Viagra (Sildenafil)

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Medication Features

Viagra is a well-known sexual health medication that is used as an effective erectile dysfunction treatment (Fink et al, 2022; Goldstein et al, 1998; Wagner et al, 2001). The iconic little blue pill is an ED medication, containing the active ingredient Sildenafil which aids sexual arousal by helping you to get and keep a healthy erection by increasing blood flow to the blood vessels in the penis, aiding sexual intercourse. Viagra can help you to have a healthy sex life by giving you a little boost when you need it.

  • Popular ED treatment
  • Lasts up to 5 hours
  • Works in 30-60 minutes
  • Genuine medication
  • All drugs sourced in the UK
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A Doctor's Overview

GP and surgeon, Dr Shane Charles (MBBS, MRCS, PgDip SEM) provides a simple explanation of the medication below:

'Viagra (Sildenafil) is used to manage male erectile dysfunction and can also be used in the management of pulmonary hypertension. '.

If you think Viagra (Sildenafil) is a treatment that can help you, start an online consultation now for a registered prescriber to review. If treatment is deemed suitable, they can prescribe it, and we can deliver it to you from the comfort of your own home with a range of convenient delivery and payment options for you to choose from. If you have any questions about a medication, you should always consult your doctor with any questions prior to starting treatment, to ensure that it is safe and suitable for you.

Buying Viagra Online in the UK

Where can I buy Viagra?

You can buy Viagra in the UK from:

  1. Online Services: You can request Viagra tablets from a trusted online provider like UK Meds, pending a successful online consultation with a registered prescriber.
  2. Pharmacies: Most UK pharmacies can fill a private prescription for Viagra or provide Viagra Connect, an over-the-counter version that doesn’t require a prescription.

Keep in mind that branded Viagra is typically only available on the NHS in special circumstances. For most people, the generic version, sildenafil, may be prescribed instead.

Always ensure you purchase Viagra from a reputable pharmacy or online provider to guarantee safety and authenticity.

Can I get Viagra on the NHS?

You can get sildenafil, the active ingredient in Viagra, on the NHS if you have:

  • Erectile dysfunction (ED)
  • Pulmonary hypertension (a type of high blood pressure in the lungs)

However, the branded version, Viagra, is not typically available on NHS prescriptions unless there are special circumstances.

Speak to your GP to see if you qualify for sildenafil on the NHS and for guidance on managing your condition. For more information, visit the NHS website.

Can I buy Viagra online in the UK without a prescription?

In the UK, Viagra is a prescription-only medicine, so you’ll need a prescription to buy it online or in person.

  • You can get a private prescription for Viagra through an online consultation at UK Meds. A registered prescriber will assess your suitability during the consultation.
  • Can I buy Viagra over the counter?

  • If you’re looking for an over-the-counter alternativeViagra Connect is available without a prescription. However, you’ll still need to answer a few health questions from a pharmacist to ensure it’s safe for you.

Always ensure you buy Viagra from a reputable source and follow medical advice for its use.

Why is Viagra not as cheap as Sildenafil?

Manufacturers of branded Viagra, such as Pfizer, considers several factors when setting the price of Viagra, including:

  • Manufacturing costs
  • Research and development costs
  • Regulatory costs (e.g., obtaining approvals)
  • Packaging and distribution costs
  • Advertising and promotion expenses

Both Viagra and sildenafil contain the same active ingredient and work in the same way. If cost is a concern, you can discuss switching to sildenafil with your doctor or pharmacist.

Viagra UK

Yes, it is legal to buy Viagra (sildenafil) online in the UK, as long as you have a prescription.


How to buy Viagra online legally:

  1. Get a prescription:

    • If you don’t already have one, you can complete a quick and free online consultation through services like UK Meds.

    • An independent prescriber will review your information to ensure Viagra is safe and suitable for you.
  2. Genuine medication:

    • Always buy from a reputable provider, like UK Meds, which only works with registered UK pharmacies to supply 100% genuine medication.

Important Reminder

To stay safe, never buy Viagra from unregulated websites. Stick to trusted sources that follow UK healthcare regulations to protect your health and ensure the medicine is effective.

Yes, you can get Viagra (Sildenafil) on a subscription from UK Meds. By getting your medication on a subscription you can rest assured that you will get it when you need it, whilst also saving money compared to alternative Viagra subscription services such as Numan Viagra, Manual Viagra and Hims Viagra. It’s a win-win!

Viagra Boots

At the time of writing, Viagra (Sildenafil) is available at Boots. However, should you wish to purchase Viagra tablets at a much better price, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are require the medication regularly, order Viagra from UK Meds to benefit from our Viagra subscription purchase options.

