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What is Sildenafil?

Sildenafil is the generic version of the brand name drug Viagra and is used for treating erectile dysfunction (ED). The active ingredient in Sildenafil is sildenafil citrate, which is the same active ingredient as in Viagra. Sildenafil citrate works by relaxing the blood vessels in the penis and allowing increased blood flow when sexually stimulated.


You can buy Sildenafil and Viagra online from a UK pharmacy online here.

Do not store above 30°C
Take this medication as prescribed
Do not use after the expiration date

How does Sildenafil work?

Sildenafil citrate belongs to a group of medicines called phosphodiesterase type 5 (PDE 5) inhibitors. It works by helping to relax the blood vessels in your penis, which allows blood to flow into your penis when you get sexually excited. Sildenafil will only help you get an erection if you are sexually stimulated.

How do you take Sildenafil?

The recommended starting dose is 50 mg. One tablet should be taken one hour before sexual activity. It takes 30-60 minutes for Sildenafil to work. Sildenafil can last up to 4 hours.


Do not exceed one tablet per day.


Heavy meals or food may slow down the absorption and the action of Sildenafil.

How effective is Sildenafil in treating erectile dysfunction?

Sildenafil is an effective way to manage erectile dysfunction. Both Sildenafil and Viagra work for 4 out of 5 men. It is important to note that Sildenafil might not work the first few times that it is taken. Some men find that Sildenafil begins to work for them after the 4th or 5th time they have taken this medication.

What are the common side effects of Sildenafil?

Like all medicines, Sildenafil can cause side effects. However, not everyone experiences side effects. Side effects of Sildenafil are typically mild to moderate and only last a short duration.


The most common side effects include:

  • Headache
  • Nausea
  • Hot facial and/or body flush


For a list of less frequent side effects, please see the patient information leaflet.

* Disclaimer: Results and individual responses to treatments may vary from person to person. If you do need medical advice you should always speak to a doctor, pharmacist or appropriate medical professional.