Sildenafil UK
  • Sildenafil UK


Medication features

  • Works within 30-60 minutes
  • Generic version of Viagra
  • Cheapest erectile dysfunction treatment
  • No more than ONE tablet in 24 hours
If you require a particular manufacturer of Sildenafil, please contact us after placing your order.


Order Sildenafil Online

You can request to buy Sildenafil online in the UK without a prescription, from our registered online pharmacy and doctor service. Sildenafil tablets are a treatment for erectile dysfunction in men.

As this medication requires a prescription, you will need to complete an online assessment. Once you have completed your order, our UK registered and trained GP's will review your assessment. If approved, a prescription will be issued which is passed on to our UK registered online pharmacy. The pharmacy team will dispense your order, and dispatch the medication to your chosen delivery address.

What Are Sildenafil Tablets?

Sildenafil is a drug used for erectile dysfunction in men. It is the generic form of the well-known drug, Viagra. The patent for Viagra expired in 2013, which allowed manufacturers other than Pfizer to make the medication. This, in turn, drove down the price of the active ingredient, Sildenafil. Sildenafil is a popular choice of treatment for erectile dysfunction, as medically there is no difference between Sildenafil and its branded alternative, yet Sildenafil is a much more affordable option.

Sildenafil Reviews

How it works

Sildenafil is from a class of drug called PDE inhibitors. Men who suffer from ED are unable to pump enough blood into the penis to achieve a hard enough erection. Sildenafil helps men achieve a harder and longer-lasting erection, by stimulating blood flow to the penis, resulting in longer and harder erections for men who struggle. 

Strengths of Sildenafil Tablet

Sildenafil 25mgTypically used for men who have found that 50mg is too strong, and resulted in an erection which was harder or more longer-lasting than required.From 78p / Tablet
Sildenafil 50mgSildenafil 50mg tablets is usually the recommended starting dosage. Most men will find this delivers the desired response, and an erection sufficient for intercourse will be achieved.From £1.01 / Tablet
Sildenafil 100mgThe 100mg dosage is reserved for men who have not responded to the 50mg strength. You shouldn't start treatment at 100mg, as this can potentially lead to an erection that lasts too long or becomes painful.From £1.43 / Tablet

Further Reading: Sildenafil 50mg vs 100mg

Sildenafil 50mg vs 100mg

How to take Sildenafil

The typical starting dose for Sildenafil is ONE 50mg tablet 30 minutes before sexual activity. Most men will find this dose effective, however, if 50mg is too strong, you may wish to half the tablet the next time you are taking the medication. If successful, a 25mg tablet may be more suitable for your next prescription. 

If the 50mg does not achieve the desired result, you should try the same dose 2-3 more times, to see if you can achieve a satisfactory erection. If this is not successful, you can increase your dosage to 100mg. If a 100mg dose is also ineffective, speak to us about the next steps. Sildenafil should not be taken more than once in 24 hours.

If you have already used a few erectile pills without success, a face to face referral may be required. 

If you have not yet tried one of the other ED medications, you may find that Tadalafil or Vardenafil is effective for you.

Patients will find different drugs more effective. This does not necessarily mean one drug is more effective than another. It can be that your body responds slightly differently to a particular medication.

Sildenafil Summary

Sildenafil Dose

Take one Sildenafil tablet about one hour before sex. For optimum performance, take on an empty stomach. The effects of Sildenafil can last between 4-6 hours.

How does Sildenafil work

Increases blood flow to the penis when sexually aroused.

Sildenafil Effectiveness

Most men will notice a firmer and longer-lasting erection. Doctors often advise trying all erectile dysfunction medicines eight times before trying alternatives.

Side effects

Can include nasal congestion, headaches, facial flushing, slight vertigo, a pounding heartbeat and blurred vision.


Starting from £3.75. Branded Viagra costs are significantly higher.


Available strengths are 25mg, 50mg and 100mg. 50mg is the typical starting dose.

