Most adults start with 10 mg of Levitra about 60 minutes before sex and adjust between 5–20 mg, no more than once a day.
Picking the right dose of vardenafil comes down to two things: how you respond and how safe it is with your health and other meds. This guide lays out the usual ranges, timing, and red flags so you can read your prescription with confidence and talk with your prescriber about any tweaks.
Levitra Dose At A Glance
The table below puts the common starting point and adjustments in one place. Stay within the tablet strengths your pharmacy dispenses, and never take more than one dose in a 24-hour window.
| Who/Scenario | Suggested Starting Dose | Max/Frequency |
|---|---|---|
| Most adults | 10 mg taken about 1 hour before sexual activity | Up to 20 mg; once daily only |
| Adults 65+ | Begin with 5 mg | Increase slowly if well tolerated |
| On stable alpha-blocker therapy | Start at 5 mg | Use care with dose changes; watch blood pressure |
| Moderate liver impairment (Child-Pugh B) | 5 mg | Do not exceed 10 mg |
| Using strong/moderate CYP3A4 inhibitors | 2.5–5 mg with strict spacing | See exact limits below |
Why Doctors Land On These Numbers
Vardenafil relaxes blood vessels in erectile tissue. The 10 mg starting point gives a balance of effect and side effects in most men. Older adults tend to reach higher blood levels from the same tablet, so the label suggests starting lower. Liver disease slows breakdown of the drug, which raises exposure, so the cap is lower there. Blood pressure medicines that block alpha receptors can add to the drop in pressure, so a 5 mg entry dose is safer.
Close Variant: Picking A Safe Amount Of This ED Tablet
Think of your first few tries as a test period. If the 10 mg tablet works and you feel fine, stay there. If the effect is weak and side effects are mild, your clinician may raise you to 20 mg on a separate day. If flushing, headache, or dizziness show up, you may be steered to 5 mg instead. Skip extra tablets for a “booster.” One dose per day is the line.
Timing, Food, And What To Expect
Swallow the tablet with water about an hour before sex. A meal does not block absorption, though a heavy dinner can slow the kick-in time a bit. Most men feel peak effect between 30 and 120 minutes. Sexual stimulation still matters; pills do not create an erection on their own. If a dose misses the mark, wait until the next day before you change anything.
What If You Use The Orally Disintegrating Form?
Some versions dissolve on the tongue. They are not interchangeable milligram-for-milligram with regular tablets. Use the product your prescriber wrote and the pharmacy dispensed. If you need a different strength, ask for a switch to the standard tablet form.
When Less Is More: Medicines That Force A Lower Dose
Certain drugs slow the breakdown of vardenafil and raise blood levels. The official FDA label sets hard limits in these cases. If you take one of the medicines below, stay at or under the listed cap and space doses as directed by the label.
Caps With CYP3A4 Inhibitors
Ritonavir or cobicistat: no more than 2.5 mg in a 72-hour period. Indinavir, saquinavir, atazanavir, ketoconazole 400 mg/day, itraconazole 400 mg/day, clarithromycin: no more than 2.5 mg in 24 hours. Ketoconazole 200 mg/day, itraconazole 200 mg/day, erythromycin: no more than 5 mg in 24 hours. If you also use an alpha-blocker, the safe starting point can be even lower.
Drugs You Must Not Mix
Nitrates in any form and riociguat are off-limits with vardenafil. The combination can drop blood pressure to a risky level. Recreational “poppers” count here too.
How Many Tries Before You Judge The Dose?
Plan on several attempts before you call a dose a win or a miss. Many men need 4–8 tries with arousal before the response is clear. If you keep getting weak results at the highest safe tablet and your timing is solid, your clinician may check for other causes or offer a different option in the same class.
Safety First: Who Should Not Take It
A tablet that lowers blood pressure can be risky in a few settings. Avoid vardenafil if you use nitrates or riociguat. Do not use it on dialysis. Skip it with severe liver disease. If you have a history of a rare eye problem called NAION, or a long QT rhythm, your clinician may steer you away from this drug.
Side Effects: What’s Common And What’s Not
Headache, flushing, stuffy nose, and heartburn lead the list. Dizziness can occur, especially with alcohol or dehydration. Stop and seek care for chest pain, fainting, vision loss, or hearing loss. An erection that lasts more than four hours needs urgent attention to prevent damage.
