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As part of the Frosts Pharmacy Group, a family run business established in 1925 by John Frost and now run by his grandson Stuart Gale, we are a fully registered UK pharmacy and adhere to the standards set by the General Pharmaceutical Council. We run successful high street pharmacies in Banbury and Oxford, in the UK, as well as our online chemist services.

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Sildenafil Tablets (25mg, 50mg,100mg)

Sildenafil Tablets (25mg, 50mg,100mg)

£ 5.89 (£1.47 per tablet)

25mg50mg100mg
4 tablets£5.89£8.19£8.19
8 tablets£9.49£13.88£14.95
16 tablets£14.98£22.99£25.95
32 tablets£32.49£41.48£41.98
64 tablets£45.49£63.94£69.98
Medication Oxford Online Pharmacy Pharmica Simple Online Pharmacy Numan MedExpress The Independant Pharmacy Health Express Dr Fox *
25mg x 4 Tablets £5.89 £9.99 £5.89 - £9.99 £6.99 £8.99 £5.90
25mg x 8 Tablets £9.49 £19.99 £9.49 - £19.99 £11.98 £16.99 £9.50
25mg x 16 Tablets £16.99 £34.99 £17.19 - £39.99 £19.96 £28.99 £17.20
25mg x 32 Tablets £32.49 £53.99 £32.49 - £79.99 £33.52 £49.99 £32.50
25mg x 64 Tablets £45.49 £63.36 £45.50 - £89.99 - - £49.50
50mg x 4 Tablets £7.45 £14.99 £7.49 - £16.99 £9.99 £14.99 £7.50
50mg x 8 Tablets £13.88 £26.99 £13.89 £34.00 £29.99 £14.98 £22.99 £13.90
50mg x 16 Tablets £24.98 £44.99 £24.99 £45.00 £49.99 £25.96 £36.99 £26.00
50mg x 32 Tablets £44.48 £80.99 £47.99 - £89.99 £49.92 £69.99 £48.00
50mg x 64 Tablets £63.98 £125.99 £64.94 - £139.99 - - £64.95
100mg x 4 Tablets £8.19 £16.99 £8.19 - £19.99 £9.99 £16.99 £8.20
100mg x 8 Tablets £14.95 £29.99 £15.24 £42.00 £34.99 £14.98 £24.99 £15.25
100mg x 16 Tablets £25.95 £49.99 £25.99 £55.00 £59.99 £25.96 £42.99 £29.00
100mg x 32 Tablets £42.98 £89.99 £49.95 - £99.99 £49.92 £69.99 £53.00
100mg x 64 Tablets £71.98 £139.99 £91.99 - £159.99 - - -

Prices checked on 27 Nov 2023 - If you find a cheaper price call us.

* Doctor Fox has an additional charge for the prescription, the price shown includes the prescription fee.

Sildenafil film-coated tablets (25mg, 50mg, 100mg)

Sildenafil film-coated tablets are a generic Erectile Dysfunction (ED) treatment designed to treat the physical symptoms of ED. For many men, this means being able to achieve stronger, firmer and longer erections.

Get back to feeling like yourself.

Get to know Sildenafil

The Sildenafil film-coated tablet is the generic version of the well-known Viagra brand of ED tablets. This means they contain the same active ingredient (Sildenafil). They’re available in strengths of 25mg, 50mg and 100mg, and in quantities of 4, 8, 16, 32 or 64 tablets.  

Sildenafil key features

Sildenafil is often known as an ‘on-demand’ treatment because it only needs to be taken around 1 hour before sex, rather than daily.

  • Oral tablet
  • Works in as little as 30 minutes
  • Lasts up to 4 hours

Read more about taking Sildenafil in the Directions for Use section and remember to always read the Patient Information Leaflet that comes with the medication. 

How does Sildenafil work for ED?

Sildenafil treats ED by inhibiting the enzyme PDE5, which naturally breaks down cGMP (a chemical that relaxes blood vessels) in the penis.  

