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Sildenafil Tablets (Generic Viagra)

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What is Sildenafil?

Sildenafil (generic Viagra), is one of the most commonly used erectile dysfunction treatments.

When taken 30-60 minutes before sexual activity, it increases blood flow to the penis, helping men achieve and maintain an erection during sexual activity.

The branded version, Viagra, was approved by the European Medicines Agency (EMA) in September 1998. Both the branded and generic versions are prescription-only medications that require approval from a licensed healthcare professional.

At euroClinix, we prescribe Sildenafil specifically to treat erectile dysfunction. The treatment is available in 25 mg, 50 mg, and 100 mg strength tablets.

Is Sildenafil the same as Viagra?

While they may look slightly different, these treatments are medically equivalent, meaning they produce the same effect.

The main difference between Viagra and Sildenafil is the price. Once Pfizer’s patent ran out, other pharmaceutical companies were able to make generic versions of the drug. Despite being essentially the same, generic drugs are often far cheaper since they do not require the same research and development costs associated with the original branded version.

How does Sildenafil work?

The active ingredient, sildenafil citrate, works by increasing blood flow to your penis, making it easier to get and maintain an erection.

Contrary to popular belief, Sildenafil only works when the person taking it is sexually stimulated. This means it is unlikely to give you an erection if you are not engaging in some form of sexual activity.

When you’re sexually aroused, your body relaxes blood vessels so more blood can flow to the penis. Sildenafil supports this process by blocking an enzyme called PDE5 from restricting blood flow.

By directly targeting this enzyme, Sildenafil keeps the blood vessels open and relaxed, allowing men with erectile dysfunction to achieve and maintain an erection.

What are the benefits of Sildenafil?

Taking this medication for erectile dysfunction offers many health benefits:

Key benefits of Sildenafil

Fast onset of action

effective within 30-60 minutes, allowing use on short notice.

Long duration

the effects can last up to 4 hours.

Affordable

generic Sildenafil is more affordable than branded Viagra and just as effective.

Varied dosage strengths

sildenafil tablets are available in 25 mg, 50 mg, or 100 mg dosage strengths to suit individual needs.

Convenient dosing

this treatment is only taken when needed, making it a hassle-free option to treat your condition.

Non-invasive treatment option

oral treatments are less invasive than alternative treatments, like injections or penile implants.

How effective is Sildenafil?

Sildenafil has been proven in clinical studies to be a highly effective treatment for erectile dysfunction.

One study conducted over 24 weeks determined the effectiveness of this treatment at different dosages. Here are the key findings:

Sildenafil study results

24-week study of 532 men reporting improved erections

100mg

84% of men

50mg

77% of men

25mg

56% of men

Placebo

25% of men

Study Duration

24 weeks

Participants

532 men

Who can and cannot take Sildenafil?

This medication may not be suitable for everyone. When you complete a consultation, our UK-registered doctors will be able to determine if Serevent is safe for you.

Who can take it?

This medication is suitable for men over 18 experiencing erectile dysfunction.

Who cannot take it?

You cannot take this medicine if any of the following health conditions apply to you:

  • You are allergic to sildenafil citrate or any other ingredient found in this medication
  • You have a severe heart or liver problem
  • You have recently had a stroke or heart attack
  • You have low blood pressure
  • You have certain rare inherited eye diseases (e.g. retinitis pigmentosa)
  • Ever had loss of vision due to stroke of the eye (non-arteritic anterior ischaemic optic neuropathy)

Cautions

In addition, there are some instances where the safety of this medicine will need to be determined in your consultation. Tell one of our doctors if any of the following applies to you:

  • You have sickle cell anaemia (an abnormality of red blood cells)
  • You have leukemia (cancer of the blood cells) or multiple myeloma (cancer of the bone marrow)
  • You have heart problems
  • You have a deformity of the penis or Peyronie’s Disease
  • You currently have a stomach ulcer

Please disclose your health status during your online consultation with euroClinix. Our doctor will evaluate whether Sildenafil is suitable for you and may adjust your medications if needed.

