# Vardenafil (Levitra, Staxyn): When the Third Option Is the Right One

> Vardenafil is the least-prescribed of the mainstream ED tablets, which says more about marketing than about the molecule. It is a reasonable switch when sildenafil disappoints or its side effects are intolerable.

- **Source:** ED Treatment Guides (https://www.edtreatmentguides.com/treatments/vardenafil)
- **Last updated:** 2025-11-18
- **Type:** treatment
- **Category:** Oral medication
- **Prescription:** Prescription only
- **Evidence:** Strong evidence
- **Onset:** 30–60 minutes
- **Duration:** 4–8 hours
- **Typical US cash cost:** $20–$80 per month (generic) · brand pricing varies widely
- **Best for:** Men who responded partially to sildenafil; Men who found sildenafil's visual side effects intolerable; People who prefer an orally disintegrating tablet (Staxyn)
- **Not for:** Anyone taking nitrates or riociguat; People taking class IA or class III antiarrhythmic drugs; Anyone with congenital long QT syndrome
- **Common side effects:** Headache; Facial flushing; Nasal congestion; Indigestion; Dizziness

## Key points

- Vardenafil is roughly as effective as sildenafil and works over a similar timeframe.
- It is slightly more selective for PDE5 over the retinal enzyme, so visual side effects are less common than with sildenafil.
- It carries a QT-interval signal that sildenafil and tadalafil do not, which rules it out for people on certain heart-rhythm drugs.
- An orally disintegrating form (Staxyn) dissolves on the tongue — but it is **not** interchangeable milligram-for-milligram with the swallowed tablet.
- Availability and pricing are less consistent than for sildenafil and tadalafil.

## 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**

| Form | Doses | Notes |
| --- | --- | --- |
| Film-coated tablet (Levitra and generics) | 2.5, 5, 10, 20 mg | Usual start is 10 mg, taken about 60 minutes before sex, once daily maximum. |
| Orally disintegrating tablet (Staxyn) | 10 mg only | Dissolves on the tongue without water. Produces higher blood levels than the 10 mg swallowed tablet — the two are **not** interchangeable. |

> **Do not swap forms without advice**
>
> Because the orally disintegrating tablet is absorbed differently, switching between it and the film-coated tablet at the 'same' strength changes your actual exposure. Only your prescriber should make that change.

- 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.

> **The one thing that sets vardenafil apart**
>
> Vardenafil can modestly prolong the heart's QT interval. It should be avoided in anyone with congenital long QT syndrome and in anyone taking class IA antiarrhythmics (such as quinidine or procainamide) or class III antiarrhythmics (such as amiodarone or sotalol). If you take any heart-rhythm medication, tell your prescriber before vardenafil is considered.

> **Get emergency care**
>
> An erection lasting longer than **4 hours** (priapism) is a medical emergency and needs an emergency department, not a phone call. Sudden loss of vision or hearing after a dose also needs same-day medical attention.

## Who should not take it

> **Absolute contraindication**
>
> Never combine any PDE5 inhibitor with nitrate medication — nitroglycerin tablets or spray, isosorbide mononitrate or dinitrate, or recreational 'poppers' (amyl/butyl nitrite). The combination can cause a sudden, dangerous drop in blood pressure. It is also contraindicated with riociguat (Adempas). If you take nitrates for chest pain, tell every prescriber before starting an ED medication. [Read the full safety guide](https://www.edtreatmentguides.com/guides/pde5-safety).

- 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.

> **Tip**
>
> If your pharmacy cannot source it, ask them to check other branches or a mail-order option before you give up on the molecule.

## 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

- U.S. Food and Drug Administration. [Drugs@FDA — approved drug products and prescribing information](https://www.accessdata.fda.gov/scripts/cder/daf/)
- American Urological Association. [Erectile Dysfunction: AUA Guideline](https://www.auanet.org/guidelines-and-quality/guidelines/erectile-dysfunction-(ed)-guideline) (2018)
- MedlinePlus (National Library of Medicine). [Drugs, Herbs and Supplements](https://medlineplus.gov/druginformation.html)

## Related pages

- [Sildenafil (Viagra): How It Works, Dosing, Cost and Side Effects](https://www.edtreatmentguides.com/treatments/sildenafil)
- [Avanafil (Stendra): The Fastest-Acting ED Tablet](https://www.edtreatmentguides.com/treatments/avanafil)
- [PDE5 Inhibitor Safety: Interactions, Contraindications and Emergencies](https://www.edtreatmentguides.com/guides/pde5-safety)
- [ED Medication Side Effects, Explained and Managed](https://www.edtreatmentguides.com/guides/side-effects)

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_This page is general health information, not medical advice. It cannot account for your own history, medications or risk factors. Talk to a licensed clinician before starting, stopping or changing any treatment._

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