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Is phenylephrine pivalate a prodrug?

J S Mindel, S T Shaikewitz, S M Podos

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |December 1, 1980
    PubMed
    Summary
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    Phenylephrine pivalate exhibits intrinsic alpha-adrenergic activity, unlike its prodrug assumption. This activity persists even when conversion to phenylephrine is blocked, challenging prior hypotheses.

    Area of Science:

    • Ophthalmology
    • Pharmacology
    • Adrenergic Receptor Research

    Background:

    • Phenylephrine pivalate was previously considered a prodrug with minimal intrinsic activity, based on structural similarity to dipivefrin.
    • Dipivefrin's activity is known to be inhibited by echothiophate iodide, an acetylcholinesterase inhibitor.

    Purpose of the Study:

    • To investigate the intrinsic pharmacologic activity of phenylephrine pivalate.
    • To determine if phenylephrine pivalate's activity is dependent on conversion to phenylephrine.

    Main Methods:

    • Rabbits were pretreated with echothiophate iodide to inhibit acetylcholinesterase.
    • Ocular administration of phenylephrine hydrochloride and phenylephrine pivalate was performed.
    • Mydriasis (pupil dilation) was measured in terms of quantity and duration.

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    Main Results:

    • Phenylephrine pivalate induced mydriasis that was not prevented by echothiophate iodide pretreatment.
    • The mydriasis caused by phenylephrine pivalate was comparable in quantity and duration to that of phenylephrine hydrochloride.
    • This indicates phenylephrine pivalate possesses significant alpha-adrenergic activity independent of its conversion to phenylephrine.

    Conclusions:

    • Phenylephrine pivalate demonstrates intrinsic alpha-adrenergic activity.
    • The molecule's activity is not solely reliant on its conversion to phenylephrine.
    • This finding challenges the established view of phenylephrine pivalate as a prodrug devoid of intrinsic effects.