Based on 32 reviews

Available in multiple pack sizes

Strength & Quantity
25mg - Pack of 4
50mg - Pack of 4
50mg - Pack of 24
50mg - Pack of 64
100mg - Pack of 4
100mg - Pack of 24
100mg - Pack of 64
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Laura Henderson - Medical Content Writer
Laura Henderson
Medical Content Writer
James O'Loan - CEO & Superintendent Pharmacist
James O'Loan
CEO & Superintendent Pharmacist

Buy sildenafil online

Sildenafil is a medication that can treat erectile dysfunction, helping you to get and maintain an erection during sex. Sildenafil is the active ingredient in Viagra, which means that this medication works in the same way as the branded product, and is just as effective. If you’re looking for a way to treat your premature ejaculation and help to keep an erection, sildenafil could be the ideal treatment for you.


How sildenafil works

Sildenafil is an active ingredient which is part of a group of medications called phosphodiesterase type 5 (PDE5) inhibitors. It treats erectile dysfunction by relaxing the blood vessels in your penis, making it easier for blood to flow to the area. This makes it easier for your penis to get the blood flow it needs to become erect and stay erect.



You should follow the dosage and any instructions given to you by your doctor when taking this product. The usual dose you’ll be given to begin with is 50mg of sildenafil, but this may be increased or reduced by your doctor depending on how you react to the medication. Take your tablet around an hour before you are planning on having sex, and swallow whole with a glass of water. You can take this product with food, but be aware that it may take longer to work if you have eaten a heavy meal. You will need to be sexually stimulated for sildenafil to work, just as you would to obtain an erection without taking this medication.


Side effects

Like all medications, sildenafil can have side effects, although not everyone will experience them. Other common side effects you may experience include:

  • Headache
  • Nausea
  • Facial flushing
  • Hot flush
  • Indigestion
  • Colour tinge to your vision
  • Blurred vision
  • Visual disturbance
  • Stuffy nose
  • Dizziness

For a complete list of potential side effects, please see the patient information leaflet included with your medication. If you experience these or any other side effects, stop use and speak to your doctor or pharmacist. For more information about reporting the side effects of medication, please see the MHRA’s Yellow Card Scheme.


Serious side effects

If you experience any of the following side effects, stop use and seek medical assistance immediately:

  • Symptoms of an allergic reaction, e.g. wheezing, difficulty breathing, dizziness, swelling of face, mouth, tongue, or throat
  • Chest pains – if this happens to you, get into a semi-sitting position and relax. Do not take nitrates
  • Prolonged and sometimes painful erections – if your erection lasts for over 4 hours, speak to your doctor right away
  • Sudden decrease or loss of vision
  • Serious skin reactions, e.g. severe peeling, swelling, blistering of the mouth, genitals, or around the eyes, fever
  • Seizures or fits



Do not take sildenafil if you are under the age of 18. This product should not be taken by women. Do not use this product if you are allergic to sildenafil or any of the other listed ingredients. Do not take this product if you have:

  • Severe heart or liver problems
  • Recently had a stroke or heart attack
  • Low blood pressure
  • Certain rare inherited eye diseases, e.g. retinitis pigmentosa
  • Loss of vision due to non-arteritic anterior ischaemic optic neuropathy (NAION)

Speak to your doctor or pharmacist before taking this product if you have:

  • Deformity of the penis or Peyronie’s disease
  • Heart problems
  • A stomach ulcer, or bleeding problem, e.g. haemophilia
  • Sudden decrease or loss of vision
  • Liver or kidney problems
  • An intolerance to some sugars, as this product contains lactose


Other medication

If you’re taking any other medication, you should speak to your doctor or pharmacist before taking this product. Do not take sildenafil if you are already taking:

  • Medicines called nitrates, which are often used for chest pain or angina
  • Any medications known as nitric oxide donors, e.g. amyl nitrate (also known as poppers)
  • Riociguat, which is used to treat high blood pressure in the lungs

Speak to your doctor before taking this product if you are taking:

  • Protease inhibitors, which are used to treat HIV
  • Alpha-blockers, which are used to treat high blood pressure
  • Any other erectile dysfunction treatments
  • Any other medications



You should not drink alcohol while taking sildenafil, as it can affect your ability to get an erection.



