Stendra (avanafil) is a PDE5 inhibitor medication used to treat erectile dysfunction (ED). Like Viagra® (sildenafil), Cialis® (tadalafil) and Levitra® (vardenafil), Stendra makes it easier to get and maintain an erection if you suffer from erectile dysfunction.
A relatively new ED medication, Stendra was developed throughout the 2000s and approved in April 2012 by the FDA. This makes it far newer than ED drugs like Viagra, which have been in use by men since the 1990s to help treat ED problems.
Because of its newer formula, Avanafil, the active ingredient in Stendra, has fewer side effects than the active ingredients in older ED medications like Viagra, Cialis and Levitra.
Below, we’ve explained what Stendra is and how it’s used to treat erectile dysfunction. We’ve also looked at some of the key advantages Stendra offers compared to older ED medications, from its relatively long half-life to its lower risk of causing certain side effects.
Stendra is an erectile dysfunction medication. More specifically, it’s a PDE5 inhibitor. It works by inhibiting the cGMP-specific phosphodiesterase type 5 enzyme (more simply, PDE5), which can regulate blood flow to the erectile tissue of your penis.
When you’re sexually aroused, your body increases the rate of blood flow to your penis. It takes about 130ml of blood for the average man to get a full erection. Avanafil, the active ingredient in Stendra, dilates the corpus cavernosum tissue of the penis, helping you get and stay hard.
Like other ED medications, Stendra won’t cause you to randomly get erections. Instead, it only makes it easier to get an erection if you’re already sexually aroused.
Stendra comes in tablet form in a variety of doses. The most common doses are 50mg, 100mg and 200mg, all of which are designed for use 15 to 30 minutes before engaging in sexual activity. A normal dose of Stendra lasts for up to six hours after you take the medication.
As a second-generation ED medication, Stendra has several differences from older drugs such as Viagra, including a reduced risk of causing certain side effects. We’ve covered these in more detail in the section below.
Stendra was developed throughout the 2000s and in 2012 gained approval by the FDA. This makes it the newest erectile dysfunction medication on the market. In comparison, Viagra was approved by the FDA in 1998, followed in 2003 by both Cialis and Levitra.
This means that Stendra is more than a decade newer than the original, first generation of ED treatments. There are several key differences between Stendra and the first generation drugs used to treat ED:
Although Stendra is a relatively new medication, there are already several studies that show it’s highly effective at treating erectile dysfunction.
In a clinical review of avanafil (the active ingredient in Stendra) from 2014, five studies involving more than 2,200 men were reviewed to assess the medication’s results.
The researchers found that avanafil is highly effective at improving International Index of Erectile Function-Erectile Function (IIEF-EF — a score used to assess erection problems). The men who received the medication showed improvements at all doses, from 50mg to 200mg.
As you might expect, avanafil was most effective at the highest 200mg dose. Unlike many other ED medications, which are more likely to cause side effects at a higher dose, the largest dose of avanafil did not appear to significantly increase the risk of the men experiencing side effects.
In a study from 2012, researchers found that avanafil was an “effective and well-tolerated” as a treatment for erectile dysfunction. The men involved in the study who received avanafil showed a significant improvement in IIEF-EFD at a dose of either 100mg or 200mg.
Finally, in clinical trials for avanafil, researchers stated that the drug "demonstrated statistically significant improvement in all three primary efficacy variables” related to erectile function. This study involved more than 600 men, ranging in age from 23 to 88 years old.
In short, avanafil works very well as a treatment for erectile dysfunction, with studies finding that it produces significant, measurable improvements in erection quality for men of all ages who are affected by ED.
Like other ED medications, Stendra is very easy to use. Simply take the Stendra tablet 15 to 30 minutes before you plan to have sex.
If you’re prescribed a lower dose of Stendra, such as the 50mg tablet, it’s recommended to use the medication at least 30 minutes before sexual activity. This allows your body enough time to fully absorb the medication’s active ingredient.
It’s okay to take Stendra on an empty stomach or with food. Stendra is safe to use after drinking alcohol, although you should limit your alcohol consumption to a maximum of three servings (for example, three glasses of wine or beer) to avoid increasing your risk of side effects.
You can safely use Stendra a maximum of once per day. Depending on how well the medication works for you, your doctor might recommend adjusting your dose to ensure you receive the full benefits from the medication.
Stendra is a prescription medication, meaning you’ll need to speak with a doctor and receive a prescription before you can purchase and use it. Your doctor will provide an appropriate dosage based on your symptoms and other factors (such as your age and general health).
Stendra can interact with some medications, particularly nitrates used to treat hypertension and other cardiovascular conditions. We’ve explained this in more detail below, along with other side effects you may experience while using Stendra.
Stendra is a safe, effective medication that only has few side effects, none of which are very common. For example, headaches, the most common side effect of Stendra, only affect 5 percent to 10 percent of men who use the medication.
Because Stendra works the same as other PDE5 inhibitors, such as Viagra and Cialis, its side effects are similar to these medications. Common side effects of Stendra include:
As a second-generation ED medication, Stendra is less likely to cause side effects than older drugs, such as Viagra. For example:
Stendra’s more selective effects on the PDE5 enzyme also mean it doesn’t cause certain side effects that are common in older medications. For example, up to 11 percent of men who use Viagra at the highest 100mg dose report vision problems, versus less than 1 percent of Stendra users.
Like other ED medications, Stendra can cause a mild reduction in your blood pressure levels while it’s active in your body.
If you use nitrates to treat hypertension or other cardiovascular health conditions, you should not use Stendra. These medications can interact with Stendra and cause you to experience a significant drop in blood pressure that can lead to fainting, heart attack or stroke.
Stendra, as well as similar PDE5 inhibitors, can also interact with certain alpha-blockers and CYP3A4 inhibitors. Because of this, it’s important to inform your doctor about all medications you currently use when you’re discussing Stendra as an ED treatment option.
Overall, Stendra is a safe and effective treatment for erectile dysfunction. While side effects do occur in a small percentage of men who use the medication, they’re usually mild and occur less often than with older, first-generation ED treatments.
As the newest FDA-approved erectile dysfunction medication, Stendra is a great option if you suffer from ED and want to use a medication that’s newer and less likely to cause side effects than older drugs such as Viagra (sildenafil), Cialis (tadalafil) or Levitra (vardenafil).
You can learn more about how Stendra works, as well as other medication used to treat ED, in our guide to what to expect from erectile dysfunction medication.