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Sildenafil (Viagra)

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  1. Click on the green "Back To Get Started" button, then click "Start Consultation" button on the next page.
  2. Fill in our short consultation form.
  3. Choose delivery method and mode of payment.
  4. Our team of expert prescribers will assess whether medication is suitable.
  5. If you get the green light and it is deemed suitable, your order will be processed quickly and efficiently.
Confidential Service

Your privacy is important, Prescription Doctor are committed to keeping your details completely confidential.

This is why we also take steps to conceal your prescription products under two layers of packaging.

Delivery and Packing
Discreet Delivery?

We have a commitment to delivering a discreet service and understand your need for privacy. We ship all orders via a trackable courier using discreet, plain packaging.

Do I Need to Wait in All Day for Delivery?

Once your order is dispatched you will receive a tracking number via sms and email.

Do You Deliver on Weekends?

We deliver medications between Monday and Saturday. You can upgrade to Saturday delivery on Friday.

My Order Hasn’t Arrived What Should I Do?

You should receive a tracking number with your order which you can use this number to track your parcel online. This should give you a clear indication of where your parcel is. If you haven’t received your parcel in the time frame given by our couriers, contact your local depot to find out where it is. You can also contact our support team who will do this for you.

Can I Be Notified by Text?

On checkout you will be asked to leave your mobile number so our courier can text you about the delivery. This is also useful if the courier has problems finding your address. We will not use your mobile number for anything else.

Payment Methods
How Can I Pay for My Order?

You can pay for your order using credit, debit card or via bank transfer.

I Don’t Have a Credit Card, How Can I Pay?

If you don’t have a credit or debit card you can pay via bank transfer. We will give you a unique reference number at checkout along with details of how to make the transfer. Once the money has cleared in our account, we will process your order.

How Do You Keep My Details Safe?

We are a completely secure site and take many measures to ensure your details are kept safe. We understand that you have a right to extreme privacy when purchasing sensitive health medications. All information that you provide to us is stored on our secure servers. Any payment transactions will be encrypted using SSL technology.

Payment and refunds?

You can pay for your order using credit, debit card and bank transfer.

Card Payment: Please notify us that you wish to cancel your order. Your refund will show available In 1 - 3 days.

Bank Transfer: A member of our team will contact you requesting for your bank details. These details are only used to transfer the funds back into your account.

Treatment Information

Table of contents

Patient Reviews: How Sildenafil (Viagra) Has Made a Difference

What is Sildenafil?

Sildenafil tablets are often referred to as generic or cheap Viagra. Both Viagra and Sildenafil contain the same active ingredient.

Viagra is a brand of Sildenafil marketed by Pfizer. However, the active ingredient is available from other manufacturers at a lower price.

Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor that works by relaxing the blood vessels, increasing the blood flow to the penis during sexual stimulation. This helps to improve the quality of erections.

During sexual arousal, tissues within the penis release a chemical called cyclic guanosine monophosphate (cGMP) which causes vasodilation (dilation of the blood vessels), increasing blood flow to the corpora cavernosa - a pair of cylindrical chambers which fill with blood, producing an erection.

PDE5 inhibitors, such as Sildenafil, stop the enzyme (phosphodiesterase) from degrading the cGMP. These cause blood vessels to stay dilated, resulting in a longer-lasting erection.

The medicine typically starts to work between 30 and 60 minutes after taking it, though the tablet can be taken up to 4 hours before engaging in sexual activity.

At least two-thirds of men who took Sildenafil for erectile dysfunction reported an improvement in erections. Please understand that Sildenafil is not an aphrodisiac and does not cause sexual excitement. Taking a tablet will not instantly cause an erection, but will make it easier for an erection to happen when sexually stimulated.

Warning: You should never take treatments for erectile dysfunction alongside medicines for premature ejaculation.

What is erectile dysfunction?

Erectile dysfunction is a term that broadly covers a wide range of symptoms. It can explain the inability to obtain an erection, the inability to sustain an erection or the inability to climax.

There are numerous physiological and psychological issues that can cause erectile dysfunction.

Psychological causes of erectile dysfunction include:

  • Stress
  • Anxiety
  • Depression

Physiological causes of erectile dysfunction include:

Erectile dysfunction may not affect men all the time. It is possible to experience erections in the morning soon after waking up, but not experience erections during sexual activity. If this is the case, there may be an emotional factor at play.

Speak to your doctor about the options available, including cognitive behavioural therapy (CBT), sex therapy or other psychotherapy treatments.

Sufferers of erectile dysfunction experience it differently from one another, which is why there are a variety of treatments for this condition, including different medication and psychologically therapeutic techniques.

What type of erectile dysfunction is Sildenafil suitable for?

Sildenafil is an erectile dysfunction medication that is suitable for those that have trouble obtaining an erection.

Where Cialis and Levitra work by sustaining an erection for someone who is already aroused and sexually stimulated, Sildenafil works similarly to Viagra, in that it increases blood flow to the penis just before sex begins.

How to take Sildenafil?

Take one Sildenafil tablet an hour before having sex. Swallow the tablet whole with a glass of water.

