Top Seller

Sildenafil Tablets (Generic Viagra)

Based on 51 reviews

Available in multiple pack sizes

  • Generic Viagra tablets for erectile dysfunction (ED) and impotence
  • One tablet a day, when required
  • From 78.1p per tablet
  • Helps you get and maintain an erection
  • Effective for 74% of men at treating ED
Strength & Quantity
Price

25mg - Pack of 4

£4.39

50mg - Pack of 4

£4.89

50mg - Pack of 24

£22.99

50mg - Pack of 64

£49.99

100mg - Pack of 4

£5.99

100mg - Pack of 24

£31.59

100mg - Pack of 64

£65.09
This treatment is inclusive of consultation & private prescription
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How we are regulated
Jacob Tilley - Medical Content Writer
Jacob Tilley
Medical Content Writer
21/11/2025
20/11/2027
Ian Budd - Prescribing Pharmacist
Ian Budd
Prescribing Pharmacist
2037876

Buy sildenafil tablets 

You can buy sildenafil as long as it's been approved and prescribed by one of our clinicians. 

Sildenafil tablets are used to treat erectile dysfunction in men, by helping you get and maintain an erection.

Sildenafil is not only the name of the ED treatment – it's the active ingredient in the medication. It’s also the active ingredient in both Viagra and Viagra Connect.   

 

How sildenafil tablets work

Sildenafil works by helping to relax the blood vessels in your penis, allowing blood to flow downstairs when you get sexually aroused. 

However, sildenafil tablets will only help you get an erection if you are sexually stimulated. You won’t get an erection simply by swallowing the pill.

How long does sildenafil take to work? 

It normally takes between 30 and 60 minutes for sildenafil to work. And while you can take it up to 4 hours before a romantic encounter, it’s actually recommended to take it one hour prior.  

But remember – sildenafil won’t get you hard on its own. It only works if you’re also sexually aroused.  

How long does sildenafil last? 

Sildenafil normally stays in your system for 4-6 hours. However, the more time that elapses after you’ve taken it, the less effective it becomes.  

 

How effective is sildenafil? 

Multiple studies report that when taking 50mg sildenafil, 74% of men found it helped them get and maintain an erection. 

The efficacy of sildenafil tends to rise and fall with the dosage. So 25mg may be less effective than the 50mg tablet, but 100mg may be more effective.  

 

How to take sildenafil 

  1. 1. Take one sildenafil tablet around one hour before you plan to have sex. 
  2. 2. Swallow the tablet whole, with some water. 
  3. 3. Do not take sildenafil more than once a day. 

Always make sure to read the patient information leaflet before taking a sildenafil tablet for the first time. 

And do not take sildenafil with grapefruit, as this can make any side effects worse. 

 

Sildenafil dosages explained 

Sildenafil tablets come in three doses: 25mg, 50mg and 100mg. The 50mg tablet is the recommended starting dose, and therefore the one you’re most likely to be prescribed.  

If you find the side effects too much, you can ask to go down to the 25mg dose. And if 50mg isn’t working, you could consider increasing your dose to 100mg. However, the 100mg tablet does come with a higher risk of side effects. 

 

How to order sildenafil 

You can order sildenafil tablets over the counter, but larger quantities or higher strengths may require going via the prescription route. 

You can start a consultation with Chemist4U, and our healthcare professionals can assess whether or not sildenafil is the right fit for you and your condition. 

If we do think it’s the right fit, you can then pay for your medication, and we’ll send it out to you quickly and in discreet packaging.  

If you want an over-the-counter erectile dysfunction treatment instead, then you could consider Viagra Connect or Cialis Together 

 

Sildenafil side effects 

Like all medicines, sildenafil may cause side effects in some people, but these won’t affect everybody. The most common side effects of sildenafil are: 

  • nausea 
  • hot flushes 
  • indigestion 
  • a colour tinge in your vision 
  • blurred vision 
  • visual disturbances 
  • a stuffy nose 
  • dizziness 

For a complete list of side effects, please refer to the patient information leaflet included with your medication, or read our guide on Viagra side effects 

If you experience any side effects not included in the patient information leaflet, you can report them using the MHRA Yellow Card Scheme. 

