to hydralazine pyruvic acid hydrazone. The reduction in vasodepressor response suggests that patients with hypertension should take hydralazine at a fixed time in relation to meals.
A M Shepherd; N A Irvine; T M Ludden
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Clinical pharmacology and therapeutics     Volume:  36     ISSN:  0009-9236     ISO Abbreviation:  Clin. Pharmacol. Ther.     Publication Date:  1984 Jul 
Date Detail:
Created Date:  1984-08-13     Completed Date:  1984-08-13     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0372741     Medline TA:  Clin Pharmacol Ther     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  14-8     Citation Subset:  AIM; IM    
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MeSH Terms
Administration, Oral
Blood Pressure / drug effects
Chromatography, High Pressure Liquid
Heart Rate / drug effects
Hydralazine / blood*,  therapeutic use
Hypertension / drug therapy
Indocyanine Green / metabolism
Liver / blood supply,  drug effects
Middle Aged
Grant Support
Reg. No./Substance:
3599-32-4/Indocyanine Green; 86-54-4/Hydralazine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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