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Sildenafil

Price range: £4.99 through £69.99

Sildenafil is a medication used to treat erectile dysfunction (ED) in men. It helps to achieve and maintain an erection when sexually aroused. Sildenafil works by increasing blood flow to the penis.

  • Works within 30-60 minutes
  • Generic version of Viagra
  • Best value ED treatment
  • Trial from £1
SKU: 42089311000001109 Category:

Buy Sildenafil Tablets Online in the UK

You can buy Sildenafil tablets to treat erectile dysfunction online from our registered online service.

After completing an online assessment, our UK registered and trained GP’s will review your assessment. If approved, a prescription will be issued which is passed on to our UK registered online pharmacy. The pharmacy team will dispense your order, and dispatch the medication to your chosen delivery address.

Summary

What is it? A treatment for erectile dysfunction in men
Dose Take one Sildenafil tablet about one hour before sex. For optimum performance, take on an empty stomach. The effects of Sildenafil can last between 4-6 hours.

50mg is the typical starting dose.

How does Sildenafil work Increases blood flow to the penis when sexually aroused.
Effectiveness ~84% of men will notice a firmer and longer-lasting erection
Common Side effects Nasal congestion, headaches, facial flushing, dizziness
Price Starting from £3.75
Strengths Available strengths of Sildenafil tablet are

  • Sildenafil 25mg
  • Sildenafil 50mg
  • Sildenafil 100mg

What Are Sildenafil Tablets?

Sildenafil tablets are a treatment for erectile dysfunction in men. They are the most widely prescribed treatment for erectile dysfunction in the UK.

Sildenafil is the generic form of the well-known drug, Viagra.

Sildenafil is significantly cheaper and is the version that is usually prescribed by the NHS. They are a popular choice of treatment for erectile dysfunction, as medically there is no difference between Sildenafil and its branded alternative.

Effectiveness

The effectiveness of Sildenafil is proven in clinical trials against placebo. In men who suffered from erectile dysfunction, ~80% of those who took Sildenafil managed to achieve an erection, compared to around 17% of the group who were given water pills.

How it works

Sildenafil is from a class of drug called PDE inhibitors and when taken causes blood vessels to relax. Men who suffer from ED are unable to pump enough blood into the penis to achieve a hard enough erection. Sildenafil works by stimulating blood flow to the penis when a man is sexually aroused. This helps men with ED to achieve firmer and longer-lasting erections.

How to take Sildenafil

The typical starting dose for Sildenafil is ONE 50mg tablet 30 minutes before sexual activity. Most men will find this dose effective, however, if 50mg is too strong, you may wish to half the tablet the next time you are taking the medication. If successful, a 25mg tablet may be more suitable for your next prescription.

If the 50mg does not achieve the desired result, you should try the same dose 2-3 more times, to see if you can achieve a satisfactory erection. If this is not successful, you can increase your dosage to 100mg.

If a 100mg dose is also ineffective, speak to us about the next steps. It is advised to try it at least 5 times before giving up. However, Sildenafil should not be taken more than once in 24 hours.

If you have already used a few erectile pills without success, a face to face referral may be required.

If you have not yet tried one of the other ED medications, you may find that Tadalafil or Vardenafil is effective for you.

Patients will find different drugs more effective. This does not necessarily mean one drug is more effective than another. It can be that your body responds slightly differently to a particular medication.

Sildenafil Dosage

Sildenafil is available in 3 strengths; Sildenafil 25mg, Sildenafil 50mg and Sildenafil 100mg. The strength required, will depend on the severity of your ED, and it may require a couple of trials to find the right strength for you. Below is a dosage table to describe which strength is typically used and when.

Strength Use
Sildenafil 25mg Tablet Typically used for men who have found that 50mg is too strong.
Sildenafil 50mg Tablet Usually, the recommended starting dosage.

Most men will find this delivers the desired response, and an erection sufficient for intercourse will be achieved.

Sildenafil 100mg Tablet Usually reserved for men who have not responded to the 50mg strength.

You shouldn’t start treatment at 100mg, as this can potentially lead to an erection that lasts too long or becomes painful.

Further Reading: Sildenafil 50mg vs 100mg

 

Side Effects

With all medication, there is always a risk of side effects occurring. Sildenafil is well tolerated, and most side effects will go away once your body is used to the treatment.

The most common side effects are

  • Headaches / Dizziness
  • Flushing
  • Runny/stuffed nose
  • Upset stomach / Nausea / Diarrhoea
  • Red and/or warm skin
  • Muscle pain / Back Pain
  • Blurred vision

The side effects listed below are more serious, and you should stop taking Sildenafil, and report these to your doctor or pharmacist immediately;.

  • An erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, seek medical help immediately. Priapism can permanently damage your penis.
  • Sudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). Stop taking Sildenafil and call your healthcare provider right away if you have sudden vision loss in one or both eyes..
  • Sudden hearing decrease or hearing loss. Some people may also have ringing in their ears (tinnitus) or dizziness. If you experience these symptoms, stop taking Sildenafil and contact a doctor right away.

