When a third molecule is the right move

Guidelines are clear that switching molecules within the PDE5 class is worth trying before concluding oral treatment has failed. Some men respond considerably better to one than another, for reasons that are not well understood, and side-effect profiles differ meaningfully.

  • Partial or inconsistent response to sildenafil at maximum tolerated dose, after four to eight proper attempts.
  • Visual side effects on sildenafil — vardenafil is more selective and rarely causes them.
  • Persistent headache on sildenafil that a dose reduction did not solve.

If nothing in this class has worked after two genuine trials, the next step is not a third tablet — see when medication fails.

The caution that sets vardenafil apart

Every other PDE5 contraindication applies equally, starting with nitrates. Run the two-minute safety check before ordering.

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FAQ

Frequently asked questions

Is vardenafil stronger than sildenafil?
It is more potent per milligram in the laboratory, which is why the doses are lower — but in practice the two produce similar results. Its value is as an alternative, not an upgrade.
Why is vardenafil hard to find?
It is stocked less consistently than sildenafil and tadalafil, and most telehealth services do not carry it at all.
Who should not take it?
Anyone on nitrates, plus anyone with congenital long QT syndrome or taking class IA or class III antiarrhythmic medication.
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.