Numan Viagra

At the time of writing, Viagra (Sildenafil) is available at Numan. However, should you wish to purchase Viagra tablets at a much better price, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Superdrug Viagra

At the time of writing, Viagra (Sildenafil) is available at Superdrug. However, should you wish to purchase Viagra tablets at a much better price, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Viagra Amazon UK

At the time of writing, Viagra (Sildenafil) is not available at Amazon. However, should you wish to purchase Viagra tablets online, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Tesco Viagra

At the time of writing, Viagra (Sildenafil) is not available at Tesco online. However, should you wish to purchase Viagra tablets online, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Tesco Viagra

At the time of writing, Viagra (Sildenafil) is available at Asda. However, should you wish to purchase Viagra tablets online at a much better price, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Lloyds Pharmacy Viagra

At the time of writing, Viagra (Sildenafil) is available at Lloyds Pharmacy. However, should you wish to purchase Viagra tablets online at a much better price, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Hims Viagra

At the time of writing, Viagra (Sildenafil) is available at Hims. However, should you wish to purchase Viagra tablets online at a much better price, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Manual Viagra

At the time of writing, Viagra (Sildenafil) is available at Manual. However, should you wish to purchase Viagra tablets online at a much better price, you can do so at UK Meds.

Additionally, if you would like to purchase more than one lot of Viagra pills, you can benefit from further savings at UK Meds. If you are interested in a repeat order for Viagra you can also benefit from our viagra subscription purchase options.

Viagra London

Yes. You can buy Viagra online in London at UK Meds. If you're a Londoner based in the English capital city and you require the erectile dysfunction medication, you can purchase it online with a valid prescription. If you require a prescription, simply complete our quick online consultation. Once it has been reviewed by an independent pharmacist prescriber you can buy Viagra online in London, from the comfort of your own home, provided that your prescription has been approved. You should always consult your doctor or healthcare professionals prior to starting treatment with any medication to ensure that it is safe and suitable for your individual needs.

For a detailed analysis you can also take a look at our dedicated guide to buying Viagra in the UK's capital city.

Viagra Glasgow

Yes. You can buy Viagra online in Glasgow at UK Meds. If you're a Glaswegian based in the Scottish city and you require the erectile dysfunction medication, you can purchase it online with a valid prescription. If you require a prescription, simply complete our quick online consultation. Once it has been reviewed by an independent pharmacist prescriber you can buy Viagra online in Glasgow, from the comfort of your own home, provided that your prescription has been approved. You should always consult your doctor or healthcare professionals prior to starting treatment with any medication to ensure that it is safe and suitable for your individual needs.

For a detailed analysis you can also take a look at our dedicated guide to buying Viagra in Glasgow.

Viagra Edinburgh

Yes. You can buy Viagra online in Edinburgh at UK Meds. If you're a Scottish person based in the Scottish capital city and you require the erectile dysfunction medication, you can purchase it online with a valid prescription. If you require a prescription, simply complete our quick online consultation. Once it has been reviewed by an independent pharmacist prescriber you can buy Viagra online in Edinburgh, from the comfort of your own home, provided that your prescription has been approved. You should always consult your doctor or healthcare provider prior to starting treatment with any medication to ensure that it is safe and suitable for your individual needs.

For a detailed analysis you can also take a look at our dedicated guide to buying Viagra in Edinburgh.

Viagra Manchester

Yes. You can buy Viagra online in Manchester at UK Meds. If you're a Mancunian based in the English city and you require the erectile dysfunction medication, you can purchase it online with a valid prescription. If you require a prescription, simply complete our quick online consultation. Once it has been reviewed by an independent pharmacist prescriber you can buy Viagra online in Manchester, from the comfort of your own home, provided that your prescription has been approved. You should always consult your doctor or healthcare provider prior to starting treatment with any medication to ensure that it is safe and suitable for your individual needs.

For a detailed analysis you can also take a look at our dedicated guide to buying Viagra in Manchester.

Viagra Leeds

Yes. You can buy Viagra online in Leeds at UK Meds. If you're a Loiner based in the English city and you require the erectile dysfunction medication, you can purchase it online with a valid prescription. If you require a prescription, simply complete our quick online consultation. Once it has been reviewed by an independent pharmacist prescriber you can buy Viagra online in Leeds, from the comfort of your own home, provided that your prescription has been approved. You should always consult your doctor or healthcare provider prior to starting treatment with any medication to ensure that it is safe and suitable for your individual needs.

For a detailed analysis you can also take a look at our dedicated guide to buying Viagra in Leeds.

Viagra Birmingham

Yes. You can buy Viagra online in Birmingham at UK Meds. If you're a Brummie based in the English city and you require the erectile dysfunction medication, you can purchase it online with a valid prescription. If you require a prescription, simply complete our quick online consultation. Once it has been reviewed by an independent pharmacist prescriber you can buy Viagra online in Birmingham, from the comfort of your own home, provided that your prescription has been approved. You should always consult your doctor or healthcare provider prior to starting treatment with any medication to ensure that it is safe and suitable for your individual needs.

