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Sildenafil Tablets
25mg / 50mg / 100mg

From £3.49 See Prices

Sildenafil (generic Viagra) is an erectile dysfunction treatment. It is a cost-effective option and well tolerated by most men. Sildenafil tablets take around 30-60 minutes to work and lasts for up to 4 hours. 

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From £3.49

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Sildenafil PRICES

*Please note: We do NOT charge a prescription fee

Medicine 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

ABOUT Sildenafil Tablets

Buy sildenafil online

You can buy sildenafil online from our UK registered pharmacy without the need for a prescription. Sildenafil is a prescription-only medication, so you need to complete an online consultation which is assessed by a pharmacist. If it is safe to prescribe sildenafil tablets, we will issue a prescription and dispense it in house. Your order will be shipped to you in plain and discrete packaging, to an address of your choice. 

What is sildenafil?

Sildenafil is an erectile dysfunction treatment that belongs to the class of drugs known as PDE5 inhibitors. It is commonly referred to as “generic Viagra”, as it contains the same active ingredient, sildenafil citrate. 

Sildenafil helps men who suffer from erectile dysfunction to achieve and maintain an erection. It does this by increasing blood flow to the penis.

At least two thirds of men report improved erections after taking sildenafil, and sildenafil reviews suggest that it is a highly effective ED treatment.

Sildenafil comes in tablet form with varying strengths (25mg, 50mg, 100mg).

How does sildenafil work?

Sildenafil's mechanism of action allows more blood to enter the penis, upon sexual stimulation. 

When you are sexually aroused, a chemical messenger known as cGMP is released into the smooth muscle of the penis, allowing for an influx of blood. This causes an erection. An enzyme known as PDE5 breaks down cGMP, making it difficult to get an erection. Sildenafil blocks the action of PDE5 so that more blood can enter the penis. This helps to achieve and maintain an erection, firm enough for sexual activity. 

Important note: Sildenafil will not increase your sex drive. If you are experiencing low libido, you should visit your doctor or pharmacist.

Sildenafil dosage

If you are taking sildenafil for the first time, the recommended dose is 50mg. You should take one tablet around 60 minutes before sexual activity. If you are experiencing side effects which are bothering you, you should reduce the dose to 25mg. 

If you feel that you are not experiencing desirable effects, you should increase the sildenafil dosage to 100mg. You should speak to your doctor or pharmacist before increasing or decreasing the dose of sildenafil.

Sildenafil 25mg tablets

Sildenafil 25mg is the lowest dose available. Your doctor or pharmacist may recommend that you take sildenafil 25mg tablets if you are using medication that can cause an interaction, or if you have certain medical conditions. Your doctor or pharmacist may also suggest that you try sildenafil 25mg tablets if you are experiencing side effects with the 50mg tablets.

Is sildenafil 25mg enough?

If sildenafil 50mg has worked, but you have experienced side effects, sildenafil 25mg can provide the same effect, with a lower chance of side effects. If you are taking certain medication, it may be a good option to start with the lowest dose, to reduce the chances of experiencing side effects.  

What if sildenafil 25mg does not work?

If sildenafil 25mg does not work and you are taking sildenafil for the first time, try taking it again. Current guidelines state that you should take the tablets on 8 separate occasions, before thinking about increasing the dose. You should discuss this with your pharmacist or doctor beforehand. If you are taking sildenafil 25mg to reduce side effects after having taken the 50mg tablets, follow the same advice. If you are still not experiencing the desired effect with the 25mg tablets, you may wish to speak to your doctor or pharmacist about an alternative treatment.

Can I take two sildenafil 25mg tablets?

If your doctor or pharmacist has instructed you to take 50mg, you can take two 25mg tablets to make up 50mg. You should not take two 25mg tablets at different times on the same day.

Sildenafil 50mg tablets

Sildenafil 50mg is the standard dose and the recommended starting dose if you have not taken sildenafil before. Most men will find that sildenafil 50mg tablets are effective and work well without intolerable side effects. If the 50mg tablets are not working well for you, your doctor or pharmacist may increase the dose to 100mg. 

Is sildenafil 50mg enough?

