A substantial share of "it did not work" turns out to be a trial that was never going to work. Before changing anything, check all of the following:
- Was the dose adequate? Starting doses are conservative and often need increasing.
- Was there enough lead time? Sildenafil and vardenafil generally need 30 to 60 minutes.
- Was there a heavy meal? Fatty food markedly delays sildenafil.
- Was there significant alcohol? Alcohol suppresses the arousal response the medicine depends on.
- Was there sexual stimulation? These medicines do not produce an erection on their own. This is genuinely not obvious to everyone.
- How many attempts? Guidance generally suggests several attempts at an adequate dose before judging.
Then Consider the Dose
If the trial was fair, a dose increase is often the next step — sildenafil from 50mg to 100mg, for instance. This is a prescriber's decision, and doses have ceilings for good reason. Do not self-escalate.
Then Consider Switching
Response to PDE5 inhibitors is individual, and failure on one does not predict failure on another. Switching between sildenafil, tadalafil, vardenafil and avanafil is a standard next move. Tadalafil in particular suits people whose difficulty is partly about timing pressure, because the long window removes the clock-watching.
Tadalafil also comes as a low daily dose taken continuously rather than before sex. For some people, that changes the experience more than any dose increase does.
Then Look Underneath
If several medicines at adequate doses have genuinely failed, the question changes from "which tablet" to "what is causing this".
- Diabetes, particularly if undiagnosed or poorly controlled, is a common reason for poor response
- Low testosterone can blunt the response — a blood test settles it
- Cardiovascular disease reduces the blood flow the medicine works with
- Medicines you take for other conditions may be contributing
- Nerve damage, including after prostate surgery, is a different problem with different answers
- Psychological factors, including performance anxiety, which can defeat a perfectly effective medicine
The Anxiety Loop
Once someone has had a bad experience, anticipating a repeat becomes its own cause. The medicine works pharmacologically and fails situationally, which is confusing and demoralising.
The tell is variability: if erections occur on waking or during masturbation but not with a partner, the mechanism is intact and the barrier is psychological. That is treatable, often more effectively than by adjusting a dose. Psychosexual therapy has a good evidence base and is available on the NHS in many areas.
Beyond Tablets
If oral medicines are genuinely not working, other options exist and are not last resorts:
- Vacuum erection devices — no drug interactions, work mechanically
- Alprostadil, as an injection or urethral pellet
- Penile implants, for a small group where other options have failed
These need a doctor, and typically a urology referral.
Do Not Escalate on Your Own
The tempting response to a failed attempt is more tablets, a bigger dose, or a stronger product from a less careful supplier. That is the route the counterfeit market depends on. The productive response is a conversation with a prescriber about why it is not working — because in most cases there is an answer, and it is usually not "nothing works".