For a detailed analysis you can also take a look at our dedicated guide to buying Viagra in Birmingham.

Viagra Leicester

Yes. You can buy Viagra online in Leicester at UK Meds. If you're based in Leicester and you require the erectile dysfunction medication, you can purchase it online with a valid prescription. If you require a prescription, simply complete our quick online consultation. Once it has been reviewed by an independent pharmacist prescriber you can buy Viagra online in Leicester, from the comfort of your own home, provided that your prescription has been approved. You should always consult your doctor or healthcare professionals prior to starting treatment with any medication to ensure that it is safe and suitable for your individual needs.

For a detailed analysis you can also take a look at our dedicated guide to buying Viagra in Leicester.

At UK Meds, prices for Viagra start from 96p per tablet*. It's also worth remembering that Viagra prices get cheaper when buying larger amounts, choosing the generic option (sildenafil) or if you are on a UK Meds Plus subscription.

Type of drugPhosphodiesterase (PDE5) inhibitors
Health conditions prescribed forErectile dysfunction (ED)
Active IngredientsSildenafil
Brand namesViagra, Viagra Connect
Available strengths25mg, 50mg, 100mg
Available asTablets
How long does it last?Up to 4 hours
How fast does it work?Within 30 - 60 minutes
Possible side effectsHeadache, dizziness, tiredness, nausea, blurred vision, indigestion, nasal congestion
Patient Information LeafletFor more information on the medication please refer to the patient information leaflet for Viagra.

Viagra - Key Information

What Is Viagra?

Viagra, often called the "little blue pill", is a well-known medicine used to treat erectile dysfunction (ED) in men aged 18 and over. It contains the active ingredient sildenafil, which belongs to a group of medicines called PDE5 inhibitors.

Viagra helps improve blood flow to the penis, making it easier to get and maintain an erection. However, it only works if you are sexually stimulated—it doesn’t cause an erection on its own.

Since its release in 1998, Viagra has been praised for revolutionising the treatment of ED and has become a trusted solution for many men.

For personalised advice, speak to your doctor or pharmacist.

Video Guide: Viagra

In this TikTok video guide to Viagra (Sildenafil) below, UK Meds answer common questions you should know about the erectile dysfunction (ED) drug:

@uk.meds

What is Viagra? @uk.meds #viagra #sildenafil #viagrasildenafil#viagrauk #erectiledysfunction #medtok

♬ original sound - UK.Meds

What is Sildenafil?

Sildenafil is the active ingredient in Viagra, a widely used treatment for erectile dysfunction (ED). It belongs to a group of medicines called PDE5 inhibitors.

Sildenafil helps by increasing blood flow to the penis when you’re sexually aroused, making it easier to get and maintain an erection. It only works if you’re sexually stimulated and doesn’t cause an erection on its own.

You can choose between branded Viagra and generic Sildenafil. Both work in the same way and are equally effective, but generic Sildenafil is more affordable than the branded version. Both options are available at UK Meds.

If you’re unsure which option is right for you, speak to your doctor for advice.

How does Viagra work?

Viagra, also known as sildenafil, is a medicine that helps men with erectile dysfunction. It belongs to a group of drugs called PDE-5 inhibitors. Viagra works by increasing blood flow to the penis, making it easier to get and maintain an erection.

Here’s how it works:

  • When you take Viagra, the active ingredient relaxes the blood vessels in the penis.
  • This allows more blood to flow into the area, which helps create an erection.

Viagra only works if you are sexually aroused. It won’t cause an erection on its own.

How effective Is Viagra?

Viagra has been shown to work well for most men:

  • 50mg dose: Effective for 74% of men.
  • 25mg dose: Effective for 62% of men.
  • 100mg dose: Effective for 82% of men.

This compares to lower success rates with a placebo (a pill with no medicine).

You can improve it's effectiveness with some simple lifestyle changes.

Viagra is a trusted and proven treatment for erectile dysfunction. Speak to your doctor to find the right dose for you.

Why do I need a prescription for Viagra?

Viagra is a prescription-only medicine, meaning a doctor must assess you to ensure it’s safe for you to take. This is because Viagra may:

  • Interact with certain medications you’re taking.
  • Be unsuitable if you have specific health conditions, such as heart problems or low blood pressure.

There is also a version called Viagra Connect, which is available without a doctor’s prescription. However, you’ll still need a consultation with a registered medical prescriber to confirm it’s appropriate for you.

What causes erectile dysfunction?

Erectile dysfunction (ED) is a common condition with various physical and psychological causes.

