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Sildenafil Citrate

Sildenafil is the name given to the generic medication better known as Viagra. It performs the same function as the branded version.

PLEASE NOTE: As this treatment is a generic medicine, the brand of the product you receive may be different to the one shown in the picture.

To buy Sildenafil online, take our confidential questionnaires today. Once approved by our prescriber, our UK pharmacy will dispense your treatment. Orders are shipped by tracked 24-hour courier.

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Sildenafil is the name given to the generic medication better known as Viagra. It performs the same function as the branded version.

PLEASE NOTE: As this treatment is a generic medicine, the brand of the product you receive may be different to the one shown in the picture.

To buy Sildenafil online, take our confidential questionnaires today. Once approved by our prescriber, our UK pharmacy will dispense your treatment. Orders are shipped by tracked 24-hour courier.

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Product information

Sildenafil is the name given to the generic version of the blue pill used to treat erectile dysfunction. This is why Sildenafil is often known as “generic Viagra”. The branded treatment originally came onto the market in 1998, and was made exclusively by Pfizer until 2013, when the patent became available to other manufacturers. The name Sildenafil comes from the name of the main functioning ingredient in Viagra, sildenafil citrate.

How many men experience erectile dysfunction worldwide?

Although erectile dysfunction, or ED, is often referred to in medical terms as a ‘condition’, it is thought that it will affect most men at some stage during their sexually active lives. In fact, it is estimated that over 20 million men have sought treatment for the situation worldwide.

Because it is so common, and because of the more private nature of it, ED is not always an easy condition to diagnose, but most would define it as being apparent when a lack of erectile activity persistently presents a considerable obstacle to regular sexual intercourse.

What factors lead to ED?

Stress is often the cause of symptoms in those who experience ED at a younger age. This might be brought on by issues at work, or by the pressure of a sexual situation.

However, ED is much more likely to occur in men over a certain age. Lifestyle habits and lower circulation can contribute to the condition, which is thought to affect over a third of all men in the UK over the age of 60, and as many as 50 per cent of men aged 70 and over.

How can ED be addressed?

Addressing related health issues can help, and so can treatment. Medications for ED aim to increase erectile function by improving blood flow. The presence of the condition often stems from a lack of adequate blood supply to the penis.

How does Sildenafil relieve symptoms of ED?

By alleviating restrictive tension in muscles and blood vessels close to the penis, Sildenafil increases the current of blood in that area, enabling more stable and durable erections.

Sildenafil is named after the main component of the drug, sildenafil citrate.

Those who buy Viagra or have done so before will recognise the name sildenafil, as it is the functioning agent in this drug too.

This substance belongs to a group of medicines which are referred to as PDE5 inhibitors. Phosphodiesterase 5 (or PDE5) is a naturally-occurring enzyme in the male body, which helps to regulate blood flow. Sometimes, this enzyme can contribute to a restriction of blood flow to the penis, impairing erectile function.

PDE5 inhibitors like Sildenafil work by limiting the activity of the enzyme, and allowing muscle walls near the penis to relax and blood vessels in the area to widen. This helps to facilitate the movement of blood to the penis, and enables substantial erections.

Can I buy Sildenafil online?

As with most medications, you can buy Sildenafil tablets in a range of different dosage amounts, including 25, 50 and 100 milligrams. 50 mg is the typical inaugural dose for those who are trying this treatment for the first time. A doctor may see fit to increase or decrease the dosage, depending on how the user reacts to the treatment.

At present, Sildenafil is one of only three generic medicines for ED currently available on the UK market (the others being Tadalafil and Vardenafil). You should never use treatments made by companies you don’t know and trust, and when you buy Viagra or sildenafil online, you should always use a GPhC registered pharmacy.

How is Sildenafil different to the branded version?

Viagra is the name of the original drug made by Pfizer containing the active ingredient sildenafil, and was the first prescription pill to be released on the market for the treatment of ED. Between its 1998 release and 2013, Pfizer owned the exclusive rights to produce a drug containing sildenafil for this purpose.

In 2013, this patent expired, permitting other companies to produce their own versions of the drug. These companies are however unable to call their sildenafil products Viagra, as Pfizer continued to have sole ownership of this name. The hard tablet versions produced by other companies must be simply named Sildenafil.

Sildenafil is a type of medicine called a generic. This is why it is widely referred to as generic Viagra.

There are regulations governing generics concerning their manufacture. Consequently, generic sildenafil must contain the same active ingredients in the same amounts and be manufactured under the same conditions as Viagra. So, just as you can buy Viagra in 25mg, 50mg and 100mg doses, you can also buy Sildenafil in these same dose denominations.

Interestingly, while other companies began manufacturing sildenafil for ED patients to buy in 2013, Pfizer has also entered the generic sildenafil market in addition to continuing to produce Viagra.

So even those who choose to buy Sildenafil over Viagra might in some cases still be getting a Pfizer-made treatment.

Do I need a prescription to buy Sildenafil tablets?

Yes. Because the contents of Viagra and Sildenafil are the same the UK requirements for patients to buy them from pharmacies are also the same. This means that you will need to complete a consultation with a doctor and have a prescription issued for sildenafil before a pharmacy can provide it, just as you would if you were looking to buy Viagra online or in person.

Get treatment online

We understand how daunting it can be for those looking to buy generic Viagra or Sildenafil tablets online for the first time. For this reason, we offer a simple and confidential consultation service, staffed by GMC-registered doctors and UK pharmacy prescribers. They will assess your suitability for the treatment, and will only approve orders in instances which they are confident are safe. Once confirmed, your medication will be shipped to you by secure 24-hour courier.

