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What is Sildenafil?

Sildenafil is the active ingredient in Viagra, which is a prescription medication used for the treatment of erectile dysfunction. Sildenafil is now off-patent so generic versions are able to be prescribed legally in the UK. This has led to significant price reductions so we are able to prescribe this at significant discounts to the branded version. Prices depend on dosage and quantity and the full price list is available when you register. We are very confident that our prices represent excellent value and we will happily price match another website if they are appropriately licensed and providing an identical service for a cheaper price.

Can I Buy Sildenafil?

The Online Clinic can now prescribe a range of versions of Sildenafil, including: Viagra and generic Sildenafil from other manufacturers who have received a license from the Medicines and Healthcare Regulatory Agency. Any generic products prescribed by us are appropriately licensed and manufactured to British Manufacturing Standards. Click on the free consultation button to begin.

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How does Sildenafil work?

Sildenafil inhibits the action of an enzyme found in the body that causes blood vessels to narrow (PDE5), thereby allowing men to achieve erections, which ultimately rely on blood vessels being able to expand. Levitra and Cialis are also PDE5 inhibitors but have different active ingredients: Vardenafil and Tadalafil respectively.

Sildenafil, like the other PDE5 inhibitors, prevents the function of the PDE5 enzyme and widens blood vessels and improves blood flow. After sexual stimulation, blood flow to the penis is enabled and helps to achieve and maintain an erection.

When do I take Sildenafil?

The doctor will prescribe Sildenafil in dosages of 25 mg, 50 mg or 100 mg. 50 mg is the normal starting dose. Sildenafil should be taken one hour before intercourse and it can remain active for up to 4 hours. This does not suggest that an erection will last for 4 hours but where there is sexual stimulation, an erection can be achieved within this period of time. Where an erection lasts for more than 4 hours, medical help should be sought as this is known as priapism and can cause long term or permanent damage to muscle tissue in the penis.

Is this treatment suitable for me?

Sildenafil tablets should only be taken by those who suffer from erectile dysfunction and it should only be taken under medical supervision, i.e. on prescription. Getting this treatment via websites like The Online Clinic will ensure that you are only prescribed this medication if it is clinically appropriate and you can be sure that you are getting a genuine product. You can read further information about Sildenafil at this location.

Are there any side effects?

As with all prescription treatments, some patients will experience side effects. What is important to note is that not all patients will get side effects – most do not. Side effects can include headache, flushing, dizziness, congested nose and vision disorders.

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Reviewed by: Dr Joyce Braaksma
GMC registration number: 4621289
Date: 10 March 2022
Next review: 11 March 2024
All UK registered doctors can have their registration checked on
The Medical Register at the GMC website.

Sildenafil Reviews By Our Patients

  • Overall Rating
    Based on 7 reviews
  • ★★★★★
    Works as described and delivery service fast and efficient
    D. C. - 14/01/20
  • ★★★★★
    always a good response
    R. S. - 06/04/23
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    very reliable, and less expensive that viagra (of which it's a clone)
    anon - 13/01/20
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    Great product. Saved my life
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    aLL OK
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    Good product and fast delivery
    Matthew Lewis - 10/04/20

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