Sildenafil 50mg has the ability to produce the desired effect for many men. It is the recommended strength to start with, and the dose can be tapered up where there is no response, or tapered down, where there is a positive response to treatment, but side effects occur.

What if sildenafil 50mg does not work?

You should try taking sildenafil 50mg another 7 times. It can sometimes take a while to get used to the idea of taking a tablet before sex. External factors such as alcohol consumption, meal intake and frame of mind can also affect your response to treatment, so it may take a while before you figure out a routine that works best for you.

Can I take two sildenafil 50mg tablets?

You can take two sildenafil 50mg tablets to make 100mg, only if your doctor or pharmacist has advised you to. You should not take two sildenafil 50mg tablets at different times on the same day.

Sildenafil 100mg tablets

Sildenafil 100mg is the maximum dose that you can take. Your doctor or pharmacist may suggest that you try sildenafil 100mg tablets if the 50mg dose is not working well for you and you are not experiencing any side effects. There is a higher chance of experiencing side effects as you increase the strength.

Is sildenafil 100mg safe?

Sildenafil 100mg is the highest dose that can be used safely. It is usually used where there is limited response to the 50mg strength. This should only be done on advice of a doctor or pharmacist.

Can I split sildenafil 100mg tablets in half?

You are able to split sildenafil 100mg tablets in half to give you sildenafil 50mg. However, you run the risk of wastage if the tablet is not split accurately. If you wish to do this, you should use a pill cutter.

Can I take two sildenafil 100mg tablets?

You should not take two sildenafil 100mg tablets together, or on the same day. This can cause unpleasant side effects, including dizziness, headache and feeling sick. If you have taken more than 100mg of sildenafil in one day, seek medical attention. It is important to note that higher strength tablets will not work any quicker than the lower strengths, nor will it last for longer. Higher strength tablets are more likely to produce a response where there has been no response to the lower strengths.

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. 

How to take sildenafil tablets

You should take one tablet around 1 hour before sexual activity. Food can affect the absorption of sildenafil, so for best results, you should take sildenafil on an empty stomach or eat a light meal beforehand.

How long does sildenafil take to work?

Sildenafil tablets take around 30-60 minutes to kick in. The amount of sildenafil in your bloodstream peaks around 60 minutes after consumption, but it can take 30 minutes before it starts working. 

Sildenafil is most effective when taken on an empty stomach, as it acts quicker this way. You can take a tablet after eating a meal, but this can affect the absorption and sildenafil may take longer to take effect. Fatty meals make it more difficult for sildenafil to enter the bloodstream and you may not feel the full effect after a heavy meal.

How long does sildenafil last?

Sildenafil lasts for around 4 hours on average. This time frame may vary depending on certain factors. These include whether you take it on an empty stomach or after a meal, your metabolism, your weight, and the dose you take. Other factors such as your age, other medication you take, your general health and your state of mind can also affect how long the effects of sildenafil last.

Sildenafil side effects

Most men are able to take sildenafil, without experiencing side effects. 

The most common side effects, affecting 10% of men can include, headache, facial flushing, dizziness, stuffy nose, nausea, hot flush, indigestion, temporary visual disturbances such as blurred vision and colour tinge to vision). 

You should read the patient information leaflet supplied with your medication, for a full list of side effects. 

Serious adverse reactions are rare, but require urgent medical assistance. They can include swelling to any part of the face, difficulty breathing, chest pain, a prolonged and sometimes painful erection lasting longer than 4 hours, sudden loss of vision, severe skin reactions and seizures. 

If you are experiencing side effects, you should inform your doctor or pharmacist. They may wish to lower your dose to reduce the chances of experiencing side effects. 

Tip: Drinking plenty of water and avoiding alcohol can help to reduce the side effects of sildenafil. 

Is sildenafil safe?

Sildenafil is safe to take for a lengthy period of time. There do not appear to be any long-term side effects from taking it. However, if you have certain medical conditions, you should consult with your doctor to check that it is safe for you to take.

Please see NHS: Sildenafil (Viagra) online resource. 

Important note: You should not take sildenafil if you do not have ED. It will not make you last longer or give you a bigger erection. Taking sildenafil without ED can reduce your erectile confidence.

What if it is not working for me?