Alternatives

Although Sildenafil provides the most affordable treatment, it may not always be best suited to your needs. Levitra (or Vardenafil) is the most suitable treatment for people who suffer from diabetes, while Cialis (or Tadalafil), provides a longer-lasting effect. There is also now an over the counter option of Sildenafil in the form of Viagra Connect. This contains Sildenafil 50mg.

Vitaros cream is another alternative to oral medications in treating erectile dysfunction. If you have difficulty swallowing tablets, Nipatra (chewable sildenafil), is available.

Sildenafil Oral Jelly is another alternative, however this is an unlicensed treatment in the UK, and is not available to buy from a legal online pharmacy.

You can also look at counselling since some men suffer from erectile dysfunction as a result of nerves. If you think your ED is psychological, therapy may provide long term benefits if successful.

Prices

Sildenafil 25mg Tablets (Viagra Generic)

2 tablets

£1.00

4 tablets

£5.89

8 tablets

£9.49

16 tablets

£17.19

 32 tablets

£32.49

64 tablets

£45.50

Sildenafil 50mg Tablets (Viagra Generic)

2 tablets

£4.25

4 tablets

£7.49

8 tablets

£13.89

16 tablets

£23.00

32 tablets

£44.00

64 tablets

£63.95

Sildenafil 100mg Tablets (Viagra Generic)

2 tablets

£4.75

4 tablets

£8.19

8 tablets

£15.24

16 tablets

£25.99

32 tablets

£42.95

64 tablets

£71.95

FAQ

Can you take Sildenafil for erectile dysfunction?

Yes. Sildenafil is the active ingredient in Viagra and is one of the most widely used drugs for erectile dysfunction.

What is Sildenafil?

Sildenafil is a drug used in the treatment of Erectile Dysfunction. It is the active ingredient in Viagra and is of the class of drugs known as PDE5 inhibitors.

How Does it Work?

Sildenafil is a class of drug (like Cialis / Tadalafil) known as a PDE-5 inhibitor. When sexually stimulated, it helps maintain a relaxed muscle state and increases blood flow to the penis which helps facilitate an erection

How much is Sildenafil?

Sildenafil tablets can vary in price from genuine UK online pharmacies, from between £0.98 / Tablet, to £10.40 / tablet, depending on strength and quantity

What is the dosage of Sildenafil?

Usually, when starting to take Sildenafil, your doctor will recommend starting on a 50mg dose. This means you will take a 50mg tablet, around 30-60 minutes before sexual activity. The maximum dose is 100mg in a 24 hour period.

How long does it take Sildenafil to take effect?

Sildenafil takes around 30-60 minutes to take effect, and so should generally be taken around half an hour before sexual activity.

What is the difference between Sildenafil and Viagra

Sildenafil is the generic form of the better known branded drug Viagra. This means that both medications contain exactly the same active ingredient.

Can I take Sildenafil at the same time as other Erectile Dysfunction Medication?

No. Sildenafil and other ED medications all work in the same way. This means that taking them together can result in overdose and an increased incidence of side effects.

What strengths is Sildenafil available in?

Sildenafil is available as Sildenafil 25mg, 50mg or 100mg Tablets.

How long does Sildenafil last?

The effects of Sildenafil may be noticeable for up to 4 hours after taking your dose.

What is Sildenafil TEVA?

TEVA Sildenafil is simply a specific manufacturer of Sildenafil. Please contact us if you require a specific manufacturer of Sildenafil.

What strengths does Sildenafil come in?

Sildenafil comes in three different strengths. Sildenafil 100mg is the strongest, and there are also 25mg and Sildenafil 50mg strengths available.

Can I buy Sildenafil online?

Yes. You can buy Sildenafil online in the UK, from our UK registered online pharmacy and doctor service.

Is it legal to buy Sildenafil online?

Yes. You can safely buy Sildenafil in the UK after completing our online doctor assessment. A legal prescription is issued to our pharmacy if your order is approved. We are regulated by the MHRA and GPHC.

What is better, Sildenafil or Tadalafil?

The main difference between Sildenafil and Tadalafil is that Tadalafil is longer acting, so you may notice the effects for longer.

What is cheaper, Sildenafil or Tadalafil?

Sildenafil is slightly cheaper than Tadalafil currently, but prices are coming down for Tadalafil, as it was only recently made available in the UK

Is chewable Sildenafil available?

Chewable Sildenafil, also known as Bluechew in the USA, is available as Nipatra in the UK.

General Information

What is Sildenafil?

Sildenafil is a PDE5 inhibitor used to treat erectile dysfunction (ED). It’s the generic version of Viagra and works by increasing blood flow to the penis during sexual stimulation.

Is Sildenafil the same as Viagra?

Yes. Sildenafil is the generic form of Viagra, containing the same active ingredient. The main difference is cost, as generics are typically cheaper.