How do I take Sildenafil?

To use this medicine correctly, follow the dosage and treatment course our medical team prescribes. This ensures the drug's effectiveness and helps avoid side effects.

For best results, take your tablets:

  • With a glass of water
  • On an empty stomach

Taking sildenafil after a heavy meal may delay its absorption and reduce its effectiveness. For the best results, I recommend taking your tablet on an empty stomach.

Dr. Caroline Fontana Lead Prescribing Doctor

Dosage

Three dosages are available for your erectile dysfunction tablets: 25 mg, 50 mg, and 100 mg.

The recommended starting dose of Sildenafil (generic Viagra) is 50 mg, but your doctor may prescribe you less or more depending on your individual circumstances.

How much Sildenafil is too much?

The maximum daily dosage of Sildenafil is 100 mg. Always follow your doctor's instructions when taking your medicine and never take it more than once per day.

When do I take it?

You should take your tablet 30-60 minutes before sexual activity.

It only needs to be taken before sexual activity. You do not need to take it every day, and you should not use it more than once a day.

How long does Sildenafil take to work?

It usually takes up to an hour for the medicine to have an effect on your erection.

The effects of Sildenafil can last for up to 4 hours.

What lifestyle changes should I make while taking Sildenafil?

While the medicine is proven to work on its own, you can make certain lifestyle changes to help treat your condition more effectively.

Lifestyle guide for Sildenafil users

Maintain a healthy weight

Maintaining a healthy weight can improve sexual function and make Sildenafil more effective by reducing your risk of developing cardiovascular problems.

Stop smoking

Smoking can damage blood vessels, making you around twice as likely to experience erectile dysfunction. Consider quitting to improve sexual function.

Limit alcohol intake

Alcohol affects the nervous system, which can make it harder to get and maintain an erection. Try to limit your alcohol intake for better sexual performance, and avoid it altogether when you plan to have sex.

Maintain regular exercise

Regular physical activity improves cardiovascular health, boosts circulation, and can make Sildenafil more effective. Aim for 150 minutes of moderate exercise per week if you are able.

Manage stress

Stress can increase cortisol levels, which is responsible for lowering testosterone. Practice stress-reducing techniques like meditation, yoga, and deep breathing if you feel overly stressed.

Always consult with your healthcare provider before making significant lifestyle changes.


A balanced diet rich in fruits, vegetables, lean protein, and whole grains supports vascular health and may improve erectile function. Foods like spinach, salmon, walnuts, and dark chocolate are particularly beneficial due to their nutrients that boost circulation and nitric oxide levels

Silvia Fonda Nutritionist

What are Sildenafil’s side effects?

This medication may produce side effects. These are usually mild and should go away in a few days.

Consult your doctor if side effects persist or are unmanageable.

Very common side effect (may affect more than 1 in 10 people)
  • Headache
Common side effects (may affect up to 1 in 10 people)
  • Digestive issues: nausea, indigestion
  • Circulatory symptoms: hot flushes (red and hot skin)
  • Vision changes: changes in vision
  • Other symptoms: stuffy nose, dizziness
Uncommon side effects (may affect up to 1 in 100 people)
  • Digestive issues: vomiting, upper abdominal pain, gastro-oesophageal reflux disease (GORD)
  • Vision changes: eye irritation, bloodshot eyes, flashes of light, light sensitivity, watery eyes
  • Other symptoms: chest pain, sleepiness, vertigo, ringing ears, dry mouth, blocked or stuffy sinuses, blood in urine, leg or arm pain, nosebleeds
  • Skin and muscle symptoms: skin rash, muscle pain
  • Circulatory symptoms: pounding heartbeat, high or low blood pressure
Rare side effects (may affect up to 1 in 1,000 people)
  • Serious circulatory events: fainting, stroke, heart attack, irregular heartbeat, temporary decreased blood flow to parts of the brain, prolonged and painful erections, seizures or fits
  • Vision changes: bleeding at the back of the eye, double vision, reduced sharpness of vision, abnormal sensations in the eyes or eyelids
  • Serious skin reactions: peeling and swelling of the skin, skin blistering, fever
  • Other symptoms: tightening of the throat, numb mouth

