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  2. Vardenafil - Wikipedia

    en.wikipedia.org/wiki/Vardenafil

    Vardenafil's indications and contraindications are the same as with other PDE5 inhibitors; it is closely related in function to sildenafil citrate (Viagra) and tadalafil (Cialis). The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ...

  3. Your ED Pill Guide: Everything You Need to Know Before ... - AOL

    www.aol.com/ed-pill-guide-everything-know...

    Sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra) typically start working within 30 to 60 minutes, while avanafil (Stendra) works within 15 to 30 minutes. As with most prescription ...

  4. Things You Probably Don't Know About Viagra (Like What It Was ...

    www.aol.com/things-probably-dont-know-viagra...

    Viagra usually starts working 30 to 60 minutes after taking it. But simply swallowing the little blue pill won’t automatically make you hard — you still have to be aroused, either through ...

  5. What Is the Safest ED Medication? - AOL

    www.aol.com/safest-ed-medication-105700669.html

    For example, headache — the most common side effect of most oral ED medication — was reported by 21 percent of men who used sildenafil citrate in clinical trials at a 50mg dosage.

  6. PDE5 inhibitor - Wikipedia

    en.wikipedia.org/wiki/PDE5_inhibitor

    PDE5 inhibitors are contraindicated within 24 hours (or 48 hours with tadalafil) of taking alpha-blockers, soluble guanylate cyclase stimulators, or nitrate medications such as isosorbide mononitrate or isosorbide dinitrate. [1] Concurrent use of these medications can lead to life-threatening low blood pressure. [5]

  7. Erectile dysfunction - Wikipedia

    en.wikipedia.org/wiki/Erectile_dysfunction

    Erectile dysfunction (ED), also referred to as impotence, is a form of sexual dysfunction in males characterized by the persistent or recurring inability to achieve or maintain a penile erection with sufficient rigidity and duration for satisfactory sexual activity.

  8. Got Headaches from Viagra or Cialis? Here's Why & How to Treat It

    www.aol.com/got-headaches-viagra-cialis-heres...

    Headaches are a common side effect of ED medications such as sildenafil (the active ingredient in Viagra), tadalafil (Cialis) and vardenafil (Levitra), with about 25 percent of men prescribed ...

  9. Tadalafil - Wikipedia

    en.wikipedia.org/wiki/Tadalafil

    One advantage Cialis has over Viagra and Levitra is its 17.5-hour half-life (thus Cialis is advertised to work for up to 36 hours, [32] after which time there remains approximately 25% of the absorbed dose in the body) when compared to the four-hour half-life of sildenafil (Viagra).

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