Let’s break it down

When sexual stimulation occurs, nitric oxide is released in the erectile tissue, triggering cGMP production which relaxes smooth muscles and increases blood flow to the penis.  

By blocking PDE5, Sildenafil allows cGMP to accumulate and persist longer, maintaining the relaxation of blood vessels and ensuring sufficient blood remains in the penis to sustain an erection.  

Good to know

Sildenafil only works when you’re sexually aroused and doesn't automatically produce an erection without stimulation. Once taken, it typically begins working within 30 minutes and its effects can last for approximately 4 hours, though it doesn't cause continuous erections during this period.

Am I eligible for Sildenafil film-coated tablets?

Sildenafil film-coated tablets are a prescription-only medication. You might be suitable if you meet the criteria below, however a doctor will complete a full clinical review of your completed online assessment before issuing a prescription.

  • Male (those assigned male at birth)
  • Aged 18 or over

There are several factors where Sildenafil may not be an appropriate treatment, including if:

  • You take nitrates for a heart condition. These are usually tablets or capsules called Isosorbide Mononitrate or Nicorandil (a medicine very similar to a nitrate) but can be called by other names
  • You use poppers
  • You have angina or have ever been given a spray that goes under your tongue to help chest pain
  • You have had a heart attack or stroke within the last six weeks
  • You have a condition called Peyronie’s or your penis has a bend when erect
  • You, or anyone in your family, has a history of eye disease, including retinitis pigmentosa or non-arteritic anterior ischaemic optic neuropathy (NAION)
  • You have liver or kidney problems
  • You have sickle-cell disease, multiple myeloma, or leukaemia
  • You have a stomach ulcer  
  • You have low blood pressure
  • You have uncontrolled high blood pressure

Our expert team are on-hand to have a confidential and judgement-free chat about any concerns or finding the right treatment path. Call us on 01295 262925 or email [email protected]. 


Sildenafil Tablets (25mg, 50mg,100mg) reviews

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How to use Sildenafil Tablets (25mg, 50mg,100mg)

Sildenafil film-coated tablets come in strengths of 25mg, 50mg and 100mg. They’re prescription-only and should always be taken as directed.

Make sure to thoroughly read the Patient Information Leaflet that comes with your medication.

How to take Sildenafil

The usual recommended dose of Sildenafil is 50 mg taken as needed approximately one hour before sexual activity. Based on efficacy and tolerance, the dose may be increased to 75 mg or 100 mg, or decreased to 25 mg. The maximum recommended dose is 100 mg.  

The tablet should be swallowed whole with a glass of water.

Doses above 100mg do not increase Sildenafil’s performance, but it can lead to an increase and severity of side effects.

How long does Sildenafil take to work?

You should take your dose of Sildenafil up to an hour before intercourse and it should start to work in around 30 minutes. It requires sexual stimulation to work.

The effects of Sildenafil can last for approximately 4 hours, though it doesn't cause continuous erections during this period.


Side effects of Sildenafil Tablets (25mg, 50mg,100mg)

Below we’ve listed some of the ‘Common’ side effects of Sildenafil tablets. You should always read the Patient Information Leaflet that comes with your medication. A copy of this will also be in the medication packaging or box.

Common side effects (may affect up to 1 in 10 people)

  • Headaches
  • Flushing (red and/or warm skin on the upper body, often on the face)
  • Stuffy nose
  • Upset stomach
  • Nausea
  • Dizziness

The side effects listed below are more serious, and you should stop taking Sildenafil, and get medical help immediately.

  • An erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, seek medical help immediately. Priapism can permanently damage your penis.
  • Sudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking Sildenafil and get medical help right away if you have sudden vision loss in one or both eyes.
  • Sudden hearing decrease or hearing loss. Some people may also have ringing in their ears (tinnitus) or dizziness. If you experience these symptoms, stop taking Sildenafil and contact a doctor right away.

If you would like to talk to our Healthcare Advisors about any concerns around side-effects please call us on 01295 262925 or email [email protected]. 