Physical causes include:

  • Obesity
  • Heart disease
  • High blood pressure

Psychological causes include:

  • Stress
  • Anxiety
  • Depression

Sometimes, ED can be caused by a combination of factors rather than just one issue. For tailored advice, consult a healthcare professional or read more about the causes of erectile dysfunction.

Google Web Story: A-Z Guide to Viagra

Our Google Web Story below provides a helpful A-Z guide to terminology relating to Viagra (sildenafil):

For more information on the medication, take a look at our A-Z guide to Viagra.

Usage Advice

How should I take Viagra?

To use Viagra effectively:

  1. Timing: Take one tablet about 1 hour before sex. Swallow it with a glass of water.
  2. Dosage: Only take 1 tablet in 24 hours—never exceed this dose.
  3. Food: For the best results, take Viagra on an empty stomach. If you eat, choose a light meal. Avoid heavy or greasy foods as they can slow down how quickly Viagra works.
  4. Alcohol: Limit or avoid alcohol. Alcohol can reduce Viagra’s effectiveness and make it harder to get an erection.

Follow your doctor’s instructions to ensure Viagra is safe and works well for you. If you have any concerns, speak to your healthcare provider.

When should I take Viagra?

Viagra typically starts working 30 to 60 minutes after you take it. For the best results:

  • Take Viagra about 1 hour before you plan to have sex.
  • Avoid taking it more than 4 to 6 hours before, as it may no longer be effective by then.

If Viagra doesn’t work because too much time has passed, you’ll need to wait until the next day to take another dose. Always follow your doctor’s advice for safe and effective use.

How long does Viagra take to work?

Viagra usually begins to work 30 to 60 minutes after you take it, so it’s a good idea to take it around 1 hour before sexual activity.

What can impact how quickly Viagra works?

  • Sexual Arousal: Viagra won’t work unless you’re sexually stimulated. Foreplay or intimacy with your partner can help kickstart the process while waiting for it to take effect. Without arousal, Viagra won’t produce results.
  • Food Choices: Heavy, greasy, or fatty meals can slow down Viagra’s effectiveness. For faster results, take it on an empty stomach or after a light meal.
  • Alcohol Consumption: Alcohol can reduce Viagra’s effectiveness and make it harder to achieve an erection. It’s best to avoid alcohol for optimal results.

By planning ahead and being mindful of these factors, you can maximise Viagra’s effectiveness. If you have any concerns, speak with your doctor or pharmacist.

How long does Viagra last?

Viagra can work for up to 4 hours after you take it, but this may vary depending on your body. If you’re planning to have sex in the evening, avoid taking it too early in the day, as you can only take one tablet every 24 hours. For the best results, take Viagra about 1 hour before you want to have sex.

What can affect how long Viagra lasts?

Several factors influence how long Viagra stays effective:

  • Age: Older people may find it lasts a little longer as the body processes the medication more slowly.
  • Health: Your overall health, especially conditions like diabetes or heart problems, can impact how it works.
  • Diet: Heavy or fatty meals can reduce how long Viagra remains effective.
  • Alcohol: Drinking alcohol can interfere with Viagra’s effectiveness and shorten its duration.

By timing your dose correctly and considering these factors, you can make the most of its effects. Always follow your doctor’s advice for safe and effective use.

How often should you take Viagra?

You should only take one Viagra tablet per day. Taking more than your prescribed dose—such as two doses in one day—can increase the risk of side effects and cause serious complications, including permanent damage to your penis.

What to do if your dose feels wrong:

  • If you think your dose is too strong or too weak, don’t adjust it yourself.
  • Speak to your doctor for advice—they can adjust your prescription to ensure it’s safe and effective for you.

Always follow your doctor’s instructions and take Viagra exactly as prescribed to avoid unnecessary risks. If you have concerns, consult a healthcare professional.

How should you store Viagra?

To keep Viagra safe and effective:

  • Storage: Store it at room temperature in a closed container.
  • Avoid: Keep it away from direct sunlight, moisture, and heat, as these can affect the medication.
  • Disposal: If your Viagra has expired, don’t use it. Ask your doctor or pharmacist how to dispose of it properly.

Always follow the instructions provided with your medication and keep it out of reach of children.

How should you dispose of Viagra (sildenafil) tablets?

If you need to get rid of unused or expired Viagra (sildenafil) tablets:

  • Take them to your local pharmacy for safe disposal.
  • Do not throw them in the bin or flush them down the toilet or drain, as this can harm the environment.

Always dispose of medicines responsibly. If you’re unsure, ask your pharmacist for advice.

Does Viagra expire?

Yes, Viagra has an expiry date and can become less effective or unsafe to use if it’s too old.

  • Check the expiry date: Always look at the date on your packet and don’t use Viagra after this date.
  • Expired medication: If your Viagra has expired, dispose of it safely by taking it to your local pharmacy and get a new prescription.