If sildenafil tablets are not working, you should continue to take the tablets and use them on 8 separate occasions. There may be several reasons why sildenafil is not working. You should try taking a tablet on an empty stomach, avoiding alcohol, and leaving enough time to allow the tablet to work. You may also want to try using sildenafil in different scenarios. 

If after 8 separate attempts you find that sildenafil is not providing the desired effect, you should speak to your doctor or pharmacist. There are alternative erectile dysfunction treatments such as:

Who should not take sildenafil?

You should not take sildenafil tablets if you have any of the following:

  • An allergy to any of the ingredients in the tablet
  • Recent issues with your heart such as a heart attack or stroke
  • Low blood pressure
  • Angina
  • Sickle-cell anaemia, an abnormality of your red blood cells.
  • Liver or kidney problem
  • Problems with your eyes (not including poor vision such which requires correcting with glasses)
  • Leukaemia, cancer of the blood
  • Bone marrow cancer
  • An anatomical deformation of the penis
  • Bleeding disorders
  • Stomach ulcers


You may be eligible for treatment, but you should speak to your doctor beforehand.

Sildenafil interactions with other medication

You should not take sildenafil if you have recently taken or you are currently taking medication called nitrates or nitric oxide donors, known as “poppers”. A combination can cause your blood pressure to drop to a dangerously low level. 

You should also not use sildenafil if you are taking riociguat, or other medication for erectile dysfunction, HIV medication, certain blood pressure medication or medication used to treat prostate enlargement.

Important note: There may be interactions with other medications. You should always inform your doctor or pharmacist of any medication or recreational drugs you are taking. Please make us aware of any medication you are taking, when you place your order. 

Can I drive or operate machinery after taking sildenafil?

Sildenafil may make you feel dizzy or lightheaded. You should assess your response to sildenafil before proceeding to drive or operate machinery.

Why are there different brands of sildenafil and what is the difference?

All drug manufacturers are free to produce sildenafil and many of them do. They are known as generic (non-branded) medicines. There is no difference in how effective each brand is. We obtain our stock from reputable UK wholesalers, and they all contain the same active ingredient, sildenafil citrate. There may be slight differences in the other ingredients, such as the binding agents (what holds the drug into place) and the colouring. Common generic brands we stock include Teva and Accord. However, we can also obtain Pfizer, Mylan, Bristol, Dr Reddy, Sandoz, Actavis and Torrent brands. If you wish to obtain a certain generic brand, please make a note of this on your consultation form. 

Can women take sildenafil tablets?

Sildenafil only works to treat erectile dysfunction and has no implication on libido or sexual desire. It should not be used by women and can potentially cause unwanted effects. 

Can I order sildenafil tablets online for my partner?

This consultation process has been designed to assess the individual seeking treatment. It should be treated similarly to a doctor's consultation and cannot be completed on behalf of someone else. This is for safety reasons and in the best interests of our patients.

Can I use more than one sildenafil tablet in a day?

You should not take more than one sildenafil tablet within a 24-hour period. If you feel that sildenafil is not effective, you should discuss increasing the dose or trying a new treatment with your doctor or pharmacist. 

Tip: Exceeding the prescribed dose can cause unwanted side effects. 

Can sildenafil tablets be cut in half?

It is possible to split sildenafil tablets in half. Some tablets are scored with a line down the middle, making it easier to break in half. For those that aren't you should use a tablet cutter. This helps to ensure tablets are split evenly and minimises wastage by reducing any residue that can fall off a tablet when split incorrectly. 

Can I use sildenafil with other treatments for ED?

Sildenafil should not be used together with other treatments for ED. This can result in an overdose which can be harmful to your health. You should leave a 24-hour gap between taking sildenafil and trying another ED treatment. 

Sildenafil and alcohol

Drinking alcohol whilst taking sildenafil can be safe, but only if you are drinking in moderation. Excess alcohol consumption can worsen the side effects of taking sildenafil and can contribute to erectile dysfunction. Alcohol slows down certain functions of the body. Sildenafil works to increase blood flow to the penis. Alcohol constricts blood vessels reducing blood flow, and as a result, can counteract the effects of the drug.

