The tablets didn't work

What counts as a fair trial?

A single tablet is not a definitive test. Dose, timing, sexual stimulation, food—particularly with sildenafil—alcohol, anxiety and whether the drug was taken on enough separate occasions all affect response. The maximum tolerated licensed dose may be required, and switching to a different PDE5 inhibitor or a daily tadalafil strategy can sometimes help.

Why does sexual stimulation still matter?

PDE5 inhibitors amplify the nitric-oxide pathway; they do not create sexual desire or an automatic erection. Without arousal, the biochemical signal they amplify may be weak.

What if I really am a non-responder?

True non-response is more common with severe vascular disease, advanced diabetes, major nerve injury after pelvic surgery, severe penile fibrosis or profound erectile dysfunction. Next-line treatments include vacuum erection devices, intraurethral or intracavernosal alprostadil and, where appropriate, penile prosthesis surgery.¹

Should I combine treatments myself?

No. Some combinations are used by specialists, but unsupervised dose escalation or mixing erectile drugs can create unnecessary side effects and drug-interaction risk.

Does “tablet failure” mean the condition is hopeless?

No. It means the treatment pathway should be reviewed: confirm diagnosis, optimise modifiable contributors, check how the drug was used, then move systematically to the next evidence-based option.

What counts as a fair trial in the UK?

The British Society for Sexual Medicine puts a number on it, which almost no consumer-facing page does: a minimum of four doses, preferably eight, at the maximum tolerated dose, of at least two different drugs in sequence before the class is declared a failure.

The European guideline is blunter still about why this matters, issuing a strong recommendation that patients be fully informed how these drugs work and how to take them, because incorrect use and inadequate information are the main cause of apparent non-response.

If nobody has told you that, you have not yet had a fair trial.

Bottom line

Before declaring sildenafil or tadalafil ineffective, make sure it had a genuine clinical trial. If it still fails, there are several effective second- and third-line treatments. “The tablets didn’t work” is a treatment-stage description—not an endpoint.

Before I accept that a drug has failed, I want to know the dose, whether it was taken on an empty stomach, how many separate occasions it was tried, and whether a second drug was tried at all. That is not scepticism about your account — it is the commonest fixable problem in this clinic, and it costs nothing to correct.