What to Take Instead of Sildenafil When It Is Not Working

Before changing anything, one figure is worth knowing. In the clinical studies, 40.8% of men reported improvement after the first dose of sildenafil, rising to 78.4% across repeated attempts. Some men who did not report improvement after the first dose responded after several further attempts.

That matters because most searches for an alternative happen after one or two disappointing attempts, and a genuine non-response is a different problem from an early one.

This page covers both. It sets out what to check before switching, what the other licensed treatments actually are, what the evidence says about each of them, and where the honest limits of that evidence lie. Some of the treatments named in these searches are not licensed medicines at all, and this page says so plainly rather than steering around it.

Key things to know

• A first attempt is not a fair test. Response rose from 40.8% after one dose to 78.4% across repeated attempts in the studies
• Food and alcohol change the result. A high-fat meal delays peak concentration by around 60 minutes and reduces it by around 29%
• The underlying cause changes what works. In the studies, response was 84% where the cause was psychological and 59% in men with diabetes
• Other tablets in the same class exist, and they differ in how long they act rather than in how they work
• Licensed non-tablet options exist: alprostadil injection and vacuum devices
• No herbal or over-the-counter product is a licensed alternative, and the MHRA seized around 19.5 million doses of illegally traded erection pills between 2021 and 2025
• Treatment suitability depends on an individual clinical assessment

Check These Before Switching

A disappointing first attempt does not necessarily mean sildenafil is ineffective. Timing, food, alcohol, stimulation and other factors can all affect the result.

Work through this list before concluding that you need an alternative. Each item is documented in the product information rather than being general advice.

1. How many times have you tried? Response rose from 40.8% after the first dose to 78.4% across repeated attempts in the fixed dose studies
2. Have you eaten? A high-fat meal delays peak plasma concentration by around 60 minutes and reduces it by around 29%
3. Have you been drinking? Drinking too much alcohol can temporarily reduce the ability to get an erection
4. How long did you wait? Peak plasma concentrations are reached within 30 to 120 minutes, with a median of 60 minutes
5. Is the strength right? That is a question for your prescriber, not something to change yourself

If several of those applied, you have not yet had a fair test of the medicine. Report what happened to your prescriber, including the timing, rather than switching on the basis of an attempt that was working against the pharmacology.

What Genuine Non-Response Looks Like

Persistent lack of benefit after several appropriately timed attempts should prompt a review with a prescriber, rather than an assumption that another treatment is automatically needed.

That is a clinical finding rather than a disappointment, and it changes the conversation. It is a reason to look at what is causing the difficulty, not only at which tablet to try next.

Individual variation is also large. The mean absolute oral bioavailability of sildenafil is 41%, with a range of 25 to 63% between people.

Why the Cause Matters More Than the Tablet

Response rates in the studies differed sharply by cause. Where the difficulty was psychological in origin, 84% of men reported improvement. In men with diabetes, the figure was 59%.

These differences show why identifying the underlying cause can be important when sildenafil is not working as expected.

Circulatory disease, diabetes, hormonal problems, nerve damage, medicines taken for other conditions and mental health conditions all produce erectile difficulty, and they do not all respond to the same approach. An online consultation with UK registered prescribers is where that gets assessed.

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Other Tablets in the Same Class

There are other licensed oral medicines in the same class, and they work by the same mechanism. What differs between them is timing.

All of them are phosphodiesterase type 5 inhibitors. They block an enzyme called PDE5, which allows the smooth muscle in the local blood vessels to relax, letting blood flow into the tissue more easily. None of them works without the body's own natural signalling being present.

What Changing Tablet Does and Does Not Change

Changing to a different tablet in the same class changes the timing you work with. It does not change the mechanism, and it does not change the safety exclusions.

PDE5 inhibitors have important contraindications and interactions, particularly with nitrates and certain nitric oxide donors. The specific contraindications should be checked for the individual medicine. Low blood pressure, certain cardiovascular conditions and other medicines may make a PDE5 inhibitor unsuitable, and the individual product information and clinical assessment should be followed.

It also does not reset the question of cause. If a circulatory or hormonal problem is driving the difficulty, a different PDE5 inhibitor is working against the same obstacle.

A longer acting option does suit some people better, because it removes the need to plan around a narrow window. Your prescriber will determine the appropriate treatment. The full range of licensed options is on the erectile dysfunction treatments page.

Non-Tablet Options

Alprostadil Injection

Alprostadil is licensed in an injectable form, given directly into the erectile tissue. It works differently from the tablets, acting locally on the blood vessels rather than through the PDE5 pathway, which is why it can be an option where an oral medicine has not worked.

Intracavernosal alprostadil can be highly effective in men who do not respond adequately to oral treatment.

Two things are usually underestimated.

The first is that it requires training. A prescriber or nurse teaches the technique before anyone uses it independently, and that teaching is part of the treatment rather than an optional extra.

