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Sildenafil Tablets

From £5.89 See Prices

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

ABOUT Sildenafil Tablets

What are sildenafil tablets?

Sildenafil is an erectile dysfunction treatment which 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.

How does sildenafil work?

Sildenafil works by allowing the blood vessels in your penis to relax. This allows blood to enter, resulting in an erection.

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 blood can enter the penis and help to achieve and maintain an erection.

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

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.

What dose should I take?

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 dose 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.

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. 

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.

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 long does it take for sildenafil to take effect?

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 kick in. Fatty meals make it more difficult for sildenafil to enter the bloodstream and you may not feel the full effect if you take sildenafil 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 sildenafil lasts for.

How often can I take sildenafil?

Sildenafil is safe to take every day, but you should leave a 24 hour gap between doses. If you have certain medical conditions, you should consult with your doctor or pharmacist as you may need to limit your use of sildenafil.

Is sildenafil safe to take?

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 is safe for you to take.

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 are the side effects of sildenafil?

Common side effects of sildenafil include:

  • Headaches
  • Feeling dizzy
  • Facial flushing
  • Nasal congestions
  • Stomach problems such as nausea, indigestion
  • Visual disturbance such as colour distortions

You should read the full list of side effects in the Product Information Leaflet

Side effects are usually temporary and go away after a few hours. Not everyone suffers from side effects and many men take sildenafil without any side effects at all.

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

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, other medication for ED, HIV medication, certain blood pressure medication or medication used to treat prostate enlargement.

Important note: There may be interactions with other medication. You should always inform your doctor or pharmacist of any medication or recreational drugs you are taking.

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 a number of 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 tadalafil, vardenafil or avanafil, which are also effective.

What is the difference between sildenafil (generic Viagra) and 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 and is also known as “generic Viagra”.

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 low. Most people who have taken Viagra will eventually turn to sildenafil, as it is a cost-effective option that provides the same results.

Can I drink alcohol with sildenafil?

One or two units of alcohol is unlikely to have an effect on sildenafil. However, alcohol can reduce the ability to achieve and maintain an erection, so you should limit your alcohol intake. Excess alcohol consumption can stop sildenafil from working and increase the likelihood of unwanted side effects.

Can I buy sildenafil without a prescription?

You need a prescription to buy sildenafil. Online pharmacies such as Chemist Click can provide a prescription after completion of a medical assessment. 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.

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Side Effects

What are the side-effects of Sildenafil?

Sildenafil is usually well tolerated, but as with all medication, you may experience side-effects when taking sildenafil. 

Side effect can include:

  • ​​Headaches
  • Visual disturbance
  • Hot flush
  • Nasal congestion
  • Nausea/Indigestion

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

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.


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How long does sildenafil last?

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

All drug manufacturers are free to produce sildenafil and many of them do. There is no difference in how effective each brand is. We obtain our stock from reputable UK wholesalers and they all contain the active ingredient, sildenafil citrate. The only difference is in the other ingredients such as the binding agents (what holds the drug into place) and the colouring. Common brands we stock include Teva, Accord and Actavis.

Tadalafil has a longer duration of action than sildenafil. Sildenafil can work for up to 4-6 hours, whilst tadalafil has a window of action of up to 36 hours. Some people find that sildenafil works better than tadalafil, whilst others find that it's the other way around. You should try both to see what suits you best.

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

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. 

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 a clinician. 

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. 

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 will not increase your sex drive and will only work where there is sexual arousal. If you are suffering from low libido, you should visit your GP, as there may be an underlying cause. 

HOW TO USE Sildenafil Tablets

You should swallow one tablet with a glass of water, roughly 60 minutes before sex. You should take sildenafil before food on an empty stomach for best results. You can take sildenafil with food, but it may take longer for the effects to kick in.

Product Reviews For Sildenafil Tablets

Sildenafil PRICES

*Please note: We do NOT charge a prescription fee

Medicine x4 Tablets x8 Tablets x12 Tablets x16 Tablets x20 Tablets x24 Tablets x28 Tablets x32 Tablets x64 Tablets
Sildenafil Tablets 25mg 5.89 9.45 13.45 16.99 20.99 24.75 28.49 31.99 48.99
Sildenafil Tablets 50mg 7.49 13.89 19.99 24.99 30.99 36.49 41.99 46.99 64.89
Sildenafil Tablets 100mg 8.20 14.89 21.49 25.99 32.20 38.40 44.49 48.99 78.99


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