Sildenafil Alternatives

Although Sildenafil provides the most affordable treatment, it may not always be best suited to your needs. Levitra (or Vardenafil) is the most suitable treatment for people who suffer from diabetes, while Cialis (or Tadalafil), provides a longer-lasting effect. There is also now an over the counter option of Sildenafil in the form of Viagra Connect. This contains Sildenafil 50mg. 

Vitaros cream is another alternative to oral medications in treating erectile dysfunction. If you have difficulty swallowing tablets, Nipatra (chewable sildenafil), is available.

You can also look at counselling since some men suffer from erectile dysfunction as a result of nerves. If you think your ED is psychological, therapy may provide long term benefits if successful. 

Comparisons of Sildenafil with other main ED medications are below.

Sildenafil vs Viagra

Sildenafil and Viagra are actually the same drugs. Each contains the active ingredient Sildenafil Citrate. The primary points of difference lie in cost and appearance. Sildenafil is significantly cheaper than its 'big brother' Viagra. Viagra is a branded version, manufactured by Pfizer. Its appearance is a trademarked diamond blue pill shape. Sildenafil is made by multiple different manufacturers, and its appearance can vary in colour and shape.

Each treatment has the same pharmaceutical properties. This means dosage, length of action and effectiveness are all the same.

Sildenafil vs Tadalafil

Sildenafil and Tadalafil are both erection pills, from the same family of drug, however, they have some differences. While Sildenafil is generally more cost-effective, Tadalafil can be longer-lasting. This can mean taking one tablet of Tadalafil on a Friday night, which could last you until Sunday night. What's best for you, may depend on how often you have sex. If you have sex several times per week, you may find a daily 5mg Tadalafil is most appropriate.

However, if you only have sex once a week, when required Sildenafil treatment might be best suited to your needs.

Duration of Action4-6 hoursUp to 72 hours
Daily Tablet Available?NoYes
PriceFrom 78p / TabFrom 67p / Tab
Speed of Action~30-60 mins~30 mins

Different Manufacturers

As Sildenafil is a generic medication, there are multiple manufacturers of the same drug. This means you may see differences in packaging and even the colour of the tablet from prescription to prescription. All manufacturers must meet MHRA standards, and so you can be confident the medication you receive contains exactly the same amount of active ingredients as any other.

In rare instances, some patients may notice one manufacturer is more suitable for them. This can be due to other ingredients in the medication such as colouring, which they may be allergic to. If you have noticed a particular manufacturer is better for you, please e-mail us after placing your order requesting which manufacturer you would like. We will then do our best to accommodate your request, or offer a refund if this is not possible.

Manufacturers of Sildenafil tablets in the UK include Teva, Mylan, Accord, Actavis, Dr Reddys, Sandoz and Zentiva amongst others. 

Teva Sildenafil

Many men request Sildenafil by Teva from our pharmacy. It's difficult to obtain scientific data to demonstrate that Teva Sildenafil is any more effective than any other manufacturer. Often, trends towards a particular manufacturer of a drug can be driven by online discussion forums and boards. All medication sourced by our pharmacy is from MHRA regulated wholesalers and manufacturers. There should be no medical difference between manufacturers in terms of effectiveness. 

Accord Sildenafil

Accord Sildenafil is another well-searched manufacturer of Sildenafil. We can accommodate requests for this particular version of Sildenafil. Just drop us a message after you place an order requesting Accord Sildenafil, and our pharmacy team will aim to provide this manufacturer. If for any reason we are unable to source a particular manufacturer, we will give you the option of a refund, or to proceed with another manufacturer. 

Side Effects of Sildenafil

With any medication you take, there is always a risk of side effects occurring. Some are more common than others, and often side effects may subside with the regular usage of the medicine. If the side effects do not subside, you should report them to us, or your GP.