The second is that the prolonged erection risk is real, and it is the reason the training exists. An erection lasting more than 4 hours needs urgent medical attention, because delay can cause permanent worsening of erectile function.

Injection is not something to obtain outside a proper clinical route. The technique, the strength and the monitoring are all part of the prescription.

Vacuum Devices

A vacuum erection device, often called a penis pump, is a mechanical option rather than a medicine. A cylinder is placed over the penis and air is drawn out, which draws blood into the tissue, and a constriction ring is then used to maintain it.

Because it does not use a systemic medicine, it avoids the interactions associated with PDE5 inhibitors, including their interaction with nitrates.

Devices sold as vacuum pumps vary widely in quality, and buying one without clinical input is where people go wrong. Ask a prescriber before buying rather than after.

The Options Compared

The last row is the one most pages leave out, and it is often the one that changes the outcome.

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Lifestyle Changes

Lifestyle change is the slowest route and the one with the widest effect, because the same factors that damage circulation everywhere damage it here.

Four areas have the clearest link:

• Circulatory health. Blood pressure, cholesterol and blood sugar control affect the blood vessels that erectile function depends on
• Alcohol. Excessive alcohol can temporarily reduce the ability to get an erection, and sustained heavy drinking has wider effects
• Smoking. It damages blood vessels directly and reduces blood flow
• Weight and activity. Maintaining a healthy weight and regular physical activity can improve cardiovascular health, and may improve erectile function where vascular risk factors are contributing

None of these produces a result on the evening you start, which is exactly why they get skipped. They also do not compete with treatment, and improving them can improve how well a medicine works.

There is a further reason to take this seriously. Erectile difficulty can be an early sign of circulatory disease or other underlying conditions, sometimes appearing before anything else does. The product information for sildenafil notes that it is important to have a check-up with a prescriber within the first 6 months of use, and that reflects the fact that this symptom deserves investigation in its own right.

Other Approaches Worth Discussing

Pelvic floor muscle exercises may improve erectile function in some men, particularly where pelvic floor weakness is contributing.

Psychosexual therapy can also help where performance anxiety or other psychological factors are involved. Given that response in the studies was highest where the cause was psychological, this is worth raising rather than treating as a last resort.

Treatments That Are Not Licensed Alternatives

Shockwave Therapy

Low intensity shockwave therapy is not a licensed medicine, and it is not an established routine treatment for erectile dysfunction in the UK.

It is offered privately by some clinics, and the way it is marketed often runs well ahead of what the evidence supports. NICE has published interventional procedures guidance on extracorporeal shockwave therapy for Peyronie's disease, which is a different condition, and that guidance should not be read as an endorsement for erectile difficulty.

If you are considering it, three questions are worth asking whoever is offering it: what the licensed status of the device is, what evidence they are relying on for erectile dysfunction specifically, and what happens if it does not work. Vague answers to any of those are informative.

Herbal and Natural Products

There is no licensed herbal or natural product that can be presented as an equivalent to prescription treatment, and products sold through unregulated channels can carry significant risks.

The MHRA's enforcement figures set out the scale. Nearly 20 million illegally traded erectile dysfunction pills were seized in five years, with 4.4 million in 2025 alone, and around 19.5 million doses seized between 2021 and 2025.

One point deserves emphasis. Somebody taking a nitrate who buys a herbal product containing undeclared sildenafil is taking a combination that is absolutely contraindicated, without knowing it.

The MHRA's advice is to use only UK-registered pharmacies, and to avoid buying medicines from social media, messaging apps or unknown websites. A medicine that does not come from a registered pharmacy is not safe, and supplying it that way is unlawful.

How the Decision Is Actually Made

There is no single option that is right for everyone, and any page claiming otherwise is selling something. What exists is a sequence of questions that narrows it down.

1. Was the tablet given a fair trial? Repeated attempts, appropriate strength, without food or alcohol working against it
2. What is causing the difficulty? Circulatory, hormonal, neurological, medicine related, psychological, or a combination
3. What else are you taking? Some medicines prescribed for other conditions contribute to erectile difficulty
4. What are you willing to use? An option you will not actually use is not a treatment
5. What are the exclusions? Nitrate use, cardiovascular status and other conditions rule some options out entirely

That sequence is what a proper assessment works through. It is also why "what should I take instead" cannot be answered by a web page, however detailed. Your prescriber will determine the appropriate treatment, and results vary between individuals.

Red Flags That Need Medical Attention

• An erection lasting longer than 4 hours. Urgent. Delay can cause permanent worsening of erectile function
• Chest pain during or after any attempt. Never treat this with a nitrate if you have taken a PDE5 inhibitor
• Sudden decrease or loss of vision, or of hearing. Stop and seek medical attention
• Fainting or collapse
• Erectile difficulty appearing suddenly alongside other symptoms, which warrants assessment for an underlying cause

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