Using expired medication isn’t recommended as it may not work properly or could be unsafe. Always check your medication and speak to a pharmacist if unsure.

For more information on the prescription medication patients should refer to the Viagra (Sildenafil) patient information leaflet that comes with the erectile dysfunction drug.

Viagra Reviews

Read first hand what other UK Meds customers think about Viagra and it's impact on ED patients lives on our customer reviews above. For further context there are also a large selection of Viagra reviews describing what people think about their experiences with the medication available at Drugs.com and Web MD.

It is important to note that people may have different experiences when they use Viagra (sildenafil). If someone states that their medication did not work as they had hoped, it does not mean that it will not work for you. If you believe that Viagra is the right medication for you then the best thing to do is to consult your doctor or healthcare professional, and judge the medication based on your own experiences if they recommend it as a treatment. Before starting a medication you should always consult with your healthcare provider first to ensure that it is safe and suitable for your individual needs.

Dosage

What is the typical dosage for Viagra?

Viagra is available in three dosages: 25mg, 50mg, and 100mg. The higher the dosage, the stronger the effect, but this may also increase the risk of side effects. Your doctor can help you find the right dosage for your needs.

Viagra 50mg

  • This is the standard starting dose for most men and is recommended if you’re trying Viagra for the first time.
  • It’s the most popular dosage and works effectively for the majority of men.

Viagra 25mg

  • This is the lowest dose of Viagra and is less likely to cause side effects.
  • It may be a good option if:
    • You experienced side effects with 50mg.
    • You’re taking other medications that might interact with Viagra.

Viagra 100mg

  • This is the highest dose of Viagra and is more effective for some men, but it carries a higher risk of side effects.
  • It’s usually recommended if:
    • 50mg didn’t work for you.
    • You experienced no side effects on a lower dose.

Always start with the dosage recommended by your doctor. If the first dose doesn’t work as expected or causes side effects, consult your healthcare provider before trying a different strength.

Warnings

What warnings does Viagra come with?

Viagra is not suitable for everyone. You should not take Viagra if you:

  • Are under 18 years old or were assigned female at birth.
  • Do not have erectile dysfunction or are already taking other erectile dysfunction medications.
  • Are allergic to any ingredients in Viagra.
  • Have severe heart or liver problems, or have recently had a heart attack or stroke.
  • Have low blood pressure.
  • Have retinitis pigmentosa, an inherited eye disease, or have lost vision due to non-arteritic anterior ischaemic optic neuropathy (NAION).

Let Your Doctor Know If You Have:

  • Sickle cell anaemia, a stomach ulcer, or haemophilia (a blood clotting disorder).
  • Peyronie’s disease, a condition causing a deformity of the penis.

Medication Interactions

Viagra can interact with certain medications, potentially causing dangerous side effects. Inform your doctor if you take:

  • Nitrates for chest pain or nitric oxide donors like amyl nitrate ("poppers").
  • Riociguat or other PDE-5 inhibitors used for pulmonary hypertension.

Stay Safe

Always inform your doctor about your health conditions and any medications you’re taking before using Viagra. This helps avoid complications and ensures Viagra is safe and effective for you.

Side Effects

Viagra (sildenafil) can have a number of common side effects although everyone will not experience the same side effects when taking the medication.

Viagra (sildenafil) can have a number of common side effects although everyone will not experience the same side effects when taking the medication. They are more likely with higher doses. If you notice side effects, a lower dose may be more suitable. Always consult your doctor to find the best option for you.


Common side effects

These affect up to 1 in 10 people and are usually mild:

  • Headaches
  • Feeling sick (nausea)
  • Flushing (including facial flushing)
  • Indigestion
  • Vision disturbances
  • Dizziness
  • Stuffy nose

We've put together a table summarising the common side effects of Viagra (sildenafil) and the relevant actions to help you. Always consult with your doctor or healthcare provider if you are concerned about any potential side effects of Viagra (sildenafil) as soon as possible.

Viagra Side Effects

Recommended Actions

HeadachesRest and drink plenty of fluids; avoid alcohol; ask pharmacist for a painkiller; consult doctor if severe or lasts longer than a week
NauseaAvoid rich or spicy foods; take sildenafil after a meal or snack (if it is being taken for pulmonary hypertension)
FlushingCut down on coffee, tea, and alcohol; keep the room cool; use a fan; spray face with cool water or sip cold/iced drinks; consult doctor if it does not go away or causes problems
IndigestionTake an antacid for discomfort; consult doctor if bothersome; may prescribe an additional medicine to protect stomach
Stuffy NoseConsult pharmacist or doctor for recommended nasal spray
DizzinessGet up very slowly or stay sitting down until feeling better; lie down if feeling dizzy to avoid fainting; do not operate machinery or drive if feeling dizzy

Uncommon side effects

These occur in up to 1 in 100 people:

  • Being sick (vomiting)
  • Skin rash
  • Eye irritation or pain
  • Rapid heartbeat
  • Blood pressure changes
  • Dry mouth
  • Cold symptoms
  • Nosebleeds
  • Tiredness

Rare side effects

These affect up to 1 in 1,000 people and may be serious:

  • Fainting
  • Stroke
  • Heart attack
  • Irregular heartbeat
  • Sudden loss of hearing
  • Dry nose
  • Seizures

Serious side effects: Seek immediate help

Stop taking Viagra and call 999 or go to A&E if you experience:

  • Chest pains
  • Severe allergic reactions (difficulty breathing, wheezing, swelling of the face, lips, tongue, or eyelids).
  • Prolonged, painful erections (lasting more than 4 hours).
  • Sudden loss of vision.
  • Serious skin reactions (e.g., blistering or peeling).
  • Seizures

How long do Viagra side effects last?

Most side effects are mild and last only a few hours to a day. Headaches may persist for up to a week. Once the effects of Viagra wear off, side effects usually go away too.


What should I do if I experience side effects?

  • Speak to your doctor as soon as possible if you’re concerned or struggling to manage side effects. They may suggest a different dose or an alternative medication.
  • Report side effects (including those not listed in the leaflet) via the Yellow Card Scheme to help improve medication safety.

For serious side effects, stop taking Viagra immediately and contact emergency services. Always read the patient leaflet for full information or consult your healthcare provider.

Viagra FAQs

Below UK Meds answer the most commonly asked questions from our ED patients about Viagra:

Does Viagra work for everyone?

Viagra works for most men, but it doesn’t work for everyone.

  • If you’ve tried 25mg or 50mg several times and it hasn’t worked, your doctor might suggest increasing the dose to 100mg, the highest available strength.
  • If 100mg still doesn’t work, Viagra might not be the right medication for you.

There are other erectile dysfunction treatments available, and your doctor can help recommend an alternative that suits your individual needs. Always consult a healthcare professional before making changes to your medication.

Will Viagra (sildenafil) make me last longer in bed?

No, Viagra (sildenafil) does not affect how long you last during sex. Its main purpose is to help you get and maintain an erection, but it doesn’t impact timing or prevent premature ejaculation.

If you’re looking for ways to last longer in bed, speak to your doctor or healthcare provider. They can provide advice or recommend treatments tailored to your needs.

For more information, check out our guide: Does Viagra make you last longer?.

Will Viagra (sildenafil) make my erection bigger?

No, Viagra (sildenafil) will not make your penis bigger.

It works by increasing blood flow to the penis, which helps you get and maintain an erection when you’re sexually aroused. However, it does not change the size of your penis.

If you have questions about how Viagra works, speak to your doctor or pharmacist for more personalised advice. Always use Viagra as directed for safe and effective results.

Viagra (sildenafil) is not specifically designed to treat premature ejaculation (PE), but it may help in certain cases.

  • Studies suggest: Some research, like that by Wang et al. (2007), indicates sildenafil could be effective for PE.
  • Improves confidence: Other studies, such as McMahon et al. (2005), suggest that sildenafil doesn’t directly delay ejaculation but may boost confidence and increase perceived control over ejaculation.

If you experience premature ejaculation, it’s essential to consult your doctor or healthcare provider. They can help determine if sildenafil is a suitable option or recommend alternative treatments tailored to your needs.

If you have high blood pressure (hypertension), it’s important to speak to a doctor, pharmacist, or healthcare provider before taking Viagra.

  • A healthcare professional will assess whether Viagra is safe for you based on your medical history and any other medications you are taking.
  • If Viagra isn’t suitable, they may recommend an alternative treatment for erectile dysfunction (ED) that won’t affect your blood pressure.

Always follow your doctor’s advice to ensure your treatment is safe and effective.

No, it is not safe to take nitrate medicines (commonly used to treat chest pain) and Viagra (sildenafil) at the same time.

  • Why? Combining these medications can cause a dangerous drop in blood pressure, known as fatal hypotension. This can lead to serious side effects, including fainting, dizziness, or even life-threatening complications (Chamsi-Pasha, H., 2001).
  • Examples of Nitrate Medicines: Nitroglycerin, isosorbide dinitrate, or any medication classified as a nitric oxide donor.

Always consult your doctor, pharmacist, or healthcare provider if you are taking nitrate medicines before considering Viagra or any other erectile dysfunction treatment. Your healthcare professional will advise on safe and suitable alternatives.

Viagra (sildenafil) is not safe for men with certain types of heart disease or related conditions.

  • Why? Viagra works by widening blood vessels to improve blood flow, which can cause a dangerous drop in blood pressure in men with heart disease or those taking certain heart medications.
  • Heart disease and ED: Erectile dysfunction can sometimes be an early warning sign of heart disease, as conditions like atherosclerosis (narrowing of the arteries) may affect blood flow to the penis before impacting other areas of the body (British Heart Foundation, 2022).