Sildenafil can be taken with or without a meal, though it will take longer to work if you take it after a heavy meal.

Do not crush or chew the tablet.

The effects of Sildenafil can last for up to four hours.

Do not take more than one Sildenafil tablet in any 24 hours.

Do not take Sildenafil tablets in combination with Sildenafil orodispersible tablets or any other erectile dysfunction treatment.

Our maximum quantity is 32 tablets which should last for 3 months. If you find you are using more or need more, please inform our doctor to determine it is safe for you to do so.

What forms of Sildenafil are available?

Sildenafil has different dosages. Our online doctor will prescribe the most suitable dosage for you, based on your medical questionnaire.

Sildenafil is available from our online prescription service in blister packs of 4, 8, 12, 16, 20, 24, 28 and 32 tablets. We offer 3 strengths; 25mg, 50mg and 100mg.

Our doctor will be able to advise which dosage is most suitable for you, based upon a medical questionnaire.

To begin your order, simply fill out our medical questionnaire and our online prescriber will determine whether Sildenafil is suitable for you.

Sildenafil oral jelly, also known as Kamagra, is not licensed for use in the UK and is therefore not available through our online prescription service.

If you have difficulty swallowing tablets, speak to your doctor. They may be able to recommend an alternative ED treatment for you.

Side effects and cautions

All medications carry risks and may not be suitable for you. Before you take Sildenafil, it's important to familiarise yourself with the information contained in the patient information leaflet enclosed with your medicine. This leaflet contains important information on how to take Sildenafil, side effects to be vigilant of and how to store your medicine. You should retain this leaflet for further references, should you need it.

Alternatively, you can view the patient information leaflet for Sildenafil online.

Who should not take Sildenafil?

Sildenafil is not suitable for everyone. It's important to discuss this treatment with your doctor to ensure it is safe for you to take.

Do not take Sildenafil if you;

  • Are taking medicines called Nitrates
  • Are using any medicines known as nitric oxide donors (amyl nitrate/"poppers")
  • Are taking riociguat
  • Have a severe heart or liver problem
  • Have recently had a stroke or heart attack
  • Have low blood pressure
  • Have certain rare inherited eye diseases (retinitis pigmentosa)
  • Have ever experienced the loss of vision due to non-arteritic anterior ischaemic optic neuropathy (NAION)

Speak to your doctor before taking Sildenafil if you:

  • Have heart, blood or circulation problems
  • Have problems with your liver or kidneys
  • Are taking any other kind of medication, especially any kind of erectile dysfunction treatment or nitrates (commonly prescribed for chest pain)
  • Have any deformity of the penis, such as scarring, severe curvature or Peyronie's disease
  • If you have vision problems.
  • Have a condition that causes prolonged erections (priapism)

If you are unsure whether Sildenafil (generic viagra) is suitable for you, speak to your doctor. Your doctor will be able to determine how safe it is for you to take Sildenafil based on your condition and medical history.

Side effects of Sildenafil

All medications have side effects, some worse than others. Educating yourself can significantly reduce your risk of side effects as you know just what to look for.

Side effects can include:

  • Dizziness
  • Headache
  • Vision problems
  • Back or chest pain
  • Skin problems
  • Increased heartbeat (tachycardia)
  • Awareness of heartbeat (palpitations)
  • Digestion problems.

This is not an exhaustive list of side effects. For further information regarding the safety of Sildenafil, as well as a complete list of side effects, please consult the patient information leaflet enclosed with your medicine.

If you experience any side effects, whether listed above or in the patient information leaflet, inform your doctor.

Allergic reaction

Do not take Sildenafil if you have previously experienced an allergic reaction to Sildenafil or any of the other ingredients listed in the patient information leaflet.

Sildenafil contains lactose. Speak to your doctor before taking Sildenafil if you have been told that you are allergic to some sugars.

If you experience the signs of an allergic reaction after taking Sildenafil, stop taking Sildenafil and seek emergency medical attention by going straight to your nearest accident and emergency department. Remember to take the packaging and any remaining medicine with you so doctor's know exactly what you have taken.

Signs of an allergic reaction include:

  • Chest tightening
  • Dry, red and cracked skin
  • Itchy, red watery eyes
  • Raised, itchy, red rash (hives)
  • Swelling of the lips, tongue, eyes or face
  • Tummy pain, nausea, vomiting or diarrhoea
  • Wheezing

Other safety information

If the treatment does not work, do not take another dose. Contact a doctor or pharmacist.

If you experience an erection lasting longer than 4 hours, consult a doctor immediately. If left untreated for longer than 6 hours, prolonged erections, known as priapism, can cause permanent, irreversible damage to the penile tissue.

Never take Sildenafil past the expiry date printed on the packaging. The date refers to the last day of the specified month.

Do not throw medicines away via household or water waste. Take any unwanted or expired medication to your local pharmacy and ask them to dispose of it safely on your behalf.

Always store medicine out of the sight and reach from children and pets.

Complete privacy guaranteed

For over six years we’ve been prescribing and dispensing erectile dysfunction prescription medication, such as Sildenafil, to those suffering from this common condition. Over this time we’ve perfected our service to offer complete discretion and strict confidentiality. We understand that erectile dysfunction is a sensitive matter for men, which is why we take every precautionary step to ensure your privacy when ordering medication through our service.

