If you've been comparing ED medications, avanafil and tadalafil probably came up side by side. Both are PDE5 inhibitors. Both require a prescription in Canada. Both work — but they work differently, and that difference matters more than most comparison articles let on.
The real question isn't which one is "better." It's which one fits your life. If you want the fastest possible onset, that's one answer. If you want to stop timing pills altogether, that's another. This guide breaks down both honestly — including the parts most sites skip.
If you're still figuring out what's actually behind your symptoms, start with our guide on What Is Erectile Dysfunction before diving into medication comparisons.
Both medications treat erectile dysfunction by blocking the PDE5 enzyme — the enzyme that limits blood flow to the penis. When PDE5 is blocked, blood flows more freely during sexual stimulation, making it easier to get and maintain an erection.
Neither medication creates an erection on its own. Sexual arousal is still required for either to work. They remove the physiological barrier — they don't replace desire.
The mechanism is the same for both — but the details of how selectively they act makes a real difference.
When you're sexually aroused, your brain signals the release of nitric oxide in the blood vessels of the penis. Nitric oxide triggers the production of cGMP, a compound that relaxes smooth muscle and allows blood to flow in. PDE5 breaks down cGMP, ending the erection. PDE5 inhibitors block that breakdown.
Where avanafil is different:
Where tadalafil is different:
This is the most meaningful difference for men who want flexibility without planning ahead.
Avanafil onset:
Tadalafil onset:
If spontaneity matters to you, avanafil has a genuine edge here that no other oral ED medication can match.
Speed goes to avanafil. Duration goes to tadalafil — and it isn't even close.
Avanafil duration:
Tadalafil duration:
For a detailed breakdown of exactly what happens hour by hour with tadalafil, our article on How Long Does Cialis Work for ED covers the full timeline including the half-life math behind the 36-hour number.
This is one of the most underappreciated things about tadalafil, and it changes the whole calculation for men who are sexually active more than twice a week.
Tadalafil is the only PDE5 inhibitor with an approved daily dosing regimen.
How it works:
What this means practically:
Avanafil has no approved daily dosing option. It is taken on demand only.
Avanafil:
| Dose | When to Take | Notes |
|---|---|---|
| 50 mg | 15–30 min before | Starting dose for sensitive patients |
| 100 mg | 15–30 min before | Standard starting dose |
| 200 mg | 15–30 min before | Maximum dose if 100 mg is insufficient |
Tadalafil:
| Dose | Format | When to Take |
|---|---|---|
| 10 mg | On-demand | 30–60 min before sexual activity |
| 20 mg | On-demand | If 10 mg is insufficient |
| 2.5 mg | Daily | Same time each day |
| 5 mg | Daily | Same time each day |
Both medications require a prescription in Canada. Dosing should always be determined by your healthcare provider based on your health history and current medications.
Common side effects shared by both:
Where they differ:
| Side Effect | Avanafil | Tadalafil |
|---|---|---|
| Back pain / muscle aches | Less common | More common (PDE11 related) |
| Vision side effects | Less common | Less common |
| Nasal congestion | Mild | Mild |
| Duration of side effects | Shorter (drug clears faster) | Can linger 12–24 hrs after dosing |
Serious side effects — both medications:
For a complete breakdown of avanafil-specific risks and how to manage them, see our guide on Avanafil Side Effects.
Both avanafil and tadalafil are contraindicated for men who:
Men taking alpha-blockers or multiple blood pressure medications need medical review before starting either, as blood pressure effects can compound in ways that require dose adjustment.
This is exactly why neither medication should be sourced without a valid prescription from a licensed Canadian healthcare provider. Products marketed online without a prescription — regardless of what they are called — carry real safety risks that no amount of low price justifies.
| Feature | Avanafil | Tadalafil | Sildenafil |
|---|---|---|---|
| Brand name | Stendra | Cialis | Viagra |
| Onset | 15–30 min | 30–60 min | 30–60 min |
| Duration | 6–12 hours | Up to 36 hours | 4–6 hours |
| Daily dose option | No | Yes | No |
| Affected by food | Minimal | Minimal | Yes (fatty meals delay it) |
| Muscle aches | Less common | More common | Less common |
| Generic in Canada | Limited | Widely available | Widely available |
| Best for | Fastest onset | Longest window / daily use | Cost-effective on-demand |
To understand sildenafil's place in this picture, our article on What Type of Drug Is Sildenafil Citrate explains how it fits into the PDE5 inhibitor class. And if you're weighing brand vs generic for sildenafil specifically, the Sildenafil vs Viagra Canada guide covers that comparison clearly.
| On-Demand Tadalafil | Daily Tadalafil | |
|---|---|---|
| Typical dose | 10 mg or 20 mg | 2.5 mg or 5 mg |
| When to take | 30–60 min before activity | Same time daily, no planning |
| Time to first effect | 30–60 minutes | 3–5 days |
| Full benefit | Single dose peak (~2 hrs) | ~4 weeks of consistent use |
| Effective window | Up to 36 hours per dose | Continuous — always covered |
| Best for | Sex less than twice a week | Sex more than twice a week, or wanting no timing pressure |
Availability varies by province and location. Avanafil is less widely stocked than tadalafil or sildenafil across Canada. Your doctor or pharmacist can advise on access in your area, and in some cases a specialty pharmacy may be the best option.
Avanafil generally works faster. It may start working in as little as 15 minutes, while tadalafil typically begins working within 30 to 60 minutes. For men who prefer minimal planning before sexual activity, avanafil may offer an advantage.
Tadalafil lasts significantly longer than avanafil. Its effects may last up to 36 hours, compared with approximately 6 to 12 hours for avanafil. If a longer treatment window is important, tadalafil is often the preferred choice.
You should only switch between avanafil and tadalafil under the guidance of a healthcare provider. Changing PDE5 inhibitors without medical advice may increase the risk of drug interactions, side effects, or inappropriate dosing.
Yes. Heavy alcohol consumption can worsen erectile dysfunction and increase the risk of side effects such as dizziness and low blood pressure with both avanafil and tadalafil. Moderate alcohol intake is generally less problematic, but excessive drinking should be avoided.
Yes. Both avanafil and tadalafil are prescription-only medications in Canada. Always obtain them through a licensed healthcare provider and a reputable Canadian pharmacy.
If either medication becomes less effective, consult your healthcare provider before changing the dose or switching medications. Factors such as low testosterone, cardiovascular disease, medication interactions, or psychological conditions may reduce treatment effectiveness.
Yes. Generic tadalafil contains the same active ingredient, strength, and quality standards as brand-name Cialis. It provides comparable effectiveness and safety, with lower cost primarily due to reduced branding and marketing expenses.
This comparison is provided for educational purposes only and should not replace professional medical advice. Avanafil and Tadalafil should be used only under the guidance of a qualified healthcare provider. The most suitable treatment depends on your medical history, current medications, and individual health needs.
