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Sildenafil Tablets 25mg/50mg/100mg
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£3.49
Effective Within 30-60 Minutes 
Lasts for up to 4 hours
Effective in >80% of users*
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4.7*+ User Rating Sildenafil Tablets 25mg/50mg/100mg
Buy Sildenafil Online
You can buy Sildenafil tablets online from our UK registered pharmacy.
All consultations are reviewed by a pharmacist beforehand.
Orders are dispatched in plain and discreet packaging, using a next-day delivery service.
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 | £5.89 | £9.45 | £13.45 | £16.99 | £20.99 | £24.75 | £28.49 | £31.99 | £48.99 |
| Sildenafil 50mg Tablets | £7.49 | £13.89 | £19.99 | £24.99 | £30.99 | £36.49 | £41.99 | £46.99 | £64.89 | |
| Sildenafil 100mg Tablets | £8.20 | £14.89 | £21.49 | £25.99 | £32.20 | £38.40 | £44.49 | £48.99 | £78.99 |
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 |
About Sildenafil
What is Sildenafil?
Sildenafil is a prescription medication used to treat ED. It contains the active ingredient Sildenafil citrate.
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
Sildenafil Dosage
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. |
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 — and are equally effective, but Tadalafil’s longer duration means it’s often called the “weekend pill.”
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.
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 daily.
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.
Product Reviews
product rated 4.8/5
Very effective on the first time of use
By Peter Targett (via Reviews.io)
The product I have been using for a good while is very good does the job required at a reasonable price.
By Jonathan Hartley (via Reviews.io)
Works as described
By Mr Singh (via Reviews.io)
Very pleased with product
By Haydn (via Reviews.io)
Superintendent Pharmacist
Written by Chemist Click
First created 25th April 2025
Last reviewed 28th October 2025
Sources
- NHS. Sildenafil (Viagra): medicine for erection problems. Retrieved 28 October, 2025
- British National Formulary. (n.d.). Sildenafil. Retrieved October 28, 2025
- GUAY, A.T. et al. (2001) ‘Efficacy and safety of sildenafil citrate for treatment of erectile dysfunction in a population with associated organic risk factors’, Journal of Andrology, 22(5), pp. 793–797. doi:10.1002/j.1939-4640.2001.tb02582.x.
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