Common Side Effects

  • Headaches
  • Flushing
  • Runny/stuffed nose
  • Upset stomach
  • Nausea
  • Red and/or warm skin
  • Dizziness
  • Diarrhoea
  • Nosebleeds
  • Muscle pain / Back Pain

The side effects listed below are more serious, and you should stop taking Sildenafil, and report these to your GP 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 call your healthcare provider 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.

For a full list of side effects, please read the patient information leaflet.

Sildenafil Dosage

For those who have never taken Sildenafil before, the typical dose is 50mg. This is taken 30-60 minutes before sexual activity. 

If no effect is seen, the dosage can be adjusted up to a maximum of 100mg as a single dose in 24hours. If the effect was too strong, the dose can be reduced to 25mg. If you have not seen a response from Sildenafil, it is advised to try it at least 5 times before giving up.

Sildenafil 50mg vs 100mg


Alpha-blockers and Sildenafil

If you are taking alpha-blocking medicines, such as tamsulosin or trazodone, you are advised to leave at least six hours between taking your alpha-blocker and Sildenafil.

Nitrates and Sildenafil

Sildenafil cannot be prescribed by our doctor if you are taking nicorandil or nitrate-based medication, such as GTN spray or isosorbide mononitrate tablets for angina.

How to order Sildenafil Tablets

To place an order for Sildenafil, you need to complete the three steps detailed below. 

  1. Complete an Assessment
  2. Select your medication
  3. Checkout

Whichever ED treatment you are prescribed, it is important you read the patient information leaflet carefully and take note of the side effects which may occur. You can also read more about Sildenafil, Sildenafil and other ED treatments and condition information at the NHS choices website.

Sildenafil Prices

Sildenafil - 2 tablets


Sildenafil - 4 tablets


Sildenafil - 8 tablets


Sildenafil - 16 tablets


Sildenafil - 32 tablets


Sildenafil - 64 tablets


Cheapest Sildenafil


Hywel McGlinchy, Clinical Pharmacist


Hywel McGlinchy

RoleClinical Pharmacist
Qual.Masters of Pharmacy
AboutHywel started with Simple Online Pharmacy in 2020. He's responsible for helping author and review accurate site content. He also works with our GPs to make sure all aspects of patient safety are covered. 


Can you take Sildenafil for erectile dysfunction?

Yes. Sildenafil is the active ingredient in Viagra and is one of the most widely used drugs for erectile dysfunction.

What is Sildenafil?

Sildenafil is a drug used in the treatment of Erectile Dysfunction. It is the active ingredient in Viagra and is of the class of drugs known as PDE5 inhibitors.

How Does Sildenafil Work?

Sildenafil is a class of drug (like Cialis / Tadalafil) known as a PDE-5 inhibitor. When sexually stimulated, it helps maintain a relaxed muscle state and increases blood flow to the penis which helps facilitate an erection

How much is Sildenafil?

Sildenafil tablets can vary in price from genuine UK online pharmacies, from between £0.98 / Tablet, to £10.40 / tablet, depending on strength and quantity

What is the dosage of Sildenafil?

Usually, when starting to take Sildenafil, your doctor will recommend starting on a 50mg dose. This means you will take a 50mg tablet, around 30-60 minutes before sexual activity. The maximum dose is 100mg in a 24 hour period.

How long does it take Sildenafil to take effect?

Sildenafil takes around 30-60 minutes to take effect, and so should generally be taken around half an hour before sexual activity.

What is the difference between Sildenafil and Viagra

Sildenafil is the generic form of the better known branded drug Viagra. This means that both medications contain exactly the same active ingredient.

Is Viagra stronger than Sildenafil?

Medically, both Viagra and Sildenafil contain exactly the same amount of active ingredient, so you should not notice any difference in effect between the two medications

Can I take Sildenafil at the same time as other Erectile Dysfunction Medication?

No. Sildenafil and other ED medications all work in the same way. This means that taking them together can result in overdose and an increased incidence of side effects.

What strengths is Sildenafil available in?

