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Related Experiment Videos

Digital plethysmography for assessing erythrityl tetranitrate bioavailability

R E Hannemann, R J Erb, W P Stoltman

    Clinical Pharmacology and Therapeutics
    |January 1, 1981
    PubMed
    Summary

    Erythrityl tetranitrate (ETN) tablets were bioavailable in all forms (oral, sublingual, chewable). Oral ETN demonstrated the longest duration of action, indicating its potential for sustained therapeutic effects.

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    Area of Science:

    • Pharmacology
    • Drug bioavailability studies

    Background:

    • Erythrityl tetranitrate (ETN) is a vasodilator used for managing cardiovascular conditions.
    • Understanding the bioavailability of different ETN dosage forms is crucial for optimizing therapeutic efficacy.

    Purpose of the Study:

    • To evaluate and compare the bioavailability of oral, sublingual, and chewable erythrityl tetranitrate (ETN) tablets in healthy male subjects.
    • To assess the duration of action for each ETN dosage form.

    Main Methods:

    • A randomized, complete crossover study was conducted in 15 normal men.
    • Drug-induced changes in diastolic amplitude response intensity were measured using digital plethysmography.
    • Pharmacokinetic parameters including AUC, Imax, and tmax were analyzed.

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    Main Results:

    • Sublingual nitroglycerin showed a significant response compared to placebo within the first hour.
    • All ETN dosage forms demonstrated significant responses compared to placebo for at least 2 hours.
    • Oral ETN exhibited a significantly longer duration of action, extending up to 6 hours.

    Conclusions:

    • All evaluated dosage forms of erythrityl tetranitrate (ETN) are bioavailable.
    • The oral (swallowed) formulation of ETN provides the longest duration of pharmacological effect.