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Related Experiment Videos

Nitroglycerin absorption from transdermal systems: formulation effects and metabolite concentrations.

R L Williams1, K M Thakker, V John

  • 1Department of Medicine, University of California, San Francisco 94143.

Pharmaceutical Research
|June 1, 1991
PubMed
Summary

Two transdermal nitroglycerin (NTG) formulations showed unequal drug and metabolite levels initially. Dinitrate metabolite concentrations were much higher than NTG, potentially impacting therapeutic effects.

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Area of Science:

  • Pharmacology
  • Drug Metabolism
  • Transdermal Drug Delivery

Background:

  • Nitroglycerin (NTG) is a vasodilator used for angina.
  • Transdermal formulations offer sustained drug delivery.
  • Understanding NTG pharmacokinetics, including metabolite behavior, is crucial for optimizing therapy.

Purpose of the Study:

  • To compare plasma concentrations of NTG and its dinitrate metabolites from two controlled-release transdermal formulations.
  • To investigate the relationship between metabolite concentrations and parent drug levels.
  • To explore factors influencing NTG bioavailability, such as metabolite ratios and potential racial differences.

Main Methods:

  • Pharmacokinetic analysis of plasma concentrations in 16 healthy male subjects.

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  • Comparison of concentration-time curves for NTG and its two dinitrate metabolites.
  • Assessment of the ratio of 1,2-glyceryl dinitrate to 1,3-glyceryl dinitrate.

    • Main Results:

    • The two transdermal formulations did not yield equivalent plasma concentrations of NTG or its metabolites during initial dosing.
    • Concentrations of both dinitrate metabolites significantly exceeded parent drug levels.
    • The ratio of 1,2-glyceryl dinitrate to 1,3-glyceryl dinitrate was observed, potentially indicating route-dependent bioavailability.
    • Preliminary data suggested possible racial variations in transdermal NTG absorption.

    Conclusions:

    • Transdermal NTG formulations exhibit variable pharmacokinetic profiles.
    • High concentrations of dinitrate metabolites may contribute to the overall therapeutic effect of NTG.
    • The ratio of dinitrate metabolites could serve as a biomarker for transdermal NTG bioavailability.
    • Further research is warranted to elucidate racial differences in transdermal NTG absorption.