We also add extra layers of packaging to ensure the medication cannot be seen by prying eyes, even if the outer packaging becomes damaged. These extra layers of packaging provide an additional level of security to your order so that you can seek relief from erectile dysfunction in confidence.

We ensure your privacy is respected every step of the way - from the placement of the order, to our discreet delivery service.

Frequently asked questions

How long does it take for Sildenafil to work?

Sildenafil starts working between 30 and 60 minutes after taking it. It allows for an erection to occur up to 4 hours after taking it.

How long does Sildenafil last?

The effects of Sildenafil last for approximately 4 hours. This does not mean that an erection will last for 4 hours - it means that within 4 hours of taking Sildenafil, you should be able to achieve an erection easier.

Is Sildenafil the same as Viagra?

Viagra is a brand of Sildenafil marketed by Pfizer. Both medicines work in the same way and are used to treat erectile dysfunction in men. Sildenafil tablets are often referred to as generic Viagra because of this.

What would happen if I take too much Sildenafil?

Taking too much Sildenafil can cause side effects such as dizziness, headaches and indigestion.

What should I do if I accidentally take too much Sildenafil?

If you accidentally take more Sildenafil than you should, go straight to your nearest casualty department. Remember to take the packaging and any remaining tablets with you so that doctors know exactly what you took. Taking too much Sildenafil will not improve your erections more, but it can increase your risk of experiencing side effects.

What should I do if I experience an erection lasting more than 4 hours?

In rare circumstances, priapism may occur in people taking erectile dysfunction medication. Priapism is a long-lasting and sometimes painful erection. It is caused when blood flows into the penis but doesn't flow back out again. If you experience an erection lasting for more than 4 hours, go straight to your nearest casualty department. If priapism isn't treated quickly, it can cause severe damage to the penile tissue.

What should I do if I forget to take Sildenafil?

Sildenafil should be taken up between 30 minutes and an hour before you engage in sexual intercourse. If you do not take Sildenafil up to 4 hours before you have sex, you will likely experience erectile dysfunction. You should not take more Sildenafil to make up for a missed dose. Sildenafil should be taken when you need it - do not take Sildenafil every day.

Can I drink alcohol while taking Sildenafil?

Drinking alcohol may reduce the effectiveness of Sildenafil and make it more difficult to achieve an erection. For the best result with Sildenafil, you should avoid or limit your alcohol consumption before taking Sildenafil.

Does sildenafil make you last longer?

While sildenafil helps to achieve and sustain an erection in men with erectile dysfunction, it does not treat premature ejaculation. If you are experiencing premature ejaculation, speak to your doctor.

Can I take Sildenafil and Priligy together?

Priligy is a treatment for premature ejaculation. While both erectile dysfunction and premature ejaculation can be present at the same time, you should not take Sildenafil and Priligy together. Speak to your doctor if you are experiencing both erectile dysfunction and premature ejaculation.

Buy Sildenafil online

To buy Sildenafil (generic Viagra) online, just answer a few medical questions for our doctor to determine your suitability.

If you order sildenafil from Prescription Doctor before 3 pm Monday to Friday, you can receive your order the next day. You will be given a 1-hour window for delivery so you can work around the arrival of your package.

Table of contents

What is Sildenafil?

What is erectile dysfunction?

What types of erectile dysfunction is Sildenafil suitable for?

How to take Sildenafil?

What types of Sildenafil are available?

Side effects and cautions of Sildenafil

Complete privacy

Frequently asked questions

Buy Sildenafil online

Additional resources

What is the best erectile dysfunction treatment for me?

Why can't I get an erection?

How long does erectile dysfunction last after prostate surgery?

What is the difference between premature ejaculation and erectile dysfunction?


Aurobindo Pharma - Milpharm Ltd., 2020. Sildenafil 25mg film-coated tablets: Summary of Product Characteristics

NHS, 2019. Sildenafil (including Viagra)

Treatment information

  • Product name: Sildenafil
  • Active Ingredient(s): Sildenafil
  • Manufacturer: Various
  • Administration: Oral
  • Presentation: Tablets
  • Available Strength: 25 mg, 50 mg, 100 mg
  • Exemption: Subject to medical prescription
  • Application: Men over 18 with impotence/erectile dysfunction
  • Dosage: Take 1 tablet 30-60 minutes before sexual intercourse
  • Description: Sildenafil is the active ingredient for effective erectile dysfunction treatment
  • Drug class: PDE5 inhibitor
  • Alcohol Consumption: Alcohol may reduce the effects of impotence medication
  • Price: 9.99 GBP
Click here to view the Sildenafil (Viagra) - Patient Information Leaflet

Authored & Reviewed By

Mohamed Imran Lakhi

Mohamed Imran Lakhi

MPharm - Lead Pharmacist
Imran Lakhi is the superintendent pharmacist and founder at Prescription Doctor. He has been at the core of our team.

Published on: 18/01/2017 Reviewed on: 13/03/2024

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