Clinical Utility of Nifedipine and Diltiazem Plasma Levels in Patients with Angina Pectoris Receiving Monotherapy and Combination Treatment

Jeffrey Goldberger, William H. Frishman

Research output: Contribution to journalArticle

Abstract

The clinical utility of nifedipine and diltiazem blood levels in patients with angina pectoris receiving monotherapy (N = 14) and combination treatment (N = 9) were assessed in a placebo run‐in, double blind, randomized, crossover study. Compared to placebo, diltiazem (mean daily dose 360 mg), nifedipine (mean daily dose 90 mg) and combination diltiazem‐nifedipine therapy (mean daily dose 55 mg of nifedipine, 360 mg of diltiazem) were associated with reductions in weekly angina attacks and nitroglycerin consumption. Although both drugs used as monotherapy and in combination were also associated with significant increments in exercise tolerance and other improved angina parameters, these changes were not related to the plasma levels of either drug. Nifedipine plasma levels were measured by gas chromatography and diltiazem plasma levels measured by reverse high‐pressure liquid chromatography from specimens obtained 2–5 hours after the last previous dose, after 1, 2 and 3 weeks of treatment, and during baseline placebo and placebo washout periods. With combination therapy, there was no effect on the diltiazem plasma level compared to monotherapy. The significant decrease in the nifedipine dose in patients on combination therapy did not significantly change nifedipine plasma levels. Determinations of plasma levels of diltiazem and nifedipine in the management of patients is of no value in the management of patients with angina pectoris except for monitoring treatment compliance and overdosage. 1989 American College of Clinical Pharmacology

Original languageEnglish (US)
Pages (from-to)628-634
Number of pages7
JournalThe Journal of Clinical Pharmacology
Volume29
Issue number7
DOIs
StatePublished - Jul 1989
Externally publishedYes

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)

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