Sildenafil is available as Sildenafil 25mg, 50mg or 100mg Tablets.

What dose of Sildenafil should I start with?

If taking Sildenafil for the first time, the recommended dose is 50mg, 30-60minutes before sexual activity. The dose can then be increased or decreased according to the response.

How long does Sildenafil last?

The effects of Sildenafil may be noticeable for up to 4 hours after taking your dose.

What is Sildenafil TEVA?

TEVA Sildenafil is simply a specific manufacturer of Sildenafil. Please contact us if you require a specific manufacturer of Sildenafil.

What is in Sildenafil?

The full name of the active ingredient is Sildenafil Citrate

What strengths does Sildenafil come in?

Sildenafil comes in three different strengths. Sildenafil 100mg is the strongest, and there are also 25mg and Sildenafil 50mg strengths available. Detailed information can be found in comparing sildenafil strengths.

Can women take Sildenafil?

No. Sildenafil and Viagra are licensed treatments for men. Women cannot take this treatment.

Can I buy Sildenafil online?

Yes. You can buy Sildenafil online in the UK, from our UK registered online pharmacy and doctor service.

Is it legal to buy Sildenafil online?

Yes. You can safely buy Sildenafil in the UK after completing our online doctor assessment. A legal prescription is issued to our pharmacy if your order is approved. We are regulated by the MHRA and GPHC.

How long can the average man maintain an erection?

This amount of time an erection can be maintained can vary on factors such as sildenafil use and time until ejaculation. For a majority of men, erections will last anywhere from 3 to 30 minutes. For an in-depth look at this topic, you can read 'How long can the average man stay erect?'.

What is better, Sildenafil or Tadalafil?

The main difference between Sildenafil and Tadalafil is that Tadalafil is longer acting, so you may notice the effects for longer.

What is cheaper, Sildenafil or Tadalafil?

Sildenafil is slightly cheaper than Tadalafil currently, but prices are coming down for Tadalafil, as it was only recently made available in the UK

Is chewable Sildenafil available?

Chewable Sildenafil, also known as Bluechew in the USA, is available as Nipatra in the UK.

Why is your Sildenafil so cheap?

We try to keep our prices as low as possible and constantly check prices to pass savings to you.


Treatment Comparison

Active IngredientSildenafilSildenafilTadalafilTadalafilVardenafilVardenafilAvanafil
Time to Take Effect30-60 mins30-60 mins15-45 mins15-45 mins30-60 mins30-60 mins15-30 mins
Duration of Action4-6 hours4-6 hours24-36 hours24-36 hours4-6 hours4-6 hours4-6 hours
Unique FeatureSame active ingredient as ViagraMost well knownSame active ingredient as CialisLongest ActingUsed for diabeticsUsed for diabeticsQuickest Acting
Price Per TabletFrom 78pFrom £4.84From 67pFrom £2.26From £2.74From £2.97From £2.97


Info Leaflet

Before taking Sildenafil or any medication, it is important to read the Patient Information Leaflet.

Order within for guaranteed next day delivery options


Prices From £3.75
As low as £0.78 / tablet

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Medication Simple Online Pharmacy MedExpress
Assured Pharmacy
10mg Dispersible x32 £199.95
10mg Dispersible x24 £159.95
10mg Dispersible x16 £114.50
10mg Dispersible x8 £59.95
10mg Dispersible x4 £40.95
20mg x32 £219.95
20mg x24 £169.99
20mg x16 £115.50
£169.99 £169.99
20mg x8 £60.95
£89.99 £99.99
20mg x4 £31.95
£46.99 £55.00
10mg x32 £169.95
10mg x24 £124.50
10mg x16 £89.99
£132.99 £119.99
10mg x8 £49.99
£69.99 £60.00
10mg x4 £29.65
£42.99 £43.99
5mg x32 £94.95
5mg x24 £83.95
5mg x16 £67.95
5mg x8 £45.65
£62.99 £59.99
5mg x4 £23.45
£36.99 £37.00
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 £42.39