What should you do?

  • Consult your doctor: Always speak to a doctor, pharmacist, or healthcare provider before taking Viagra or any erectile dysfunction medication if you have heart disease.

  • Get a full assessment: Your doctor can identify the underlying cause of ED and recommend safe and effective treatments tailored to your needs.

Protecting your heart health is essential—never take ED medications without medical advice if you have heart problems.

If you’ve had a heart attack, it’s important to consult a doctor or healthcare provider before taking Viagra (sildenafil).

  • Why? After a heart attack, your body may still be recovering, and taking Viagra could lead to serious side effects, including potentially dangerous drops in blood pressure.
  • Individual assessment: Your doctor will evaluate your overall heart health and medications to determine if Viagra is safe for you or recommend alternative treatments.

Always seek professional medical advice to ensure any medication you take is suitable for your condition and won’t pose additional risks.

What is in Viagra?

Viagra contains several ingredients, with sildenafil citrate as its active ingredient. This is the component that helps treat erectile dysfunction by increasing blood flow to the penis.


Ingredients in Viagra

Tablet Core (the inside of the pill):
  • Microcrystalline cellulose
  • Calcium hydrogen phosphate (anhydrous)
  • Croscarmellose sodium
  • Magnesium stearate
Film Coating (the outer layer of the pill):
  • Hypromellose
  • Titanium dioxide (E171)
  • Lactose monohydrate
  • Triacetin
  • Indigo
  • Carmine aluminium lake (E132)

These ingredients work together to form the tablet and make it safe and effective for use. Always check the patient information leaflet to ensure you’re not allergic to any of these components. If you have concerns or allergies, speak to your doctor or pharmacist before taking Viagra.

Can I drink grapefruit juice when using Viagra?

No, you should avoid drinking grapefruit juice when taking Viagra (sildenafil) for erectile dysfunction.

Why?

Grapefruit juice can interact with sildenafil, causing higher levels of the medication to build up in your blood. This can increase the risk of side effects, such as:

  • Low blood pressure
  • Headaches
  • Flushing

For your safety, stick to water or non-interacting beverages when taking Viagra. If you have concerns, consult your doctor or pharmacist for guidance.

Can I take Viagra and alcohol at the same time?

It’s best to avoid or limit alcohol consumption when taking Viagra (sildenafil).

Why?

Alcohol can interact with Viagra by lowering your blood pressure, which increases the likelihood of side effects, including:

  • Lightheadedness
  • Dizziness
  • Flushing
  • Fainting
  • Heart palpitations
  • Headaches

To stay safe and maximise Viagra’s effectiveness, stick to minimal or no alcohol when using the medication. If you have questions or concerns, consult your doctor or pharmacist for personalised advice.

Is Viagra dangerous?

For most people, Viagra (sildenafil) is a safe and effective treatment for erectile dysfunction or pulmonary hypertension. However, some individuals may need to take extra precautions.

Key points to consider:

  • Mild side effects: Most people experience little to no side effects when taking Viagra.
  • Dangerous interactions: If you are taking medicines called nitrates (often used for chest pain), Viagra can interact with these medications and cause a serious drop in blood pressure.

How to stay safe

  • Always speak to your doctor before starting Viagra to ensure it’s suitable for your individual health circumstances.
  • Avoid taking Viagra with nitrates or other medications that may interact with sildenafil.

By consulting a healthcare professional, you can ensure Viagra is both safe and effective for your needs.

Is it ok for women to take Viagra?

Viagra (sildenafil) is not recommended for women to treat sexual problems, as there is no strong evidence to suggest it is effective for this purpose.

When could Sildenafil be prescribed for a woman?

Sildenafil may be prescribed to women for pulmonary hypertension, a condition involving high blood pressure in the lungs.

If you are a woman considering Viagra or have questions about its safety, it’s essential to consult your doctor or healthcare provider. They can provide guidance and recommend treatments suitable for your specific needs.

For more information, visit trusted health resources like the NHS website.

Can I split Viagra tablets?

Yes, Viagra tablets can be cut in half, crushed, or swallowed whole, depending on the dosage prescribed to you.

Why split a tablet?

  • Splitting can help adjust your dose if directed by your doctor.
  • It may also save costs if your healthcare provider recommends it.

Important considerations

  • Only split tablets if your doctor or pharmacist confirms it’s safe.
  • Use a pill cutter to ensure even doses.
  • Always follow the instructions provided with your medication to ensure effectiveness and safety.

If you’re unsure, speak to your doctor or pharmacist for guidance.

Can you yell if a man has taken Viagra?

