Document Detail

Pregnancy-induced increase in metoprolol metabolism.
MedLine Citation:
PMID:  4006368     Owner:  NLM     Status:  MEDLINE    
Five women who developed hypertension during pregnancy received metoprolol, 10 mg iv; 3 days later they received metoprolol, 100 mg by mouth. Blood and urine samples were collected after each dose. The same procedure was repeated 3 to 6 months after delivery. The apparent oral clearance of metoprolol during pregnancy exceeded that after pregnancy by a factor of 2 to 13. As a result, after oral dosing the peak plasma concentrations during pregnancy were only 12% to 55% those after delivery, and the plasma AUCs were reduced to the same extent. Oral bioavailability increased by a factor of 1.3 to 3.7 after pregnancy. Systemic clearance after pregnancy was 26% to 97% that during pregnancy, but this difference was not significant. Metoprolol plasma protein binding was the same on both study occasions. Our data cannot be explained by a change in gastrointestinal absorption, because the urinary recovery of metoprolol and its metabolites was slightly higher during pregnancy. It is concluded that the greater metoprolol clearance during pregnancy results from increased hepatic metabolism of the drug.
S Högstedt; B Lindberg; D R Peng; C G Regårdh; A Rane
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical pharmacology and therapeutics     Volume:  37     ISSN:  0009-9236     ISO Abbreviation:  Clin. Pharmacol. Ther.     Publication Date:  1985 Jun 
Date Detail:
Created Date:  1985-07-31     Completed Date:  1985-07-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372741     Medline TA:  Clin Pharmacol Ther     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  688-92     Citation Subset:  AIM; IM    
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MeSH Terms
Blood Proteins / metabolism
Hypertension / drug therapy,  metabolism*
Metoprolol / analogs & derivatives,  metabolism*,  therapeutic use
Pregnancy Complications, Cardiovascular / drug therapy,  metabolism*
Protein Binding
Time Factors
Reg. No./Substance:
0/Blood Proteins; 37350-58-6/Metoprolol; 56392-14-4/H117-04; 56392-16-6/alpha-hydroxymetoprolol; 62572-94-5/O-demethylmetoprolol

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

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