Where vardenafil fits

Vardenafil is a PDE5 inhibitor with a duration close to sildenafil's — a useful window of roughly four to eight hours. Milligram for milligram it is more potent than sildenafil in the laboratory, which is why the doses are lower, but that does not translate into a meaningfully better clinical result.

The honest summary is that it is a competent alternative rather than an upgrade. Its practical value is as a switch: some men who respond poorly to sildenafil, or who cannot tolerate its headaches or blue-tinged vision, do better on vardenafil. Trying a second molecule in the class before abandoning oral treatment altogether is standard, sensible practice.

Doses and forms

Vardenafil forms
FormDosesNotes
Film-coated tablet (Levitra and generics)2.5, 5, 10, 20 mgUsual start is 10 mg, taken about 60 minutes before sex, once daily maximum.
Orally disintegrating tablet (Staxyn)10 mg onlyDissolves on the tongue without water. Produces higher blood levels than the 10 mg swallowed tablet — the two are not interchangeable.
  • A high-fat meal reduces absorption. Take it on a light stomach.
  • Men over 65 and those with liver impairment usually start at 5 mg.
  • Grapefruit juice raises levels and should be avoided.

Side effects and the QT question

The everyday side effects mirror the rest of the class: headache, flushing, congestion, indigestion. Visual disturbance is less common than with sildenafil.

Who should not take it

  • Anyone on class IA or class III antiarrhythmic medication, or with congenital long QT syndrome.
  • People taking strong CYP3A4 inhibitors — ritonavir is generally a hard stop for the orally disintegrating form.
  • Alpha-blocker users, unless stable and starting at the lowest dose.
  • Severe hepatic impairment; the orally disintegrating tablet is not recommended in this group.
  • Anyone with a recent cardiovascular event or unstable cardiac disease, until cleared.

Cost and availability

Generic vardenafil exists but is stocked less consistently than sildenafil or tadalafil, and cash prices are usually higher. Many telehealth services do not carry it at all. If cost is the deciding factor, generic sildenafil or tadalafil will almost always win; vardenafil earns its place on tolerability, not price.

FAQ

Frequently asked questions

Is vardenafil stronger than sildenafil?
It is more potent per milligram in the laboratory, which is why its doses are lower — but in practice the two produce similar results. 'Stronger' is not the useful way to think about it.
Why would I switch from sildenafil to vardenafil?
Two common reasons: a partial or inconsistent response after a genuine trial at the maximum tolerated dose, or side effects — especially visual ones — that make sildenafil unpleasant.
What is Staxyn?
The 10 mg orally disintegrating form of vardenafil that dissolves on the tongue. Convenient if swallowing tablets is difficult or discreet dosing matters, but not dose-interchangeable with the standard tablet.
Can I take it with heart medication?
Nitrates are an absolute contraindication for the whole class. Vardenafil specifically must also be avoided with class IA and class III antiarrhythmics. Other heart medications need individual review by your prescriber.
Sources

What this is based on

We link to primary sources — clinical guidelines, regulator publications and peer-reviewed research — wherever possible. Links open on third-party sites we do not control.

  1. [01]U.S. Food and Drug Administration. Drugs@FDA — approved drug products and prescribing information.
  2. [02]American Urological Association. Erectile Dysfunction: AUA Guideline (2018).
  3. [03]MedlinePlus (National Library of Medicine). Drugs, Herbs and Supplements.