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  • It is in a class of drugs called PDE5 inhibitors that work in a variety of ways to increase blood flow.

    Reuters: Top News

  • Viagra is part of a class of drugs known as PDE5 inhibitors (phosphodiesterase type 5 inhibitor) that restricts the enzyme that regulates blood flow in the penis.


  • Dell'Agli and his colleagues tested the four plants in vitro to see how efficient they were at inhibiting PDE5.

    Boing Boing

  • Because PDE5 helps control blood flow to the penis, inhibiting PDE5 promotes male erection.

    Boing Boing

  • This confirmed previous studies showing that icariin, a compound found inside the horny goat weed, is a PDE5 inhibitor.

    Boing Boing

  • Viagra's active compound, sildenafil, works by inhibiting an enzyme called phosphodiesterase-5 (PDE5).

    Boing Boing

  • Info | PDE5 Sildenafil, Citrate, which can damage the optic neuropathy (NAION).

    GOPer Shays To Retire If He Doesn't Get Committee Post

  • But pertaining to the efficacy of Viagra in treating male impotence, there is no room for even a little doubt, Viagra inhibits PDE5 enzyme and makes a man capable for sexual intercourse.

    Don't rely on package inserts for your meds

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