Abstract：
:Inflammatory conditions, such as rheumatoid arthritis, reduce response to calcium channel and beta-adrenergic antagonists but not the angiotensin II type 1 receptor (AT(1)R) antagonist valsartan. Inflammation also reduces clearance of some drugs or active metabolite, thereby reducing response. Active (n = 14) and controlled rheumatoid arthritis (n = 12) and healthy subjects (n = 12) received losartan (100 mg). Blood pressures were measured, and samples were taken for pharmacokinetic and inflammatory mediator concentration determination. Active disease significantly increased arthritic index, nitric oxide, and Creactive protein. Although no between-group difference in plasma losartan concentration-time curves was observed, concentrations of the active metabolite, EXP 3174, were significantly reduced by arthritis. This, however, was not accompanied by reduced clinical response. One subject produced no detectable concentrations of EXP 3174 likely due to insufficient CYP2C9 activity. Despite reduced concentrations of the active metabolite, AT1R antagonists potency does not appear to be reduced by inflammation.
journal_name
J Clin Pharmacoljournal_title
Journal of clinical pharmacologyauthors
Daneshtalab N,Lewanczuk RZ,Russell AS,Jamali Fdoi
10.1177/0091270006292163subject
Has Abstractpub_date
2006-11-01 00:00:00pages
1344-55issue
11eissn
0091-2700issn
1552-4604pii
46/11/1344journal_volume
46pub_type
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