Buy Sildenafil Online

You can buy Sildenafil tablets online from Chemist Click, a UK registered online pharmacy.

Sildenafil is a prescription treatment for erectile dysfunction and is available in 25mg, 50mg and 100mg strengths.

Complete a free online consultation and, if treatment is suitable, your order will be reviewed by a pharmacist and delivered discreetly.

It is important to note that Sildenafil may not be suitable for use in those with certain medical conditions, or those taking certain medication. Please ensure to provide a full list of medication and an accurate medical history when completing a consultation.

Sildenafil Prices

Name & Dosage x2 Tablets x4 Tablets x8 Tablets x12 Tablets x16 Tablets x20 Tablets x24 Tablets x28 Tablets x32 Tablets x64 Tablets
Sildenafil 25mg Tablets £3.49 £2.97 £5.89 £5.01 £9.45 £8.03 £13.45 £11.43 £16.99 £14.44 £20.99 £17.84 £24.75 £21.04 £28.49 £24.22 £31.99 £27.19 £48.99 £41.64
Sildenafil 50mg Tablets £7.49 £6.37 £13.89 £11.81 £19.99 £16.99 £24.99 £21.24 £30.99 £26.34 £36.49 £31.02 £41.99 £35.69 £46.99 £39.94 £64.89 £55.16
Sildenafil 100mg Tablets £8.20 £6.97 £14.89 £12.66 £21.49 £18.27 £25.99 £22.09 £32.20 £27.37 £38.40 £32.64 £44.49 £37.82 £48.99 £41.64 £78.99 £67.14

Making use of discount code SPRING26

Summary for Sildenafil Tablets

Medication Class Phosphodiesterase 5 (PDE5) inhibitor
Mechanism of action Widens blood vessels to improve blood flow to the penis
Active ingredient Sildenafil citrate
Strength 25mg, 50mg, 100mg
Effective within 30 - 60 minutes
Dosage Instructions 1 tablet around 60 minutes before sexual activity
Manufacturer Teva, Accord, Bristol, Mylan, Jubilant, Genesis, Sandoz, Milpharm, Torrent, Sandoz
Use with alcohol In moderation

What is Sildenafil used for?

Sildenafil is used to treat erectile dysfunction, which is when a man has difficulty getting or maintaining an erection firm enough for sex.

It helps improve blood flow to the penis, making it easier to get an erection when sexually aroused.

Sildenafil does not increase sexual desire and will only work with sexual stimulation.

How does Sildenafil work?

Sildenafil works by increasing blood flow to the penis to help achieve and maintain an erection.

PDE5 (phosphodiesterase type 5) is an enzyme which prevents blood from entering the penis.

Sildenafil blocks PDE5, allowing blood to enter the penis and cause an erection.

Note: Sildenafil will only work where there is sexual stimulation.

How long does Sildenafil last?

Sildenafil usually lasts for up to 4 hours.

Note: Sildenafil helps you get an erection when sexually aroused — it does not cause a continuous erection or increase sexual desire.

How long does Sildenafil take to work?

Sildenafil usually takes 30 to 60 minutes to work.

Some men may notice results in as little as 20 minutes, especially if the tablet is taken on an empty stomach.

Avoid heavy or fatty meals beforehand, as these can slow down absorption and delay its effects.

Sildenafil Dosage Instructions

Take one tablet around 60 minutes before sexual activity.

The recommended starting dose of Sildenafil is 50mg.

Comparing Sildenafil dosages

Dosage Who It’s Best For
Sildenafil
25mg
Those taking medication that can lower blood pressure.
Those who have experienced side effects from the higher doses.
Sildenafil
50mg
Typical starting dose for most men.
Sildenafil
100mg
Men who need a stronger effect and have responded well to the 50mg dose.

How to take Sildenafil for best results

Take one Sildenafil tablet around 30 to 60 minutes before sex.

For best results, take it with water and avoid heavy or fatty meals beforehand, as food can delay how quickly it works. Sildenafil works best when you are sexually aroused and should not be taken more than once in 24 hours.

Important note: The maximum dose of sildenafil is 100mg daily. You should never take more than 100mg of sildenafil within 24 hours. Taking too much sildenafil can cause dangerous side effects such as low blood pressure and priapism. You should seek medical attention if this happens. Always consult your doctor or pharmacist to discuss the most appropriate sildenafil dosage.

Sildenafil Side Effects

Like all medicines, Sildenafil can cause side effects, although not everyone gets them.

Most side effects are mild and short-lived, and many men tolerate the medicine well.

Common side effects (up to 1 in 10 men):

  • Headache
  • Flushing (warmth or redness in the face)
  • Indigestion or heartburn
  • Blocked or runny nose
  • Dizziness

Uncommon side effects (up to 1 in 100 men):

  • Nausea
  • Muscle pain or back pain
  • Blurred vision or sensitivity to light
  • Fatigue

Sildenafil Warnings

Speak to your doctor or pharmacist before taking Sildenafil if:

  • You have an allergy to any of the ingredients in the tablet
  • You have recently experienced issues with your heart such as a heart attack or stroke
  • You have low blood pressure
  • You have angina
  • You have sickle-cell anaemia, an abnormality of your red blood cells.
  • You have liver or kidney problems
  • You have problems with your eyes (not including poor vision such which requires correcting with glasses)
  • You have leukaemia, cancer of the blood
  • You have bone marrow cancer
  • You have an anatomical deformation of the penis
  • You have bleeding disorders
  • You currently have or have had a history of stomach ulcers

Sildenafil Interactions

Sildenafil interactions that you should be aware of include:

  • Nitrates – Used to treat angina. Examples include isosorbide mononitrate, isosorbide dinitrate, glyceryl trinitrate
  • Guanylate cyclase stimulators – Used to treat conditions such as heart failure and high blood pressure in the lungs. Examples include riociguat
  • Blood pressure medication – Used to treat hypertension. Examples include alpha-blockers (such as doxazosin, alfuzosin), calcium channel blockers (such as amlodipine), beta blockers (such as atenolol, bisoprolol), ACE inhibitors (such as ramipril, lisinopril)
  • Medication to treat an enlarged prostate – Examples include tamsulosin and alfuzosin
  • Some antifungals – Used to treat fungal infections. Examples include ketoconazole, itraconazole
  • Medication used to treat HIV

Sildenafil interacts with over 250 different drugs. Always let your doctor or pharmacist know of any medication you are taking, or planning to take, including recreational drugs.

