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Related Experiment Videos

Differences in nifedipine concentration-effect relationship between capsule and slow release tablet administration

G Castañeda-Hernández1, C Hoyo-Vadillo, J E Herrera

  • 1Departamento de Farmacología y Toxicología, Instituto Politécnico Nacional, Mexico City, Mexico.

International Journal of Clinical Pharmacology and Therapeutics
|January 1, 1995
PubMed
Summary

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Slow-release nifedipine (SRT) offers a more favorable pharmacodynamic profile than immediate-release capsules (CAP). SRT provides a smoother hypotensive effect with less heart rate increase, indicating improved therapeutic outcomes.

Area of Science:

  • Pharmacology
  • Cardiovascular Medicine

Background:

  • Nifedipine is a calcium channel blocker used to treat hypertension.
  • Different formulations of nifedipine, such as immediate-release capsules (CAP) and slow-release tablets (SRT), have varying pharmacokinetic and pharmacodynamic profiles.

Purpose of the Study:

  • To compare the pharmacokinetic and pharmacodynamic effects of nifedipine CAP and SRT in healthy volunteers.
  • To investigate the relationship between plasma nifedipine concentrations and its hypotensive and chronotropic effects.

Main Methods:

  • Healthy volunteers received either nifedipine 10 mg CAP or 20 mg SRT.
  • Plasma concentrations, diastolic blood pressure, and heart rate were monitored.
  • Correlations between plasma concentrations and physiological effects were analyzed.

Related Experiment Videos

Main Results:

  • Nifedipine plasma concentrations rose faster with CAP than SRT.
  • Both formulations reduced diastolic blood pressure, but SRT achieved a similar effect at lower concentrations.
  • CAP induced a significant positive chronotropic effect, while SRT showed a smaller, non-significant increase in heart rate.

Conclusions:

  • Nifedipine SRT exhibits pharmacokinetic advantages and a more favorable pharmacodynamic profile than CAP.
  • The gradual release of nifedipine from SRT leads to a smoother hypotensive effect with less counter-regulatory heart rate increase.
  • SRT may offer improved therapeutic benefits due to reduced activation of compensatory mechanisms.