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If you’re weighing avanafil vs sildenafil, you’re almost certainly asking the same question most patients ask at the pharmacy counter: which one actually starts working faster? Speed matters. Spontaneity matters. And the answer isn’t quite as simple as the marketing brochures make it sound.
Both drugs belong to the same family (PDE5 inhibitors), both are FDA-approved to treat erectile dysfunction, and both work by improving blood flow when you’re aroused. But they don’t behave identically once you swallow the pill. One is older, cheaper, and well-studied. The other is newer, more selective, and designed specifically to kick in fast.
What follows is the practical comparison, based on the clinical data and what tends to play out in real-world use.
How Avanafil vs Sildenafil Actually Work
Both medications block an enzyme called phosphodiesterase type 5 (PDE5). When PDE5 is inhibited, blood vessels in the penis can relax and fill more easily with arousal. No arousal, no effect. Neither pill creates desire on its own, which surprises a lot of patients.
The difference is in the chemistry. Sildenafil (brand name Viagra) was the first PDE5 inhibitor approved by the FDA, back in 1998. Avanafil (brand name Stendra) came later, in 2012, and was engineered to be more selective for PDE5 and less likely to hit related enzymes that cause side effects like visual disturbances or muscle aches. The NIH has a useful overview of how PDE5 inhibitors compare if you want the deeper pharmacology.
In practice, that selectivity translates to two things patients actually notice: a faster onset and, for many, a cleaner side effect profile.
Speed of Onset: The Real Difference
Here’s where avanafil vs sildenafil pulls apart most clearly.
- Avanafil: Typically begins working in 15 to 30 minutes. Some men report effects in as little as 12 minutes on an empty stomach.
- Sildenafil: Usually takes 30 to 60 minutes, with peak blood levels around the 60-minute mark.
If you took both on identical empty stomachs, avanafil would generally cross the finish line first. That’s the headline. For a closer look at sildenafil’s onset specifically, this breakdown of how fast Viagra works walks through what affects timing in real-world conditions.
Food is the big variable. A heavy or fatty meal can delay sildenafil’s onset by an hour or more. Avanafil is less affected by food, though a giant steak dinner still isn’t doing it any favors.
Duration: How Long Each One Lasts
Speed is one half of the equation. Duration is the other.
- Avanafil lasts about 6 hours.
- Sildenafil lasts about 4 to 6 hours, with most of the effect concentrated in the first 4.
So avanafil is roughly comparable in window length, sometimes slightly longer. Neither comes close to tadalafil (Cialis), which can stretch to 36 hours. If duration is your priority over speed, that’s a different conversation entirely. If you’re weighing all three, this comparison of Viagra, Cialis, Levitra, and Stendra covers the trade-offs side by side.
Side Effects: Where Avanafil Has an Edge
Both drugs share the typical PDE5 inhibitor side effect list:
- Headache (the most common)
- Flushing
- Nasal congestion
- Indigestion
- Back pain or muscle aches
- Visual changes (more common with sildenafil)
Because avanafil is more selective for PDE5, the visual disturbances (blue-tinted vision, light sensitivity) that some sildenafil users notice are less commonly reported. Clinical trial data summarized by the Cleveland Clinic on ED medications puts overall side effect rates with avanafil in the 7 to 10 percent range for the most common complaints, generally a bit lower than sildenafil at comparable doses.
That said, individual response varies a lot. I’ve had patients who couldn’t tolerate sildenafil at all switch to avanafil and do fine, and the reverse happens too. If side effects are your main concern, this comparison of tadalafil vs avanafil side effects digs into the specifics.
Cost and Availability
This is where the picture flips. Sildenafil has been generic since 2017 and is now one of the most affordable prescription medications in the United States. Generic sildenafil can run a few dollars per tablet, sometimes less with pharmacy discounts.
Avanafil is also available as a generic now, but pricing remains higher than sildenafil in most cases. Brand-name Stendra can be considerably more expensive without insurance coverage. You can compare prices on generic sildenafil at edrugstore.com to see what your specific dose looks like.
For most patients, the cost gap means sildenafil wins on value unless the speed or side effect advantage of avanafil specifically matters to them.
Drug Interactions and Safety
Both medications carry the same critical warnings:
- Never combine with nitrates (nitroglycerin, isosorbide). The blood pressure drop can be life-threatening.
- Use caution with alpha-blockers prescribed for high blood pressure or BPH.
- Avoid mixing with heavy alcohol, which worsens side effects and reduces effectiveness.
- Tell your prescriber about heart disease, recent stroke, severe liver problems, or low blood pressure.
Grapefruit juice can raise blood levels of both drugs, but the effect is more pronounced with sildenafil. The Mayo Clinic’s sildenafil drug information has a thorough interaction list worth reviewing if you take multiple medications.
Your prescriber will determine the right dose for you based on your other medications, kidney and liver function, and how you respond to the first trial.
So Which One Should You Pick?
For pure speed of onset, avanafil vs sildenafil is a fairly clear win for avanafil. Fifteen to thirty minutes versus thirty to sixty is a meaningful difference when you don’t want to plan your evening around a pill.
For cost, sildenafil wins by a wide margin.
For side effects, avanafil has a modest edge, particularly around visual symptoms, but most patients tolerate both reasonably well.
The honest answer most clinicians give: try sildenafil first. It’s cheap, well-studied, and works for the majority of men. If onset speed is a real problem, or if you experience side effects you can’t tolerate, avanafil is a reasonable next step. Talk to your prescriber or pharmacist about which fits your specific situation, and ask whether a starter dose makes sense before committing to a larger supply.
This article is for informational purposes only and is not medical advice. Always consult a licensed pharmacist or physician before starting, stopping, or changing any medication.
References
- FDA Drug Approvals and Databases, Confirms FDA approval status of sildenafil and avanafil for ED.
- NIH/NCBI: PDE5 Inhibitors Overview, Pharmacology and clinical comparison of PDE5 inhibitors.
- Cleveland Clinic: Oral Medications for ED, Side effect rates and clinical guidance.
- Mayo Clinic: Sildenafil Drug Information, Drug interactions and safety warnings.
Dr Steven Schlosser
Dr. Schlosser graduated from Lafayette College Phi Beta Kappa and attended Georgetown Medical School. He had 4 years of medical residency training at Tufts University in Boston in both Gynecology and Internal Medicine. He has had a spotless medical career for the past 40+ years and is Board Certified. Learn More