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2. Sildenafil - Wikipedia

   en.wikipedia.org/wiki/Sildenafil

   Rare but serious side effects include vision problems, hearing loss, and prolonged erection (priapism) that can lead to damage to the penis. [8] 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]

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

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

   Side Effects of Viagra Use. Like any medication, side effects of Viagra may come with its many benefits. Still, Viagra is safe when used as directed. Viagra may cause common side effects, including:

4. 5 Must-Know Tips Before Taking Sildenafil 100mg - AOL

   www.aol.com/5-must-know-tips-taking-105700758.html

   Sildenafil side effects are generally mild and fade over time, but they occur more frequently at 100mg than 25mg and 50mg, respectively. For example, in clinical trials of sildenafil, 28 percent ...

5. 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 ...

6. 4 Common ED Pills: Weighing the Pros & Cons of Each - AOL

   www.aol.com/4-common-ed-pills-weighing-141800609...

   The relatively short duration of sildenafil can also mean the side effects are short-lived. Finally, sildenafil is a good ED treatment from a cost perspective.

7. PDE5 inhibitor - Wikipedia

   en.wikipedia.org/wiki/PDE5_inhibitor

   The occurrence of side effects, or adverse drug reactions (ADRs), with PDE5 inhibitors depends on the dose and type of agent. [1] Headache is a very common ADR, occurring in >10% of patients. Other common ADRs include: dizziness, flushing, dyspepsia, nasal congestion or rhinitis. [6]

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

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

   Like many other side effects of Viagra, headaches can become more common if you use a high dose of the medication or if you use Viagra, Cialis or Levitra frequently. Ridofranz/istockphoto.

9. Discovery and development of phosphodiesterase 5 inhibitors

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

   Sildenafil did not prove effective for coronary heart disease but an interesting side effect was discovered, a penile erection. That side effect soon became the main field of investigation. [23] The inhibitor is highly selective for the PDE5 family. [22] Sildenafil is a prototype of PDE5 inhibitors that Pfizer launched as Viagra.