Tadalafil vs Sildenafil: How the Two ED Medications Compare

Tadalafil and sildenafil are both FDA-approved PDE5 inhibitors that treat erectile dysfunction by improving blood flow to the penis during sexual arousal, and they work about equally well for most men. The biggest difference is timing: sildenafil works for a few hours and is usually taken about an hour before sex, while tadalafil can improve erections for up to 36 hours and also comes as a low daily option. Your provider helps you choose based on your health, your routine and how you respond.

How both medications work

An erection depends on blood flowing into the penis and staying there. Sexual arousal releases nitric oxide, which raises a messenger molecule called cGMP that relaxes blood vessels in the penis. An enzyme called PDE5 breaks cGMP down.

Tadalafil and sildenafil block PDE5, so cGMP lasts longer and blood flow improves. Two points follow from this:

• Arousal is still required. Neither medication causes an erection on its own.
• They do not change desire. If low desire is the main concern, tell your provider, because a different approach may fit better.

Side-by-side comparison

Choosing the right fit

Sildenafil may suit you if:

• You plan ahead and prefer a medication that wears off within hours.
• You have used it before and it works well with few side effects.
• You do not usually eat a heavy meal right before sex, or you can plan around it.

Tadalafil may suit you if:

• You want more freedom around timing, such as a weekend window.
• You prefer not to think about meals and timing.
• You are interested in a daily option so you do not have to plan each time.
• You also have urinary symptoms from an enlarged prostate, since tadalafil is approved for that too.

The AUA guideline notes that as-needed and daily tadalafil appear to produce similar effectiveness, so the choice often comes down to lifestyle. Your provider sets the dose for either medication and adjusts it based on how well it works and how you feel. Many men find their fit after a short trial.

Safety first

The labels for both medications share the same core warnings. Your provider reviews these during your online visit.

Do not combine with nitrates. This includes nitroglycerin for chest pain and recreational amyl nitrite ("poppers"). Tadalafil also should not be combined with riociguat, a medication for pulmonary hypertension.

Heart health. Sexual activity puts some demand on the heart. If your cardiovascular health makes sex unsafe, these medications are not appropriate. Tell your provider about chest pain, heart attack, stroke, heart rhythm problems, or very high or very low blood pressure.

Blood pressure medications and alcohol. Combining either drug with alpha blockers, other blood pressure medications or a lot of alcohol can lower blood pressure and cause dizziness or fainting.

Get emergency care for:

• An erection that lasts more than 4 hours.
• Sudden loss of vision in one or both eyes.
• Sudden decrease or loss of hearing, especially with ringing in the ears or dizziness.
• Chest pain, fainting or severe dizziness during or after sex.

Other medications matter. Some antibiotics, antifungals and HIV medications raise blood levels of these drugs. Share your full medication and supplement list, and do not combine two ED medications.

ED can be an early health signal

Erection quality depends on healthy blood vessels, nerves and hormones. That is why ED can sometimes be an early sign of heart disease, diabetes or high blood pressure. The AUA guideline encourages clinicians to evaluate men with ED for these conditions and notes that lifestyle changes such as better diet and more physical activity can improve both overall health and erectile function. Training, sleep and a lean waistline help on every level.

Frequently asked questions

Which works faster, tadalafil or sildenafil?

Both can start working within about 30 minutes to an hour for many men. Sildenafil is typically taken about an hour before sex. A heavy, high-fat meal can slow sildenafil, while tadalafil is less affected by food.

Can I switch between tadalafil and sildenafil?

Yes, with your provider's guidance. Many men try one and switch if the timing or side effects do not suit them. Do not take both at the same time.

Is daily tadalafil better than taking it as needed?

Neither is better for everyone. The AUA guideline reports similar effectiveness for daily and as-needed tadalafil. Daily use removes the need to plan, while as-needed use means taking it only when you want to.

Will these medications increase my sex drive?

No. They improve the physical response to arousal but do not raise desire. If low desire is part of the picture, mention it during your visit so your provider can look at the full picture.

Talk to a licensed provider

If you want to compare tadalafil and sildenafil for your situation, start a secure online visit. A licensed provider will review your health history and medications and decide whether a prescription is appropriate for you. If it is, a licensed US pharmacy ships it discreetly to your door.

This article is educational and is not medical advice. Rx programs require an online visit with a licensed provider. Results vary.