Can Sildenafil treat other conditions?

Yes. Originally developed for pulmonary hypertension (under the name Revatio), it’s also prescribed off‑label for altitude sickness.

How does Sildenafil work?

It inhibits the PDE5 enzyme, relaxing blood vessels in the penis to improve blood flow, enabling an erection when sexually aroused.

Usage & Dosage

What is the standard dosage?

Typical doses are 25mg, 50mg, or 100mg. Most start with 50mg taken 30–60 minutes before sexual activity. The maximum dose is 100mg per 24 hours.

Can I adjust my dose?

Your doctor may adjust your dose based on effectiveness and side effects. Never exceed 100mg daily.

Should I take Sildenafil with food?

A light meal is acceptable, but avoid high‑fat meals as they can delay absorption by up to 1 hour.

What if I miss a dose?

Sildenafil is taken “as needed.” Simply skip the missed dose and take the next one when required.

Effectiveness & Results

How long does Sildenafil take to work?

Typically, it takes 30–60 minutes for Sildenafil to work, with effects lasting up to 4–5 hours.

What if Sildenafil doesn’t work?

Consult your doctor. Underlying health issues such as diabetes or vascular disease may require dose adjustments or alternative treatments.

Does Sildenafil cure ED?

No. It temporarily restores erectile function but does not address the underlying causes of ED.

Can I use Sildenafil for premature ejaculation?

It is not licensed for premature ejaculation, though some studies suggest it may help when used in combination with psychological therapy.

Side Effects & Safety

What are common side effects?

Common side effects include headaches, flushing, indigestion, nasal congestion, dizziness, and blurred vision.

Are there serious risks?

Rare but serious risks include priapism (a prolonged erection lasting more than 4 hours), sudden vision or hearing loss, and cardiovascular events. Seek immediate help if these occur.

Is Sildenafil safe for heart patients?

It is not recommended for patients taking nitrates (e.g., angina medication) or those with severe heart disease. A cardiac assessment may be necessary.

Can I use Sildenafil with alcohol?

Avoid excessive alcohol, as it can worsen side effects such as dizziness and may reduce the medication’s effectiveness.

Interactions

What drugs interact with Sildenafil?

Sildenafil interacts with nitrates (e.g., GTN spray) which can cause dangerous drops in blood pressure, alpha‑blockers (e.g., doxazosin), and other ED medications such as Tadalafil, increasing the risk of overdose.

Does Sildenafil affect blood pressure?

It may cause a temporary drop in blood pressure, especially if combined with alcohol or certain medications.

Storage

How should I store Sildenafil?

Store Sildenafil in a cool, dry place below 25°C. Protect from light and moisture, and keep it out of reach of children.

Does Sildenafil expire?

Yes. Discard expired tablets as they may lose potency or become unsafe.

Access & Cost

Is Sildenafil available on the NHS?

Yes, for erectile dysfunction if deemed clinically appropriate. Private prescriptions are also available.

Can I buy Sildenafil online?

Yes, from regulated UK online pharmacies (such as Simple Online Pharmacy) after a clinician approves your prescription.

How much does Sildenafil cost?

Prices range from approximately £0.71 per tablet (generic) to over £10 per tablet for branded Viagra, depending on strength and quantity.

Is a prescription required?

Yes. Sildenafil is a prescription‑only medication (POM) in the UK.

Are there cheaper alternatives?

Generic Sildenafil is the most cost‑effective option. Tadalafil (Cialis) is a longer‑acting alternative but is usually more expensive.

Treatment Comparison

Sildenafil Viagra Tadalafil Cialis Vardenafil Levitra Spedra
Active Ingredient Sildenafil Sildenafil Tadalafil Tadalafil Vardenafil Vardenafil Avanafil
Time to Take Effect 30-60 mins 30-60 mins 15-45 mins 15-45 mins 30-60 mins 30-60 mins 15-30 mins
Duration of Action 4-6 hours 4-6 hours 24-36 hours 24-36 hours 4-6 hours 4-6 hours 4-6 hours
Unique Feature Same active ingredient as Viagra Most well known Same active ingredient as Cialis Longest Acting Used for diabetics Used for diabetics Quickest Acting
Price Per Tablet From 78p From £4.84 From 67p From £2.26 From £2.74 From £2.97 From £2.97

Before taking Sildenafil or any medication, it is important to read the Patient Information Leaflet.

  • Sildenafil PIL

Cautions

Alpha-blockers and Sildenafil

If you are taking alpha-blocking medicines for high blood pressure or pulmonary arterial hypertension, such as tamsulosin or trazodone, you are advised to leave at least six hours between taking your alpha-blocker and Sildenafil.

Nitrates and Sildenafil

Sildenafil cannot be prescribed by our doctor if you are taking nicorandil or nitrate-based medication, such as GTN spray or isosorbide mononitrate tablets for angina, chest pain or heart problems. It is not recommended to take SIldenafil if you are at risk of a heart attack.

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