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Sildenafil - Erectile dysfunction treatment
  • More affordable than Viagra. Works in the same way
  • Works in 1hr, lasts up to 4hrs
  • Works for 60-70% of men

Sildenafil (generic Viagra)

Sildenafil contains the same active ingredient as Viagra (sildenafil citrate) and is a cheaper, reliable ED treatment.

Sildenafil - Erectile dysfunction treatment

Generic treatment

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Returning patient? Reorder

Alternative treatment: Viagra

  • More affordable than Viagra. Works in the same way
  • Works in 1hr, lasts up to 4hrs
  • Works for 60-70% of men

Generic or branded treatments?

Some treatments contain the same active ingredient but are sold under different names. If the active ingredient and the dosage are the same, the treatments will have the same effect and work in the same way. 

Generic Branded
Same active ingredient
Works in the same way
Often less expensive

What is Sildenafil?

  • How to take Sildenafil

    Take one tablet 1hr before sex. Works best on an empty stomach. Effects can last for up to 6hrs. Never take more than one tablet within 24hrs. Alcohol will limit Sildenafil's effectiveness. Do not combine Sildenafil with other ED medicines.

  • How does Sildenafil work?

    Sildenafil's active ingredient (sildenafil citrate) increases blood flow to the penis. It enables a firmer, longer-lasting erection if you are sexually aroused.

    The treatment will not resolve the underlying physical cause of your ED or increase your sexual desire.

  • Sildenafil side effects

    Side effects are uncommon, but can include nausea, vomiting, back pain, diarrhoea and an allergic rash. Some men also experience facial flushing, headaches, light headedness, nasal congestion, indigestion, palpitations (racing heartbeat), and blurred vision.

    For full information on side effects and correct use, see the patient information leaflet.

  • How effective is Sildenafil?

    Sildenafil treats ED in 60-70% of cases. If you have eaten a large meal or drunk more than 1-2 units of alcohol, you may find Sildenafil is less effective.

    We advise trying an ED treatment 8 times before giving up, considering a higher dose or seeking an alternative.

  • What's the ideal dosage of Sildenafil?

    The standard dose is 50mg. Depending on your age, height and weight, the cause and the severity of your ED, you may be prescribed a lower dose of 25mg, or a higher one of 100mg. Dosage does not affect how quickly or for how long the treatment works.

    Higher doses come with an increased chance of developing side effects.

  • What drugs should not be taken with Sildenafil?

    If you are taking alpha-blockers (such as doxazosin or tamsulosin),  you should wait at least 6 hours between taking those and taking Sildenafil.

    You will be unsuitable for Sildenafil if you are taking nicorandil or nitrates, such as GTN spray or isosorbide mononitrate tablets to treat angina.

    It is important that you let us know which prescription, over-the-counter medicines and recreational drugs you are taking so that we can prescribe Sildenafil safely.

  • Are there any alternative treatments for erectile dysfunction?

    Some men find counselling helpful as a means of exploring and treating psychological causes for ED.

    If Sildenafil does not work for you, contact us via your Patient Record so that we can discuss your treatment options. View all our ED treatments.

  • Reordering & subscription

    To reorder Sildenafil, go to your Patient Record and select ‘reorder’. You will be required to fill in the online questionnaire each time you reorder.

    A subscription service is available for Sildenafil. Find out more about our ED treatment subscription service.

Other erectile dysfunction treatments

More advice about erectile dysfunction

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