Medication Simple Online Pharmacy MedExpress
Assured Pharmacy
200mg x32 £184.95
£269.99 N/A
200mg x16 £99.50
£134.99 N/A
200mg x12 £76.95
200mg x8 £57.95
£69.99 N/A
200mg x4 £29.95
£36.99 N/A
100mg x32 £134.95
£199.99 N/A
100mg x16 £74.50
£99.99 N/A
100mg x12 £57.95
100mg x8 £39.50
£54.99 N/A
100mg x4 £20.95
£28.99 N/A
50mg x32 £94.95
£169.99 N/A
50mg x16 £49.99
£89.99 N/A
50mg x12 £39.95
50mg x8 £29.95
£49.99 N/A
50mg x4 £19.99
£24.99 N/A
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 £42.39


Medication Simple Online Pharmacy MedExpress
Assured Pharmacy
100mg x64 £91.99
£139.99 £127.99
100mg x48 £69.99
100mg x32 £49.95
£89.99 £71.99
100mg x24 £39.99
£69.99 N/A
100mg x16 £25.99
£49.99 £47.99
100mg x12 £22.99
100mg x8 £15.24
£29.99 £29.99
100mg x4 £8.19
£19.99 £16.00
50mg x64 £64.94
£139.99 £127.99
50mg x48 £58.99
50mg x32 £47.99
£89.99 £71.99
50mg x24 £38.99
£69.99 N/A
50mg x16 £24.99
£49.99 £47.99
50mg x12 £19.99
50mg x8 £13.89
£29.99 £29.99
50mg x4 £7.49
£19.99 £16.00
25mg x64 £49.89
£89.99 £96.00
25mg x48 £40.95
25mg x32 £32.49
£79.99 £71.99
25mg x24 £24.95
£69.99 N/A
25mg x16 £17.19
£49.99 £47.99
25mg x12 £14.95
25mg x8 £9.49
£29.99 £29.99
25mg x4 £5.89
£15.99 £16.00
25mg x2 £3.75
50mg x2 £4.25
100mg x2 £4.75
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 £42.39

Viagra UK

Medication Simple Online Pharmacy MedExpress
Assured Pharmacy
100mg x64 £449.95
£499.99 £539.99
100mg x32 £235.95
£249.99 £289.99
100mg x16 £121.50
£139.99 £149.99
100mg x12 £95.95
100mg x8 £63.95
£69.99 £79.99
100mg x4 £33.50
£34.99 £47.00
50mg x64 £399.95
£479.99 £519.99
50mg x32 £209.95
£235.99 £285.99
50mg x16 £112.00
£139.99 £149.99
50mg x12 £89.99
50mg x8 £58.95
£69.99 £76.99
50mg x4 £29.95
£34.99 £46.00
25mg x64 £309.95
£439.99 £419.99
25mg x32 £159.95
£219.99 £219.99
25mg x16 £81.95
£119.99 £129.99
25mg x12 £61.95
25mg x8 £43.95
£59.99 £69.90
25mg x4 £24.95
£29.99 £45.00
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 £42.39


Medication Simple Online Pharmacy MedExpress
Assured Pharmacy
10mg (When Required Dose) x4 £8.95
£19.99 £19.98
10mg (When Required Dose) x8 £15.95
£29.99 £34.98
10mg (When Required Dose) x12 £22.95
£39.99 £49.99
10mg (When Required Dose) x16 £25.45
£49.99 £59.50
10mg (When Required Dose) x32 £43.95
£89.99 £89.50
10mg (When Required Dose) x64 £84.95
£139.99 £139.98
20mg (When Required Dose) x4 £9.75
£19.99 £19.98
20mg (When Required Dose) x8 £15.95
£29.99 £34.98
20mg (When Required Dose) x12 £23.80
N/A £49.99
20mg (When Required Dose) x16 £28.45
£49.99 £59.50
20mg (When Required Dose) x32 £53.95
£89.99 £89.50
20mg (When Required Dose) x64 £99.95
£139.99 £139.98
5mg (Daily Dose) x28 £22.85
5mg (Daily Dose) x56 £44.85
5mg (Daily Dose) x84 £66.95
2.5mg (Daily Dose) x28 £19.85
2.5mg (Daily Dose) x56 £38.50
2.5mg (Daily Dose) x84 £56.50
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 £42.39