You may feel dizzy after taking sildenafil. If you experience this or any other side effect that affects your awareness, do not attempt to drive or operate any tools or machinery until you are absolutely certain that you are safe to do so.


Important information

This product is a medicine; make sure to speak to your doctor or Chemist4U pharmacist before taking this product if you have an underlying medical problem or are taking any other medicine or complementary therapy. If your symptoms get worse or continue after taking this product, contact us or your doctor. For medical services in your area, please refer to

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or our pharmacist before taking this product. If you suffer from any allergies, ask your doctor or our pharmacist if this medicine is right for you.

Store all medicines out of sight and reach of children.

Please read the included leaflet carefully before using this product.

Please contact your GP if appropriate regarding this product.



Store in a cool, dry place which is below 30 degrees C. Do not use this product if the expiry date printed on the original packaging has passed. Keep out of sight and reach of children.

Sildenafil Reviews

By James King,
June 18, 2024
It's hard not to like this product.
By Mark Spendlove,
June 11, 2024
Great service easy site
By Mankit Wong,
May 20, 2024
Effective product which do the job for my purpose of use. Little side effects
By Ian Crick,
May 14, 2024
Great product
By Premier Blinds (wales) Ltd,
May 07, 2024
Spot on, never a problem

Advice & Guides

The most common medications that cause erectile dysfunction

      Could your medication be causing erectile dysfunction? Some recreational, prescription and everyday over-the-counter medications such as painkillers and antihistamines can potentially cause erectile dysfunction. Some medicines can affect sex drive and blood flow to the penis, all of which can hinder sexual function and performance. While there...
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9 ways to support your partner with erectile dysfunction

Is your partner’s erectile dysfunction causing problems in your relationship? If so, you're not alone. Many couples find themselves grappling with the challenges that come about when a partner experiences erectile dysfunction (ED). It's important to remember that ED is a common condition that affects millions of men worldwide, and...
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Is your mental health causing erectile dysfunction?

Is your mental health impacting your sex life? Can stress cause erectile dysfunction (ED)? Erectile dysfunction and mental health can leave you in a cycle that doesn’t seem to end. Many men suffer from depression and anxiety, with erectile dysfunction being potentially triggered by different psychological and mental health issues...
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Erectile Dysfunction - Causes & Treatment

Erectile dysfunction (ED), sometimes referred to as impotence, is a common problem that many men face, but it’s more prevalent in men over the age of 40. Thankfully, it’s usually nothing to worry about – even so, it can be distressing. It’s defined by the inability to achieve and maintain...
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Frequently Asked Questions

What causes erectile dysfunction?

Erectile dysfunction, sometimes known as impotence, is a common problem amongst men and may be caused by age, being overweight, smoking, drinking too much alcohol, or having a medical condition like diabetes, high blood pressure, or cardiovascular disease.

The inability to create or maintain an erection happens when there isn’t enough blood flowing to the penis, if the penis cannot trap blood, or when the nerve signals don’t send the signal of arousal to the penis.

Diabetes can cause nerve damage in the penis, in addition to certain cancer treatments affecting its functionality.

Is Sildenafil suitable for women?

Sildenafil is not suitable for women, as it’s designed to treat erectile dysfunction.


If you’re a woman and you’re concerned about your partner’s erectile dysfunction or have any questions about any other sexual problems, ask a medical professional for advice.


Your doctor, pharmacist, or local sexual health clinic will be happy to answer any questions and provide any treatments you may need.

Do I need a prescription for this medication?

You do need a prescription for this medication in the UK.

Our healthcare professionals can provide prescriptions if they think this treatment would be right for you and your condition.

When you click the button which reads “Start Consultation” at the top of this page, you’ll see a short questionnaire set up by our healthcare team which is designed to help them understand your medical needs.

Just like an in-person consultation with your GP, our doctors will assess your answers to their questions and write a prescription for the treatment they think will be best for you.

You’ll then be able to pay for your medication and we’ll send it out to you quickly and in discreet packaging.

© 2024 Chemist4U. Innox Trading Ltd, 35-37 Greenhey Place, Skelmersdale, Lancashire, WN8 9SA, GB. All rights reserved. Registered and regulated UK pharmacy with the GPhC (registered premises 9011784). Registered in England No. 07262043 | VAT Registration No. GB140138454