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2. Cialis Side Effects: What to Expect (& How to Avoid Them) - AOL

   www.aol.com/cialis-side-effects-expect-avoid...

   Cialis has several common side effects, many of which also happen with other drugs used to treat ED, like sildenafil (generic Viagra®), vardenafil , and avanafil (Stendra®).

3. Viagra: What It Treats & Its Side Effects ( Plus What It Was ...

   www.aol.com/viagra-treats-side-effects-plus...

   Viagra (Sildenafil): Uses, Benefits and Side Effects. ... and angina (chest pain due to high blood pressure). Sildenafil can still be used to treat hypertension, but today, the primary use of this ...

4. Tadalafil: Your Ultimate Guide to Dosages, Side Effects & More

   www.aol.com/tadalafil-ultimate-guide-dosages...

   Like sildenafil (the active ingredient in Viagra), avanafil (sold as Stendra) and other ED medications, tadalafil is available in several dosages, but unlike the others, it can also be prescribed ...

5. Sildenafil - Wikipedia

   en.wikipedia.org/wiki/Sildenafil

   Sildenafil should not be taken by people on nitric oxide donors such as nitroglycerin (glycerin trinitrate), as this may result in a serious drop in blood pressure. [8] Sildenafil acts by blocking phosphodiesterase 5 (PDE 5), an enzyme that promotes breakdown of cGMP, which regulates blood flow in the penis. [8]

6. What Happens If You Take Viagra and You Don't Need It? - AOL

   www.aol.com/happens-viagra-dont-105800158.html

   Viagra could lead to more serious side effects, such as: Priapism (a painful, long-lasting arousal) Vision loss. Chest pain. Flu-like symptoms. Heart attack. Stroke. Dizziness. Sudden low blood ...

7. PDE5 inhibitor - Wikipedia

   en.wikipedia.org/wiki/PDE5_inhibitor

   Chemical structure of sildenafil (Viagra), the prototypical PDE5 inhibitor. A phosphodiesterase type 5 inhibitor (PDE5 inhibitor) is a vasodilating drug that works by blocking the degradative action of cGMP-specific phosphodiesterase type 5 (PDE5) on cyclic GMP in the smooth muscle cells lining the blood vessels supplying various tissues.

8. Is Sildenafil Safe for This Common Male Problem? - AOL

   www.aol.com/sildenafil-safe-common-male-problem...

   This story was reviewed by Mike Bohl, MD. In the ‘80s, researchers set out to test a medication called sildenafil citrate for treating high blood pressure and angina (chest pain) from heart disease.

9. Discovery and development of phosphodiesterase 5 inhibitors

   en.wikipedia.org/wiki/Discovery_and_development...

   The capillary blood flow velocity also increased in each individual patient and the mean capillary flow velocity of all patients increased significantly. These results came without significant reductions of the systemic blood pressure. [7] However, the therapeutic effects of PDE5 inhibitors in primary (idiopathic) RP are less well defined. [3]