Second Table: Interaction And Timing Quick Guide
| Medication/Class | Can You Combine? | Notes |
|---|---|---|
| Nitrates (nitroglycerin, isosorbide) | No | Contraindicated; risk of severe hypotension |
| Riociguat | No | Contraindicated by label |
| Alpha-blockers | Yes, with care | Be stable on the alpha-blocker; start vardenafil at 5 mg |
| Strong/moderate CYP3A4 inhibitors | Yes, with strict caps | 2.5–5 mg limits and spacing as listed above |
| Grapefruit products | Best to avoid | May raise drug levels and side effects |
How To Get The Most From Each Dose
Stack The Odds In Your Favor
Pick a calm window without multitasking. Keep alcohol light. Hydrate. If a heavy meal pushed your last tablet’s effect later, try a lighter dinner next time. Give yourself at least a full hour before judging the response.
Dial In The Range
Use a simple log for your first few doses: date, tablet strength, timing, food, effect, and any side effects. Bring it to your next visit. That short record helps your prescriber adjust the strength with precision.
What About Other ED Tablets?
Vardenafil is one of several PDE5 inhibitors. If you can’t take it due to interactions or side effects, another agent may fit better. Your prescriber may try a different day-to-day profile or a tablet that suits a different meal pattern. Never stack agents in this class on the same day.
Reliable Sources For Dose And Safety Details
The official FDA label for vardenafil lists the starting dose, caps with CYP3A4 inhibitors, and the do-not-mix list including nitrates and riociguat. For patient-friendly guidance on how to take the tablet and common side effects, see MedlinePlus: Vardenafil.
Smart Rules To Stay Safe
- One tablet per day is the limit.
- Space doses as the label directs if your other meds slow drug breakdown.
- Avoid nitrates and riociguat entirely while using this drug.
- Stop and get care for chest pain, fainting, vision or hearing loss, or an erection that won’t go down.
- Store tablets dry at room temperature and away from children.
Dose Adjustments By Situation
Age Over 65
Start at 5 mg. Many men in this group still do well at that level, and those who need a bit more can step up slowly while watching for dizziness and flushing.
Moderate Liver Disease
Begin at 5 mg and cap at 10 mg. That tighter range reflects slower metabolism and a higher blood level from each tablet.
Stable On An Alpha-Blocker
Stay at the 5 mg entry point. Keep the alpha-blocker dose steady for a while before you add vardenafil. If you already use vardenafil and later start an alpha-blocker, your clinician will usually begin that new med at a low dose to limit light-headedness.
Taking A Strong Or Moderate CYP3A4 Inhibitor
Use the caps listed earlier and space doses exactly as instructed. These drug combinations can push levels up sharply, so smaller tablets and longer gaps keep things steady.
Alcohol, Food, And Everyday Habits
A glass of wine or a beer is usually fine, but heavy drinking raises the chance of dizziness and weakens erectile response. A large, fatty meal can slow absorption, so plan your timing around big dinners. Grapefruit juice may boost drug levels; skip it on dose days if you can.
Storage, Travel, And Discretion
Keep tablets in a dry spot at room temperature. Store them out of reach of kids. When traveling, carry the original labeled bottle in your hand luggage. Heat and humidity in checked bags can be rough on blister packs and bottles.
Common Mistakes To Avoid
- Doubling up after a weak response the same day. Wait for the next day to adjust.
- Mixing with nitrates or riociguat. That pairing is unsafe.
- Switching between dissolving and standard tablets without a new prescription.
- Taking with heavy alcohol intake, then blaming the tablet for a poor result.
- Ignoring new meds like certain antibiotics or antifungals that can change the safe range.
When To Call Your Prescriber
Reach out if headaches, flushing, or reflux make dosing tough, if your erections stay weak after several good tries, or if you feel dizzy with standing. Share your full med list, including any new antibiotics, antifungals, HIV drugs, or grapefruit intake, since these can raise levels and trigger the dose caps above.
Bottom Line Dose You Can Trust
Start near the middle, adjust up or down with care, and respect the one-dose-per-day rule. With the right timing and a dose matched to your health and other meds, most men land on a steady plan that works.