It may still be possible to take Sildenafil, but your dose may need adjusting.

Frequently Asked Questions

Both Sildenafil and Tadalafil are medicines used to treat erectile dysfunction (ED), but they differ in how long they last and how they’re taken.

  • Sildenafil works for up to 4 hours and is taken as needed, about 30–60 minutes before sex.
  • Tadalafil lasts up to 36 hours, allowing more flexibility and spontaneity. It can be taken as needed or as a lower daily dose for ongoing effects.

Both work in the same way, by increasing blood flow to the penis. They are equally effective, but Tadalafil’s longer duration means it’s often called the “weekend pill.”

Feature Sildenafil Tadalafil
Time to work Usually 30–60 minutes Usually 30–60 minutes
Duration Up to 4 hours Up to 36 hours
Best for Planned use More flexibility
Daily option Not usually used as daily ED treatment Available as daily low-dose treatment
Food effect Heavy meals may delay effect Less affected by food

 

Further reading: Sildenafil vs Tadalafil

Both contain the same active ingredient, Sildenafil citrate.

This means that they both work in the same way, and deliver the same results for treating erectile dysfunction.

The main difference is price – generic Sildenafil is cheaper.

Feature Sildenafil Viagra
Active ingredient Sildenafil citrate Sildenafil citrate
Brand/generic Generic medicine Branded medicine
Effectiveness Same active ingredient Same active ingredient
Time to work Usually 30–60 minutes Usually 30–60 minutes
Duration Up to 4 hours Up to 4 hours
Price Usually cheaper Usually more expensive

Sildenafil is effective for 82% of men

Yes – Sildenafil is safe for most men when taken as prescribed. It has been widely used for over 20 years to treat erectile dysfunction and has a well-established safety profile.

However, Sildenafil isn’t suitable for everyone. You should avoid taking it if you:

  • Use nitrate medicines (for chest pain or angina)
  • Take alpha-blockers without medical guidance
  • Have serious heart or liver problems
  • Have low blood pressure or have recently had a stroke or heart attack

Yes, Sildenafil can be taken once per day if needed.

Do not take Sildenafil more than once within a 24-hour period.

If you need erectile dysfunction treatment every day, speak to a pharmacist or doctor, as daily tadalafil may be more suitable.

Yes, you can drink alcohol with Sildenafil, but it’s best to do so in moderation. Drinking too much alcohol can reduce the effectiveness of Sildenafil and make it harder to get or maintain an erection.

Excessive alcohol can also increase side effects such as dizziness, headache, flushing, or low blood pressure.

Yes, you should use a pill cutter to avoid tablet wastage and to ensure you are receiving an accurate dose.

Many manufacturers produce generic Sildenafil, which works exactly the same as Viagra. All contain the same active ingredient – Sildenafil citrate – and are equally effective.

At Chemist Click, we source our stock from reputable UK wholesalers. While inactive ingredients like colouring or binding agents may vary slightly between brands, this does not affect how the medicine works.

Common brands we supply include Teva and Accord, but we can also provide Pfizer, Mylan, Bristol, Dr Reddy, Sandoz, Actavis, and Torrent on request. If you prefer a specific brand, please mention it on your consultation form.

Sildenafil is a prescription-only medicine in the UK.

You can buy Sildenafil online after completing a consultation, which is reviewed by a qualified healthcare professional. If suitable, treatment can be prescribed and supplied by a registered pharmacy.

The usual starting dose is 50mg.

Some men may be prescribed 25mg if they are more likely to experience side effects, while 100mg may be used if 50mg is not effective enough. You should only take the dose recommended after your consultation.

Yes. Generic Sildenafil and Viagra contain the same active ingredient, Sildenafil citrate. They work in the same way, but generic sildenafil is usually cheaper.

Sildenafil usually lasts for up to 4 hours. This does not mean you will have an erection for 4 hours; it means Sildenafil can help you get an erection during that window when sexually aroused.

Sildenafil may not work if you are not sexually aroused, take it after a heavy meal, drink too much alcohol, use too low a dose, or have an underlying health issue affecting erections.

Some men may need to try sildenafil several times before judging whether it works.

Product Reviews

See over 4000 service reviews

product rated 4.8/5

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"David's Review"

25mg tablets. Extremely effective and reliable every time. Take effect after just 20 minutes or so and still having an effect many hours afterwards. Few side effects at all (flushing and slight headache sometimes)

By David Walker (via Reviews.io)
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"Mathew's Review"

Works wonders. Will carry on using.

By Mathew Campbell (via Reviews.io)
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"Anonymous's Review"

Works well. After initial medical review easy to order, professional action

By Anonymous (via Reviews.io)
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"Mushtaq's Review"

Is good tablet

By Mushtaq Hussain (via Reviews.io)
Authored By
Abbas Kanani

Superintendent Pharmacist

Written by Chemist Click

First created 25th April 2025

Last reviewed 18th May 2026

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