 

When not to take sildenafil tablets

Sildenafil may be unsuitable for certain people. You must be at least 18 years old to be prescribed sildenafil.  

And do not take sildenafil tablets if you are allergic to any of the ingredients listed in the patient information leaflet, or if it is incompatible with any medications you are already on. 

Avoid taking sildenafil if: 

  • you have severe heart problems
  • you have severe liver problems
  • you have recently had a stroke or heart attack
  • you have low blood pressure
  • you have certain, rare inherited eye diseases e.g. retinitis pigmentosa
  • you have ever had a loss of vision due to non-arteritic anterior ischemic optic neuropathy (NAION)

And talk to your doctor or Chemist4U pharmacist before taking this medicine if:

  • you have sickle-cell anaemia
  • you have leukaemia
  • you have multiple myeloma
  • you have a deformity of your penis or Peyronie's disease
  • you have problems with your heart
  • you have a stomach ulcer or a bleeding problem e.g. haemophilia

 

Sildenafil Tablets (Generic Viagra) Reviews

white-star
By Julie,
November 07, 2025
Not work for me
white-star white-star white-star white-star white-star
By Peter Cogan,
October 14, 2025
Product is great, but not useful if company cannot deliver it to the correct address, or help you later the delivery
white-star white-star white-star white-star white-star
By Robert Pinon,
September 24, 2025
Good Product :-)
white-star white-star white-star white-star white-star
By Paul Simpson,
August 26, 2025
Excellent
white-star white-star white-star white-star white-star
By Bruce Fox,
July 29, 2025
Very good product, very much cheaper than viagra and you get the same result.

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Getting an erection is a complicated process. It involves your brain, hormones, emotions, nerves, muscles, and blood vessels all working in harmony. So, when something affects any of these, it can lead to erectile dysfunction (ED). And this includes diabetes.  Let’s look at how diabetes and erectile dysfunction are connected...
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Frequently asked questions about sildenafil

Is sildenafil the same as Viagra?

Sildenafil is both a generic drug and the active ingredient in Viagra. This means sildenafil, Viagra, and Viagra Connect all work in the same way, and have the same side effects. However, because sildenafil is a generic drug, it is typically cheaper than either of those medications.

Is sildenafil cheaper than Viagra?

Yes, sildenafil is usually cheaper than Viagra. This is because sildenafil is the generic version of Viagra. So, just like ibuprofen is usually cheaper than Nurofen, sildenafil will normally cost less than a brand-name ED pill like Viagra.

Is sildenafil as strong as Viagra?

Sildenafil is just as strong as Viagra, as long as you are comparing the same dose. For example, a 50mg sildenafil tablet is the same strength as a 50mg Viagra tablet.

Does sildenafil make you last longer in bed?

Sildenafil can help you last longer in bed if your problem is getting and maintaining an erection. However, if your issue is premature ejaculation, sildenafil won’t help you. Instead, you could consider Priligy tablets or desensitizing spray.

Why can’t I drink grapefruit juice when I’m taking Sildenafil?

You shouldn’t eat grapefruit or drink grapefruit juice while taking sildenafil, as they can affect your treatment. This is because it can end up causing there to be more sildenafil in your bloodstream than the recommended dosage, potentially causing worse side effects in the process.

What is the difference between tadalafil and sildenafil (Viagra)?

Sildenafil (generic Viagra) and tadalafil (generic Cialis) are both active ingredients in erectile dysfunction pills. The main difference is that sildenafil can act slightly faster, but tadalafil lasts longer. You can find out more in our guide explaining the differences between Cialis vs Viagra.

Can women take sildenafil?

Sildenafil is not licensed for use by women or people assigned female at birth.

Can I drink alcohol when taking sildenafil?

While you can drink alcohol when taking sildenafilit’s recommended that you don’t. This is because drinking too much alcohol can cause erectile dysfunction, even if you have taken an ED pill.  

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