Vardenafil (Levitra) for Erectile Dysfunction: Complete Patient Guide
Need an erection you can count on? Vardenafil—better known by the brand name Levitra—starts working in about half an hour and lasts long enough for most couples to finish intercourse without rushing.
Vardenafil (Levitra) is a prescription pill that temporarily increases penile blood flow so men with erectile dysfunction (ED) can achieve and keep a firm erection for sexual activity. The tablet starts working in roughly 30–45 minutes, lasts four to six hours, and remains effective for about 3 out of every 4 men—even if other ED drugs have failed. Take one dose only when you need it, avoid nitrates, and call your doctor if you notice vision changes or an erection longer than four hours.
- Clinical trials show about 77% of men achieve penetrative sex after a single 20 mg vardenafil dose. [pmc.ncbi.nlm.nih.gov]
- The drug reaches peak blood levels in 55 minutes on an empty stomach and up to 95 minutes after a fatty meal. [goodrx.com]
- A headache (11%) and facial flushing (9%) are the most common side-effects, usually mild and short-lived.[mayoclinic.org]
- Use Rx.com to compare prices—most patients pay $8 or less per 20 mg tablet with a free discount card.
- Use Rx.com to get Vardenfil prescribed online, with just a quick 2-minute questionare required to a doctor.
What Vardenafil Is — a quick definition
Vardenafil is a phosphodiesterase-5 (PDE5) inhibitor approved by the FDA in 2003 to treat erectile dysfunction. By blocking the PDE5 enzyme inside penile tissues, the medicine lets cyclic guanosine monophosphate (cGMP) stick around longer—relaxing smooth muscle, widening blood vessels, and trapping blood in the corpora cavernosa so the penis becomes rigid.
Unlike daily heart or diabetes drugs, vardenafil is taken only as needed. The branded versions Levitra and Staxyn have now lost patent protection, so inexpensive generics are available nationwide.
If you need a refresher on ED basics, see our broader explainer erectile dysfunction: truth, causes & treatment.
How Vardenafil Improves Erections — the science in plain English
The pill amplifies your body’s own erection signal instead of creating one from scratch. Sexual arousal tells nerves in the penis to release nitric oxide (NO). NO raises cGMP, which relaxes penile arteries like opening a garden hose, letting blood fill spongy tissue. PDE5 normally breaks cGMP down after the job is done. Vardenafil sits on PDE5 like a blocker in football, giving cGMP extra time to do its job so the erection stays firm until ejaculation.
Why vardenafil may work when sildenafil doesn’t: Test-tube studies show it is roughly 10-fold more selective for PDE5 than for the heart enzyme PDE6, and it holds onto the enzyme a touch longer. That extra selectivity can reduce visual side-effects and improve rigidity in some “Viagra non-responders.” [pubmed.ncbi.nlm.nih.gov]
Recommended Dosing & Timing Tips
Most men start with 10 mg taken once, about 30 minutes before intercourse, with or without food. Your doctor may lower the dose to 5 mg for side-effects or raise it to 20 mg if erections are still too soft. Never take more than one dose in 24 hours.
Meal size and timing: A heavy, high-fat dinner can delay the drug’s kick-in time by roughly 40 minutes. If spontaneity matters, keep the meal to under 800 calories or take the pill first.
Alcohol limits: Two drinks or fewer appear safe for most people; more than that can drop your blood pressure and sabotage the erection you’re chasing.
Ready to get a prescription online?
Board-certified U.S. physicians can evaluate your ED today and send vardenafil—or another proven option—directly to your local pharmacy.
How Effective Is Vardenafil? — real numbers
Roughly three out of four men regain functional erections on their first attempt. In pivotal 12-week trials, 78–81% of participants answered “Yes” to the Global Assessment Question, compared with 32% on placebo.[pubmed.ncbi.nlm.nih.gov] The drug worked across all severities, including diabetes-related ED.
| Study Population | Success Rate with Vardenafil | Placebo |
|---|---|---|
| General ED (IIEF-EF ≤ 25) | 80.8% | 32.3% |
| Diabetic men | 68.4% | 27.1% |
| Post-prostatectomy | 55.6% | 20.9% |
| Prior sildenafil non-responders | 59.2% | 14.6% |
Long-term extension studies show the benefit holds for at least two years without new safety signals.[pubmed.ncbi.nlm.nih.gov]
Side-Effects & Drug Interactions—what to expect
Most side-effects are mild and fade within a couple of hours. In U.S. labeling, headaches (11%), flushing (9%), and nasal congestion (5%) top the list. [mayoclinic.org] Taking the pill after food and hydrating well can blunt these annoyances.
Red-flag interactions:
- Nitrates or riociguat: Can cause a life-threatening drop in blood pressure.
- Alpha-blockers (e.g., tamsulosin): Separate doses by at least six hours unless your prescriber says otherwise.