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Page last reviewed:  24/02/2020


Sildenafil, like any medicine, needs to be taken in the correct way to help maximise its efficiency and reduce the risk of causing adverse effects. Before you buy and use Sildenafil tablets, read the patient information supplied to ensure you know how it works and how to take it.

  1. Take Sildenafil around 60 minutes before you intend to have sex.
  2. Do not take more than one tablet in any 24-hour period, and never exceed the dose prescribed by your physician.
  3. Sildenafil may take longer to work if it is taken after consuming a large meal.
  4. You will need to be sexually aroused in order for the treatment to be effective.

Ensure you fully familiarise yourself with the patient information leaflet before using this medicine. If you have any further questions, speak to an appropriate healthcare professional.

Using recreational drugs at the same time as Sildenafil can cause very harmful adverse reactions. You must not take recreational drugs if you plan to take Sildenafil.

Page last reviewed:  24/02/2020
Please read the patient information leaflet for this medicine fully before use:

Sildenafil 25mg

Sildenafil 50mg

Sildenafil 100mg

Side effects & Warnings

Side effects

As with any treatment for ED, Sildenafil is not suitable for absolutely everyone. It is advisable to be aware of the side effects the medication may induce before you buy and use Sildenafil so that you can respond accordingly in the event that they occur.

Very Common (1 in 10 people):


Uncommon (1 in 100 people):

Facial flushing; dizziness; indigestion; problems with sight, such as increased sensitivity to light, blurriness or colour-tingeing; nasal stuffiness.

Rare (1 in 1000 people):

Nausea; vomiting; bloodshot eyes; increased heart rate; muscle pain; drowsiness; urinary bleeding; penile bleeding; chest pain.

The side effects listed above are a selection only. For a more complete list, please read the patient information leaflet or check with your doctor. If you experience any of the above or notice anything unusual when taking this treatment, seek medical attention right away.

Taking it with other medicines

In the event that you are using other medication when undergoing consultation for this treatment, you should disclose the nature of these to your doctor, whether they are prescription, non-prescription or remedial. Do not cease or commence taking any other treatments without first speaking to your physician.

Medications for angina, for irregular heartbeat, nitrate-based medicines, HIV treatments, blood pressure treatments and medications for enlarged prostates may affect or inhibit your suitability to Sildenafil.

Under no circumstances should you ever use Sildenafil in addition to other treatments for impotence, or vice versa.

Conditions to look out for

When you buy Viagra or Sildenafil, or any other ED medication from our pharmacy, you will be asked to fill in a simple questionnaire. This allows our prescribing doctor to assess your suitability to the drug.

Notify our prescribing doctor if you have or have ever had: heart-, kidney- or liver-related illnesses; eye diseases; a stroke; a heart attack; a condition which affects the form or tissue of the penis; a deformed penis; sickle cell anaemia; leukaemia; multiple myeloma; bleeding issues; or stomach ulcers. A presence of any of these conditions may mean that this medicine is not safe for you to use, or that you may need to be prescribed a reduced dose.

At, we appreciate that it can be a little daunting knowing which ED treatment to buy first time around, but we can help you find the right product for you. Fill out our medical questionnaire today, and a doctor will review your responses. If they are satisfied that medication is the correct one for you, they’ll issue a prescription and we’ll deliver direct to your door, within one working day of approval.

Pregnancy and breastfeeding

This medication should not be used by women.

Driving and using machinery

Sildenafil may cause side effects which hinder vision and coordination. If you are affected by these, do not drive or try to operate machines.

Food, drink and alcohol

If you take Sildenafil with a large meal, it may take longer to work. Alcohol can impair your capacity to get an erection so it is recommended not to drink in excessive amounts when using this treatment.

Recreational drugs

Do not take recreational drugs if you plan to take Sildenafil. Doing so can be very dangerous.

Lactose intolerance

These tablets contain lactose. Inform your prescriber if you have an intolerance to certain sugars.

Page last reviewed:  24/02/2020
Please read the patient information leaflet for this medicine fully before use:

Sildenafil 25mg

Sildenafil 50mg

Sildenafil 100mg


Can I still drink alcohol?

We advise against it, as alcohol may reduce the effectiveness of this medicine, and can be a contributory factor in the cause of erectile dysfunction.

Will I still be able to drive?

The treatment should not directly affect your capacity to drive. But if you experience any adverse effects which could affect your judgment or motor functions, you should avoid driving or operating heavy machinery.

How should I store it?

The tablets needs to be kept at room temperature in a dry environment. Keep them sealed in their respective blister packs until you intend to take them.

Am I allergic to anything in the medicine?

As well as the active ingredient sildenafil citrate, sildenafil tablets contain microcrystalline cellulose, calcium hydrogen phosphate (anhydrous), croscarmellose sodium, magnesium stearate, hypromellose, lactose, triacetin and titanium dioxide (E171).

If you are allergic to any of these elements, do not use this treatment.

Is it available over-the-counter?

No. You will need a prescription to buy Sildenafil. You can obtain one by filling out our medical survey, which will be checked by one of our GMC-registered general practitioners or UK pharmacy prescribers.

Can I get Sildenafil somewhere online?

It's important to ensure that this medicine is suitable for you before use; particularly if you haven't used it before.

We advise men who haven't used this particular ED treatment before to select the lowest dose if they're ordering with us, or to see their doctor in person to discuss the treatment further.

If you are looking to renew your prescription and buy Sildenafil online, take our questionnaire to start your consultation, and one of our medical team will review the answers you give. If they approve your order, a prescription will be generated. We will then dispense your medication and transport it to you via next-day courier.

Page last reviewed:  24/02/2020
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