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Sildenafil contains exactly the same active ingredient as Viagra (sildenafil citrate) and is a cheaper, reliable ED treatment. You can order Sildenafil for collection or delivery from our online clinic.

Sildenafil citrate 25mg | from £2.81 per tablet

Sildenafil 25mg - Erectile Dysfunction Treatment

Sildenafil citrate 50mg | from £3.75 per tablet

Sildenafil 50mg - Erectile Dysfunction Treatment

Sildenafil citrate 100mg | from £4.69 per tablet

Sildenafil 100mg - Erectile Dysfunction Treatment

Key Features
  • The same active ingredient as Viagra
  • Cheaper than Viagra but works in the same way
  • Effective within one hour and can last from four to five hours
Sildenafil has the same active ingredient as Viagra and has helped millions of men.
Amanda Dorkes - Clinical Director

Key Information

The medicine

Sildenafil (sildenafil citrate)

Taking sildenafil

Take one tablet one hour before sex. Sildenafil works best when taken on an empty stomach. Positive effects can last for four to six hours.

Never take more than one tablet within a 24 hour period. Avoid taking Sildenafil tablets with more than one or two units of alcohol as alcohol can limit its effectiveness.

How it works

Sildenafil citrate works by increasing blood flow to the erectile tissue of the penis. Sildenafil does not have an effect on your sexual desire, but will improve your erection when you become sexually aroused.


The majority of men will notice a firmer and longer-lasting erection. If you find that the treatment does not work, ask our doctors whether it would be appropriate to increase the dose or to try a different medicine.

If Sildenafil doesn’t work for you first time round, it could nevertheless be more effective next time. Indeed, doctors advise trying all erectile dysfunction medicines eight times before giving up.

Side effects

Side effects are uncommon, but can include nausea, vomiting, diarrhoea and an allergic rash. It can also cause facial flushing, headache, light headedness, nasal congestion, indigestion, a pounding heartbeat and blurred vision.

Nitrates and Sildenafil

Our doctors will not be able to prescribe Sildenafil if you are taking nicorandil or nitrates, such as GTN spray or isosorbide mononitrate tablets to treat angina.

Alpha-blockers and Sildenafil

If you are taking alpha-blockers, our doctors will advise that you leave at least six hours between taking your alpha-blocker and taking Sildenafil.

About Sildenafil

How quickly does Sildenafil take effect?

Sildenafil takes effect within an hour of being consumed. It should then be effective in helping you to get and maintain an erection for 4 to 6 hours. However, the speed and efficiency of Sildenafil does depend upon how much food you have had to eat, as well as your alcohol consumption. For best results, take it without food (or with a low-fat meal) and without alcohol, and allow an hour for it to take effect.

Does Sildenafil treat the underlying causes of erectile dysfunction?

Sildenafil will not treat the physical causes of your erectile dysfunction. However, if your condition is the result of anxiety (or other psychological issues), successful use of Sildenafil may boost your personal confidence and decrease the likelihood of anxiety-induced erectile dysfunction. In many men, erectile dysfunction is the first sign of a medical problem, such as high blood pressure or diabetes. It’s important, especially in men over the age of 40, to have these conditions looked for by blood testing and physical examination. Treatment of these other conditions is important for your overall health, as well as your sexual health. 

Alternative Treatments

Other Medicines

Key InformationBest known treatmentFast and longest actingRecommended for diabeticsTargeted and fast acting


Psychological Therapy

Some men may want to try counselling to treat psychological causes of erectile dysfunction. If you wish to try counselling then some sexual health clinics (also known as GUM clinics) offer this service. Alternatively we have partnered with Thinkwell to offer private online counselling. Click here to find out more about this service.

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