No, there are no medical tests that can prove if someone has taken Viagra. However, if your partner knows about your past erectile issues, they might notice changes, such as improved erections.

Taking Viagra is nothing to be ashamed of. Talking openly with your partner about your decision to use erectile dysfunction medication can strengthen trust and support. Remember, sexual stimulation is needed for Viagra to work effectively.

If you have concerns, speak to your doctor or healthcare provider for personalised advice.

Can teenagers take Viagra?

Teenagers aged 18 or older may be prescribed sildenafil (generic Viagra) to treat erectile dysfunction, but only if approved by a doctor.

For younger patients:

Sildenafil can also be prescribed on the NHS to children over the age of 1 for the treatment of pulmonary hypertension (a type of high blood pressure affecting the lungs).


Important Considerations

  • Always consult a doctor: Sildenafil should only be used under medical supervision to ensure it is safe and suitable for the individual’s needs.
  • Not for recreational use: Viagra should only be taken for medical conditions like erectile dysfunction or pulmonary hypertension, as directed by a healthcare provider.

For personalised advice, speak to your doctor or pharmacist.

Does Viagra increase testosterone?

The relationship between Viagra (sildenafil) and testosterone levels is still unclear, as studies show mixed results.

  • Some studies suggest: Taking sildenafil may lead to a slight increase in testosterone levels. (Spitzer et al., 2013 and Reuters, 2012).
  • Other studies indicate: Low testosterone levels might make Viagra less effective for treating erectile dysfunction (BBC, 2010).

Remember:

  • Viagra is primarily designed to improve blood flow to the penis and treat erectile dysfunction, not to increase testosterone.
  • If you suspect low testosterone levels, consult your doctor. They can perform tests and recommend the most appropriate treatment for your condition.

Always follow professional medical advice when using Viagra or addressing hormonal concerns.

Will Viagra affect my fertility?

According to the NHS, there is no strong evidence to suggest that Viagra (sildenafil) impacts fertility in men or women.

In fact, Viagra may help if you’re trying for a baby and need support with getting and maintaining an erection during sex.

If you’re concerned about fertility or using Viagra, speak to your doctor for personalised advice.

Alternative Erectile Dysfunction Treatments

If Viagra isn’t suitable for you, or you’re looking for a longer-lasting solution, there are several alternatives available, including prescription medications, over-the-counter treatments, lifestyle changes, and natural remedies.


Affordable and Over-the-Counter Options

  • Sildenafil: The generic version of Viagra. It contains the same active ingredient, works the same way, and is usually more affordable. Both generic and branded are available to buy at UK Meds.
  • Viagra Connect: An over-the-counter version of Viagra available for men over 18 without a prescription.
  • Cialis Together: A non-prescription option offering longer-lasting effects.
  • Penis Pumps: Medical devices like the Vaxaid V30 vacuum pump, which promote blood flow to the penis and can be used with or without medications.

Prescription Alternatives to Viagra

If Viagra doesn’t work for you, or if you need a different treatment, consider:

  1. Cialis (tadalafil): A long-lasting medication effective for up to 36 hours.
  2. Cialis Daily: Taken daily, so you’re always prepared.
  3. Spedra (avanafil): Works in as little as 15 minutes, one of the fastest options.
  4. Levitra (vardenafil): Reliable and effective for up to 69% of men.
  5. Vitaros (alprostadil cream): A topical treatment applied directly to the penis, working within 5 minutes.

Check out our Google Web Story explaining the difference between Viagra, Viagra Connect and sildenafil:


Lifestyle Changes for ED

Improving your overall health can help alleviate erectile dysfunction symptoms. Your doctor may recommend:

  • Exercising regularly and maintaining a healthy weight.
  • Eating a balanced diet and reducing alcohol consumption.
  • Stopping smoking, which can improve blood flow and overall health.

These changes can also help address underlying physical conditions like high cholesterol or cardiovascular disease that may be causing ED.


Counselling and Psychological Support

If your ED is related to psychological factors such as stress, anxiety, or low libido, your doctor may recommend counselling therapy. This approach helps address the mental and emotional issues contributing to your condition.


Natural and Alternative Approaches

  • Pelvic floor exercises: Strengthen the muscles involved in erections and improve function.
  • Healthy habits: Lifestyle adjustments like quitting smoking, healthy eating and limiting alcohol can enhance sexual health.

Learn more with UK Meds support resources for Viagra:

Author

Content author

Scott Weaver

Medical Content Writer • Bachelor of Arts Degree

Scott is an experienced, skilled content writer dedicated to creating helpful and accessible medical content for UK Meds.

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Medical Reviewer

Medical Reviewer

Alexis Missick

General Practitioner (GP) • MBChB

With a decade of experience in the NHS and six years internationally, Alexis is a seasoned General Practitioner hailing from Turks and Caicos.

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