Sildenafil is a treatment for ED containing the same active ingredient as Viagra. Buy from Click Pharmacy today for a safe & secure service from UK's leading online


6/23/2025 4:43:40 PM


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Sildenafil Tablets

Sildenafil is a prescription medication primarily used to treat erectile dysfunction in men.

Medication features:

  • Available as a generic drug
  • Active ingredient of Viagra
  • Medically equivalent to Viagra

Next Day Delivery Available

UK Registered Pharmacy

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Expected Delivery: Tuesday

If you order within: 12h36m

Sildenafil Prices

  • Medicine prices
  • Delivery Information
Medicine 4 tablets 8 tablets 12 tablets 24 tablets 28 tablets
Sildenafil 25 mg £9.99 £17.99 £23.99 £44.99 £49.99
Sildenafil 50 mg £9.99 £17.99 £23.99 £44.99 £49.99
Sildenafil 100 mg £9.99 £17.99 £23.99 £44.99 £49.99

Prices include free private prescription.

Delivery charges

Orders approved by our medical team before 3pm Monday – Friday are dispatched the same day via Royal mail. All orders are sent using a tracked and signed for service. Orders are not dispatched on weekends and bank holidays.

Royal Mail 1st Class | £3.95

Delivered within 1-3 working days. Excludes bank holidays. A tracked service with signature required on delivery.

Royal Mail Special Delivery Guaranteed before 1pm | £6.95

Delivered within 1 working day before 1pm. Excludes Sundays and bank holidays. A tracked service with signature required on delivery.

Find out more about our delivery service.

Refunds and returns – Read further information on return and refunds.

  • Overview
  • Directions
  • Cautions
  • FAQ

Buy Sildenafil Online UK

You can order Sildenafil online in the UK from our registered pharmacy. Complete the online medical assessment to be reviewed by one of our prescribers. If approved, your medication will be dispensed by our pharmacy team for next day delivery to your address. 

About Sildenafil

Used in the treatment of erectile dysfunction (ED), Sildenafil belongs to a group of medicines called PDE5 inhibitors. These drugs prevent an enzyme called phosphodiesterase type-5 from working too fast. In turn, this makes it easier to get and maintain an erection during sexual stimulation. Note that any patients suffering from cardiovascular disease should consult a physician before using this treatment or related medicines.

Sildenafil Summary Information

Type of medicine

Erectile dysfunction treatment


Helps in achieving and maintaining an erection

How it works

Works by increasing blood flow to the penis, facilitating erection

Active Ingredient

Sildenafil citrate

Directions of use

take orally, as needed, approximately 30 minutes to 1 hour before sexual activity with a full glass of water

Available strengths

25 mg, 50 mg, and 100 mg

Side effects

Common side effects include headaches, heartburn, flushed skin, nasal congestion, indigestion, nausea, vomiting and diarrhoea



The information provided in the summary table is for reference only. It is important to consult a qualified healthcare professional before starting any erectile dysfunction treatment, including Sildenafil.

How effective is Sildenafil

The dose used in each patient's situation can ensure greater or less effectiveness depending on what someone desires to achieve from their treatment. For example, some may prefer to be able to use one tablet daily, whereas others may prefer or require a lower dose, such as those having more side effects from the treatment or an older patient or those with poor underlying health issues. Whatever your require, there are different doses of the product which can be used to benefit your personal situation.

It has been clearly shown to be effective for patients with severe ED, and as such, it also appears from studies that Sildenafil also improves the quality of the patient's relationship with their sexual partner overall.

How does Sildenafil work?

The medicine works by relaxing the muscles in the veins that carry blood to the penis by preventing the action of a certain natural chemical called phosphodiesterase type-5. By doing this, it promotes increased blood flow, making it possible to get an erection during sexual activity. Contrary to popular belief, the treatment does not cause spontaneous erections or have any effect on your sexual desire; instead, you must be sexually aroused to get an erection using Sildenafil.

It is important to be aware that PDE5 inhibitors do not treat the underlying causes of ED, which can include physical problems such as diabetes and high blood pressure and psychological issues like anxiety and depression. Because of this, it is important to seek medical advice to find out why you are experiencing ED.

What does Sildenafil contain?

The active ingredient is Sildenafil citrate in doses of 25mg, 50mg and 100mg per tablet.

The inactive ingredients are:

  • microcrystalline cellulose
  • anhydrous dibasic calcium phosphate
  • croscarmellose sodium
  • magnesium stearate
  • hypromellose
  • titanium dioxide
  • lactose monohydrate
  • triacetin

What is the difference between Sildenafil and Viagra?

In medical terms, Sildenafil and Viagra are the same things. Viagra is the brand name of Sildenafil. Sildenafil is the active ingredient in 'Viagra'. They are interchangeable and can be found in packs of 4 and 8 tablets. You can find both in strengths of 25mg, 50mg, and 100mg.


What dose should I choose?

The treatment comes in tablet form, and you should never take more than one within a 24-hour period.

There are three available dosages, 25mg, 50mg and 100mg, and whilst the higher dose can increase the effectiveness of the treatment, the lower dose can incur fewer side effects.

For further information on dosages, you can speak to your doctor or consult one of our knowledgeable healthcare professionals at Click Pharmacy.

How should I take Sildenafil?

The drug usually works best when taken an hour before sexual activity though it can be taken anywhere between 4 hours and 30 minutes before intercourse. It is most effective when consumed on an empty stomach and without alcohol, and certainly, if you do eat prior to taking it, then bear in mind that a high-fat meal will negatively affect its ability to work. Once taken, it can carry on working for between four and six hours.

Side effects

As with all medicines, there are potential side effects to consider. The most common include headaches, heartburn, flushed skin, nasal congestion, indigestion, nausea, vomiting and diarrhoea. Also, note that the treatment should never be taken with nitrates because it can cause a serious and potentially fatal drop in blood pressure.

Taking too much and overdosing can be highly dangerous and will not increase the desired effects of the treatment. But it can result in side effects such as chest pains, an irregular heart rate, nausea and priapism which is an erection which cannot subside. If left untreated, priapism can lead to permanent damage and future issues with achieving an erection. If this occurs, seek medical support right away.

For further information on these issues or if your treatment does not work satisfactorily, contact your GP or consult our specialists.

Can I drink alcohol while taking Sildenafil?

Drinking alcohol should be avoided as both alcohol and sildenafil lower blood pressure which could lead to extreme dizziness and feeling faint.

Why is Sildenafil cheaper than Viagra?

In 2013 Viagra lost its UK patent, meaning new and similar drugs were formulated. Sildenafil was one of the new drugs, so it is considerably cheaper despite it containing the same ingredients.

Sildenafil Reviews

How to order medications from us

Order your medication in a few clicks. Our process is easy, fast and secure.

Step 1

Short Medical Assessment

Fill out a questionnaire so our prescriber can assess if the treatment is suitable for you.

Step 2

Select Preferred Medication

Choose the medication you require from the range offered by our online pharmacy.

Step 3

Next Day

Add delivery details and complete payment process.

Price £9.99

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Available strengths:

25 mg 50 mg 100 mg


Price £9.99

Includes free private prescriptions

In stock

2024/06/23 2024/06/24

Order before 15:00pm (Monday to Friday) for next day delivery