Frequently Asked Questions

What is Sildenafil prescribed for?

If you suffer from issues with male sexual function (impotence or erectile dysfunction) you may be able to use Sildenafil. In conjunction with sexual stimulation, Sildenafil helps a man get and maintain an erection by boosting blood flow to the penis. This medication does not offer protection from STDs (such as HIV, hepatitis B, gonorrhoea, and syphilis). Practise safe sex, like using condoms. For more information, speak with your doctor or pharmacist.

Is there more than one type of Sildenafil? Which should I choose?

As part of your consultation, we will ask you to select your preferred treatment if you have one.

Generic Sildenafil suits most people who use it. The brand or packaging can sometimes change depending on which stock we get from our wholesaler.

Some people prefer to have the same brand with every order. In this case, you can order Sandoz Sildenafil or Teva Sildenafil and get the same product every time.

Sandoz Sildenafil is a popular choice because neat score lines across the tablets make them easy to break into halves or quarters.

Sildenafil is also available under the brand name Viagra, which is more costly.

Does Sildenafil work?

It does. Several clinical investigations showed that Sildenafil works well for treating ED. People who used the medication in these studies were better able to achieve and maintain erections that allowed successful intercourse.

How long does Sildenafil take to work and how long does it last?

Sildenafil is an effective drug for Erectile Dysfunction (ED) and starts to work as quickly as 14 minutes in some men.

Sildenafil lasts for up to 4 hours after taking it. However, in some men, the effects could last up to 10 hours. Within 24 hours, the medication is at very low or undetectable levels in the body.

Can I take 200mg of Sildenafil?

No more than 100mg of Sildenafil should be taken daily. Taking more than 100mg doesn’t increase Sildenafil’s effectiveness, but it can lead to an increase and severity of side effects.

What are the alternatives to Sildenafil?

There are several tablet alternatives to Sildenafil. They all produce the same result of helping to get or maintain an erection firm enough to enjoy sexual intercourse, but there are differences in when to take and how long they last for.

Tadalafil (Cialis)

Another oral pill, Cialis begins to function around 30 minutes after you take it and lasts for up to 36 hours. For “as needed” use, 10mg is the recommended starting dose. You can only take it once per day, just when necessary. Cialis may be taken with or without food.

There is also a once-daily variation. These 2.5mg or 5mg pills are taken every day at the same time, regardless of whether you have sex that day.

Vardenafil (Levitra)

Levitra takes up to an hour to start working. 10mg is often the initial dose. Again, this tablet can only be taken once per day, with or without food.

Avanafil (Spedra)

There are 50, 100, and 200mg tablets of Spedra available. You take it as needed, around 15 to 30 minutes before engaging in sexual activity. They may be taken with or without meals.

How to reduce side effects of Sildenafil

You should speak to your doctor if you are experiencing concerning side effects when taking Sildenafil. If you are on a higher dose of Sildenafil, for example, 100mg or 50mg, we may decrease your dose to try and stop the side effects or try an alternative treatment. Speak to us for expert, confidential advice.

Can women take Sildenafil?

Sildenafil is an ED treatment designed for biological males over 18 to get or maintain an erection firm enough to enjoy sexual intercourse. Sildenafil is not approved by the Medicines and Healthcare products Regulatory Agency (MHRA) for use by women.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Sildenafil Tablets (25mg, 50mg,100mg) - Patient Information Leaflet

leaflet icon
References
  1. NHS - Erectile Dysfunction
  2. NHS - Sildenafil
  3. NHS - Getting medicines safely online
  4. GPhC - Buying medicines safely online

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Authored on 08 May 2025

Robert Bradshaw

Robert Bradshaw - MRPharms BSc(Hons) Pharmacy

Superintendent Pharmacist

GPhC Number: 2036118

Reviewed on 08 May 2025

Kiran Jones

Kiran Jones - MPharm, MRPharmS

Pharmacist / Medical Content Writer

GPhC Number: 2071585

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