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  2. Sildenafil (Viagra), tadalafil (Cialis), vardenafil (formerly sold under the brand names Levitra and Staxyn), and avanafil (Stendra) belong to a class of drugs known as “ PDE5 inhibitors.” PDE5 inhibitors increase the amount of blood that fills the penis, helping an erection last long enough for satisfying sex. They don’t affect arousal or libido.
    www.goodrx.com/conditions/erectile-dysfunction/vi…
    A doctor will usually prescribe medications called PDE-5 inhibitors for erectile dysfunction, as long as it’s safe for you to take them. They include: Viagra (Sildenafil). Cialis (Tadalafil). Levitra (Vardenafil). Spedra (Avanafil).
    onlinedoctor.superdrug.com/cant-get-or-stay-hard.h…
     
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