- Strong CYP3A4 inhibitors (ketoconazole, clarithromycin): May require a max vardenafil dose of 5 mg.
For a broader look at ED anxiety and performance issues, read sex feels hard: ED & anxiety guide.
Vardenafil vs. Viagra vs. Cialis—how they stack up
All three drugs are PDE5 inhibitors, but small differences matter for lifestyle fit.
| Feature | Vardenafil | Sildenafil | Tadalafil |
|---|---|---|---|
| Onset (empty stomach) | ~35 min | ~30 min | ~25 min |
| Duration | 4–6 h | 4 h | 24–36 h |
| Fat-meal delay | Yes | Yes (stronger) | No |
| Visual color-change reports | Rare | 4–6% | Very rare |
| Typical cash price/20 mg | $12 | $10 (100 mg) | $18 (20 mg) |
| Rx.com discount card price* | $8 | $6 | $13 |
*Average price paid at 60,000+ U.S. pharmacies, May 2026. Use Rx.com’s free discount card to lock in today’s rate.
Practical Ways to Boost Results
Small lifestyle tweaks can make the pill work even better.
Trim belly fat: Every 2-inch drop in waist circumference correlates with a 15% higher chance of responding to a PDE5 inhibitor.
Check testosterone: Low T can blunt any ED drug; adding replacement may double your response odds if you are deficient.
Mind the clock: The drug doesn’t create desire—plan intimacy when you and your partner naturally feel aroused.
Stress control: Short breathing drills or therapy can lower performance anxiety; see our article on supporting a partner with ED for conversation tips.
Is vardenafil the right first-line ED pill for you?
Check the column that fits your situation:
✅ Likely good to try
- ED only during intercourse, not 24/7
- No nitrates or riociguat in current meds
- Able to plan sex 30–60 min ahead
- Blood pressure above 100/60 mm Hg
- No severe liver impairment
🏥 Need a doctor’s review first
- Taking any form of nitroglycerin
- History of retinal eye disorders
- Unstable chest pain or recent heart attack
- Severe kidney or liver disease
- Blood pressure under 90/50 mm Hg
🚨 When to Contact Your Healthcare Provider
Contact your doctor immediately if you experience any of the following:
- Erection lasting longer than 4 hours — priapism can permanently damage penile tissue.
- Sudden vision loss or blurriness — could signal NAION, a rare optic nerve problem.
- Ringing in ears or sudden hearing drop — can be linked to PDE5 inhibitor use.
- Chest pain during sex — may indicate unstable heart disease requiring emergency care.
- Severe dizziness or fainting — possible dangerously low blood pressure.
- Allergic rash or swelling of lips/tongue — signs of anaphylaxis.
- Irregular heartbeat — vardenafil can modestly prolong the QT interval.
- Shortness of breath at rest — could signal fluid overload or cardiac issues.
Scientific References
- Goldstein I, et al. Sustained efficacy and safety of vardenafil for treatment of erectile dysfunction. Urology, 2005.
- Padma-Nathan H, et al. Sustained efficacy and tolerability with vardenafil over 2 years of treatment in men with erectile dysfunction. J Sex Med, 2004.
- Eardley I, et al. Erectile response with vardenafil in sildenafil non-responders. BJU Int, 2005.
- Montorsi F, et al. Vardenafil improves erectile function irrespective of disease severity. Int J Impot Res, 2006.
- MedlinePlus. Vardenafil: Drug Information. National Library of Medicine, 2026.
- Mayo Clinic. Vardenafil (Oral Route) Description and Brand Names. Updated 2026.
Frequently Asked Questions
How long does vardenafil stay in your system?
The plasma half-life is about 4–5 hours, so most of the drug is gone within a day. However, erectile effects usually fade after six hours.
Can I split a 20 mg vardenafil tablet to save money?
Yes, the drug is evenly distributed in the tablet, so you can cut it with a pill splitter. Make sure the scored halves equal your prescribed dose.
Does vardenafil increase testosterone?
No—PDE5 inhibitors do not raise hormone levels. In fact, low testosterone can reduce their effectiveness, so have your levels checked if you notice weak results.
Is it safe to take vardenafil every day?
The drug is approved as needed. Daily use hasn’t been widely studied long-term; if you need frequent dosing, ask about once-daily tadalafil instead.
Can women use vardenafil?
Vardenafil is not FDA-approved for women, and studies have not shown clear sexual benefits. Women should avoid it outside a clinical trial.
Will vardenafil affect my fertility?
The medication does not change sperm count or motility in healthy men. Any fertility impact of ED pills is considered negligible.
Does Medicare cover vardenafil?
Most Medicare Part D plans exclude ED drugs, but commercial coupons or the Rx.com discount card can reduce out-of-pocket costs significantly.
Get Back in the Game—Start Your ED Visit Now
Answer a few secure questions, connect with a licensed provider, and pick up your medication at any local pharmacy—often the same day.