There are also long-term effects of drinking and using sildenafil. It can cause inflammation of the prostate gland, which is linked to erectile dysfunction. Excess alcohol consumption can also reduce testosterone levels, which contributes to ED.

Sildenafil vs Viagra

Sildenafil and Viagra both contain the same active ingredient, sildenafil citrate. They are medically equivalent and work in the same way. In essence, sildenafil is as good as Viagra. They also are identical in their efficacy, safety and side effects. Both are available in the same dosages (25mg, 50mg, 100mg).

The reason why Viagra is more expensive is because Pfizer developed Viagra in 1996, investing heavily in product development and marketing. Once their exclusive license to be the sole manufacturer expired, it gave an opportunity for other pharmaceutical companies to start manufacturing Sildenafil as a non-branded medication. 

Competition in the market is what keeps the price cheap. Most people who have taken Viagra will eventually turn to sildenafil, as it is a cheaper option that provides the same results. Sildenafil tablets are also more widely prescribed on the NHS than Viagra.

Tip: Generic sildenafil contains the same active ingredient, but is available at a much lower price. 

Sildenafil vs Cialis

Cialis is another form of medication used to treat erectile dysfunction. It has an advantage over sildenafil as it works in as little as 30 minutes, and has a longer duration of up to 36 hours. However, this can be a disadvantage if you experience side effects, as they are also likely to last longer. 

Whilst sildenafil has been around for longer than Cialis, both drugs have been around for over 18 years, and have proven to be safe and effective treatments for ED. Despite the differences between sildenafil and Cialis, both remain to be effective treatments for ED. 

Can you buy sildenafil over the counter?

You can get Sildenafil on the NHS or through a private prescription if you have erectile dysfunction. However, you do need a prescription that is authorised by a medical professional to buy sildenafil. Pharmacies such as Chemist Click allow you to buy sildenafil online, after the completion of an online consultation. We will dispense your prescription inhouse and post it to you in discreet packaging using a next day service. 

We stock most brands including Teva and Accord, although there is no clinical difference between brands. If you prefer a certain brand, please let us know once you place your order. 

Alternatively, you can visit your doctor who may be able to issue you with a prescription. You will need to take that to a pharmacy to have it dispensed. You can also buy sildenafil over the counter in the form of Viagra Connect or Eropid, but they are only available in a 50mg strength. You will need to have a consultation with a pharmacist to ensure that treatment is safe for you.

Last Updated

Side Effects

What are the side-effects of Sildenafil?

Like any form of medication, you should always take Sildenafil tablets with caution. As you may suspect, there are some side effects when it comes to taking Sildenafil. Luckily, these side effects are uncommon

It has been reported that some men in the past have experienced:

  • Headaches
  • Nausea
  • Vomiting
  • Diarrhoea
  • Back pain
  • Visual disturbances
  • Hot flushes
  • Allergic rash
  • Nasal congestion
  • Palpitations
  • Lightheadedness 


These side-effects affect around 1-10% of users and are temporary. To see a full list of side-effects, please read the Patient Information Leaflet

If you do experience any of these side effects and are concerned for your welfare, then it is strongly advised that you speak with your doctor to gain some expert advice as you may need to stop taking it. However, as previously mentioned, this is uncommon, so don’t fear the worst.


Patient Information Leaflet

For more information about Sildenafil erectile dysfunction treatment, take a look at the patient information leaflet below: 


Where can I find out more information about Sildenafil?

To find out more information about Sildenafil, visit the NHS website or take a look at some of our additional resources:

Product Reviews For Sildenafil Tablets


Due to the popularity of Sildenafil, there are plenty of reviews about the medicine online, and its average rating is quite high when it comes to treating erectile dysfunction. There are plenty of forums online for you to explore where users of Sildenafil share their experiences on how successful the medicine was and if it gave them any side effects. It is considered a successful form of medicine for erectile dysfunction, with many people using it across the globe. 



  • An effective product for most users
  • It’s cheaper than most counterparts
  • It only takes around 30 minutes to start working
  • Unlikely to encounter significant side effects


  • May not be as effective as its counterparts
  • It doesn’t last as long as other ED products like Tadalafil


Take a look at our dedicated sildenafil reviews page to find out what our customers are saying about this effective erectile dysfunction treatment.


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