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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.
Dr Clyde Mackey

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 (Generic Viagra)

What is Sildenafil?

Sildenafil is a prescription-only tablet used to treat erectile dysfunction (also known as impotence). It is the generic form of the medicine Viagra, containing the same active ingredient (sildenafil citrate). 

Each tablet may have a slightly different imprint depending upon the manufacturer. They will also be either white or blue, often with the specific dosage printed on one side as well.

Does Sildenafil treat the underlying causes of erectile dysfunction?

Sildenafil will not treat any long-term physical causes of your erectile dysfunction. However, for some men with ED, the underlying cause might be psychological in nature. 

Anxiety, relationship problems with your sexual partner, body confidence issues and other psychological causes can all make it more difficult to get an erection. In these cases, successful use of Sildenafil may boost your personal confidence and decrease the likelihood of erectile dysfunction. Starting to take an ED treatment like Sildenafil can be very helpful and reassuring in itself, leading to improved sexual confidence in the future.

However, 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. Free blood sugar and blood pressure tests can be carried out at most LloydsPharmacy stores.

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. 

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