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When patients ask about avanafil vs sildenafil, the question underneath the question is almost always the same: how fast can I actually count on this working? Nobody wants to take a pill, watch the clock, and wonder if tonight is the night it kicks in at the wrong moment.
The short answer is that avanafil (brand name Stendra) tends to work faster than sildenafil (brand name Viagra). But "faster" doesn’t always mean "better for you." Speed is one variable. Duration, side effects, food interactions, and cost all matter too.
Here’s how the two stack up in real-world use, based on FDA labeling, clinical trial data, and what tends to play out at the pharmacy counter.
How Avanafil vs Sildenafil Actually Work
Both drugs belong to the same family: PDE5 inhibitors. They block an enzyme called phosphodiesterase type 5, which lets blood vessels in the penis relax and fill more easily during sexual stimulation. Neither drug creates arousal on its own. You still need the brain and nervous system to do their part.
Sildenafil was the first PDE5 inhibitor approved by the FDA back in 1998. Avanafil came along in 2012 as a newer-generation option designed for faster onset and a cleaner side effect profile. Both are FDA-approved to treat erectile dysfunction in adult men.
The mechanism is nearly identical. The pharmacokinetics, meaning how quickly the drug hits the bloodstream and how long it stays there, are where the meaningful differences show up.
Speed of Onset: The Real Difference
This is the headline most people came for.
- Avanafil: Typically starts working in 15 to 30 minutes. Some patients notice effects in as little as 10 to 12 minutes.
- Sildenafil: Usually kicks in around 30 to 60 minutes. On a full stomach, especially after a fatty meal, that window stretches considerably.
In the head-to-head comparison of avanafil vs sildenafil, avanafil wins on speed by a fairly clear margin. A clinical study published in the Journal of Sexual Medicine found that a meaningful percentage of men taking avanafil reported successful intercourse within 15 minutes of dosing, which is faster than what’s typical with sildenafil.
That said, sildenafil isn’t slow. It just has a more predictable window if you plan ahead. If you’ve ever wondered whether timing matters with food, our piece on taking sildenafil on an empty stomach walks through what actually changes onset time in practice.
How Long Each Drug Lasts
Speed is only half the story. Duration matters too.
- Avanafil: Effects last roughly 4 to 6 hours.
- Sildenafil: Effects last roughly 4 to 6 hours as well, sometimes pushing toward 5.
So they’re roughly comparable on duration. Neither is in the same league as tadalafil, which can last up to 36 hours. If long-window flexibility is your priority, the daily vs on-demand tadalafil routine comparison is worth reading.
Side Effects: Where Avanafil Often Wins Quietly
The most common side effects with both drugs overlap heavily:
- Headache
- Flushing of the face and neck
- Nasal congestion
- Indigestion or reflux
- Mild back pain
- Visual disturbances (more typical with sildenafil)
What I tell patients is that avanafil tends to produce fewer of the visual side effects, like the blue-tinted vision some sildenafil users describe. That’s because avanafil is more selective for the PDE5 enzyme and has less crossover with PDE6, which is involved in vision. For men who’ve tried sildenafil and disliked the visual effect, avanafil is often the next stop.
Both drugs share the same serious warnings: they can cause a dangerous drop in blood pressure if combined with nitrates (used for chest pain) or certain alpha blockers. Anyone with significant cardiovascular disease should have the conversation with their prescriber before starting either one. If you want a broader look at tolerability tradeoffs across the class, our overview of the best ED medication with the least side effects compares all four PDE5 options.
Food, Alcohol, and Timing
Here’s where avanafil pulls ahead in everyday life.
Sildenafil is sensitive to food. A heavy, fatty meal can delay onset by 30 to 60 minutes and blunt peak concentration. That’s why the standard advice is to take it on an empty stomach when possible.
Avanafil is much less affected by food. You can take it with or without a meal and onset stays reasonably consistent. For a spontaneous evening, that flexibility is genuinely useful.
Alcohol is another wildcard. Both drugs interact with alcohol in similar ways: a drink or two is usually fine for most men, but heavier drinking compounds the blood-pressure-lowering effect and increases the odds the medication doesn’t work as intended.
Cost and Availability
This is where sildenafil wins decisively.
Sildenafil went generic in 2017 and prices dropped dramatically. A 30-day supply of generic sildenafil often costs a fraction of brand-name Stendra. Avanafil went generic more recently and prices are coming down, but it’s still typically the pricier option at most US pharmacies, including under many Medicare Part D plans.
For patients paying cash or with high-deductible insurance, generic sildenafil remains the value play. You can compare cash prices on generic sildenafil and avanafil at edrugstore.com to see what makes sense for your situation.
Which Should You Pick?
The honest answer is: it depends on what you weigh most heavily.
- Pick avanafil if you want the fastest onset, you eat unpredictably, you’ve had visual side effects on sildenafil, or you value spontaneity over cost.
- Pick sildenafil if you can plan 45 to 60 minutes ahead, you want the lowest out-of-pocket cost, or you’ve already used it successfully.
Neither is "the best." They’re tools with different profiles. The right pick depends on your health history, what other medications you take (especially nitrates, alpha blockers, and certain antifungals), and your budget.
The Bottom Line on Avanafil vs Sildenafil
In the avanafil vs sildenafil comparison, avanafil works faster and is friendlier with food, while sildenafil is cheaper and has a longer track record. Both are effective for most men with erectile dysfunction, and both share the same core safety considerations. Talk to your prescriber or pharmacist about which fits your routine, health history, and budget, and don’t hesitate to ask about switching if your first choice isn’t quite right.
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 Information, official labeling and approval history for PDE5 inhibitors including sildenafil and avanafil.
- MedlinePlus: Erectile Dysfunction, NIH-curated overview of ED causes and FDA-approved treatments.
- Medicare Part D Drug Coverage, federal guidance on prescription coverage relevant to ED medication cost comparisons.
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