Viagra Connect (Sildenafil) 50mg

Medication Simple Online Pharmacy MedExpress
50mg x4 £18.48
£17.99 £19.99 £19.99
50mg x8 £31.98
£33.99 £34.99 £34.99
50mg x12 £49.98
£50.99 £51.99 £50.99
50mg x16 £63.50
£67.99 N/A N/A
50mg x32 £109.95
£139.99 N/A N/A
50mg x2 £10.75


Medication Simple Online Pharmacy
20mg x32 £197.95
20mg x24 £150.95
20mg x16 £103.95
20mg x8 £52.95
20mg x4 £29.95
10mg x32 £133.95
10mg x24 £102.95
10mg x16 £80.95
10mg x8 £44.95
10mg x4 £25.95
5mg x32 £87.75
5mg x24 £77.75
5mg x16 £62.95
5mg x8 £36.65
5mg x4 £17.99
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 £42.39

Vitaros Cream

Medication Simple Online Pharmacy
3mg/g x4 Sachets £61.25
3mg/g x8 Sachets £108.99
3mg/g x12 Sachets £153.99


Medication Simple Online Pharmacy MedExpress
Assured Pharmacy
20mg (When Required Dose) x64 £449.95
20mg (When Required Dose) x32 £239.95
£299.99 £260.00
20mg (When Required Dose) x16 £137.95
£139.99 £150.00
20mg (When Required Dose) x12 £109.95
£119.99 £112.00
20mg (When Required Dose) x8 £71.95
£79.99 £84.00
20mg (When Required Dose) x4 £38.95
£39.99 £45.00
10mg (When Required Dose) x64 £444.95
10mg (When Required Dose) x32 £234.95
£299.99 £260.00
10mg (When Required Dose) x16 £132.00
£159.99 £150.00
10mg (When Required Dose) x12 £104.95
£119.99 £112.00
10mg (When Required Dose) x8 £68.65
£79.99 £84.00
10mg (When Required Dose) x4 £37.95
£39.99 £45.00
5mg (Daily Tablet) x84 £189.95
£199.99 £198.00
5mg (Daily Tablet) x56 £142.50
£139.99 £149.99
5mg (Daily Tablet) x28 £71.95
£69.99 £90.00
2.5mg (Daily Tablet) x84 £189.95
£199.99 £198.00
2.5mg (Daily Tablet) x56 £137.95
£149.99 £139.99
2.5mg (Daily Tablet) x28 £68.95
£69.99 £90.00
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 £42.39


Medication Simple Online Pharmacy
Sildenafil is Licensed UK alternative x1 £0.00


Medication Simple Online Pharmacy
Sildenafil is Licensed UK alternative x1 £0.00

ED Trial Pack

Medication Simple Online Pharmacy
Sildenafil 50mg x 4, Tadalafil 10mg x 4, Vardenafil 10mg x 4 x12 £42.39

Nipatra (Chewable Sildenafil)

Medication Simple Online Pharmacy
25mg x4 £18.99
25mg x8 £28.99
25mg x12 £38.99
25mg x16 £48.99
25mg x32 £88.99
25mg x64 £138.99
50mg x4 £18.99
50mg x8 £28.99
50mg x12 £38.99
50mg x16 £48.99
50mg x32 £88.99
50mg x64 £138.99
100mg x4 £18.99
100mg x8 £28.99
100mg x12 £38.99
100mg x16 £48.99
100mg x32 £88.99
100mg x64 £138.99