How to manage side effects

Managing Side Effects of Sildenafil
Headache Common
  • Drink plenty of water
  • Limit alcohol intake
  • Usually subsides after one week as body adjusts
Chest Pain uncommon
  • DO NOT use nitrates
  • Get into a semi-sitting position
  • Try to relax
  • If pain persists, seek medical attention
Prolonged Erection Emergency
  • Seek immediate medical help if erection lasts longer than 4 hours
  • May be painful
  • This condition requires urgent medical attention

If you experience mild side effects like headache or flushing, staying hydrated and resting can help. For more severe symptoms, such as chest pain or severe skin reactions, stop using sildenafil and seek medical advice immediately.

Dr. Caroline Fontana Lead Prescribing Doctor

What interacts with Sildenafil?

Some medicines may increase the risk of side effects or reduce the effectiveness of this treatment. Tell your doctor about any medication you take, including the following:

  • Certain antibiotics and antifungals (e.g., erythromycin, ketoconazole) - can make sildenafil stay in your body longer, increasing side effects.
  • Medications that speed up drug breakdown (e.g., rifampin, bosentan) - can lower sildenafil levels, making it less effective.
  • Heart medications (e.g., nitroglycerin, nicorandil) - can cause a dangerous drop in blood pressure.
  • Prostate medications (e.g., doxazosin) - can cause dizziness or fainting when combined with sildenafil.
  • HIV medications (e.g., ritonavir, saquinavir) - greatly increase sildenafil levels; you may need a much lower dose.
  • Blood pressure medications (e.g., amlodipine) - may lower your blood pressure more when taken with sildenafil.
  • Pulmonary hypertension medications (e.g., riociguat) - may significantly lower blood pressure.
  • Amyl nitrate (“poppers”) - can drop blood pressure to dangerously low levels.
  • Grapefruit juice - can increase sildenafil levels slightly, so avoid large amounts.

This list does not cover all possible interactions. For a comprehensive list, please visit the interactions checker on the BNF website.

What safety advice should be followed when taking Sildenafil?

Category Safety Advice
Alcohol Caution Alcohol can temporarily impair your ability to get and maintain an erection. Limit your alcohol intake before sexual activity.
Lactose Consult your doctor This medicine contains lactose. Consult your doctor before use if you have been told you are lactose intolerant.
Driving Caution This medicine can cause dizziness and affect your vision. You should be aware of how you react to this drug before driving or operating machinery.
Hydration Important Proper hydration can positively affect blood circulation, possibly improving the drug’s effectiveness and reducing the risk of side effects.

How should I store Sildenafil?

This medication does not require any special storage instructions. To safely store your tablets, follow these general guidelines:

  • Do not use this medicine after the expiry date
  • Keep this medicine out of the sight and reach of children
  • Do not throw away medicines via wastewater or household waste.*

*Take any unused medication to your local pharmacy for proper disposal. These measures help to protect the environment.

Can I buy Sildenafil without a prescription?

No, Sildenafil can only be obtained with a prescription from a licensed healthcare provider.

Prescriptions are necessary because they:

  • Ensure appropriate use for your specific condition.
  • Prevent potential misuse and associated health risks.
  • Allow for monitoring of side effects and interactions with other medications.

Viagra Connect is an over-the-counter alternative to Sildenafil, however, it is only available as 50 mg tablets.

How do I buy Sildenafil online from euroClinix?

Ordering Sildenafil online from euroClinix is convenient.

Follow these simple steps:

  1. Complete a quick online consultation to check your eligibility.
  2. UK-registered doctors review your responses to ensure the medication is right for you.
  3. Upon approval, an e-prescription will be issued.
  4. Enjoy free delivery from our licensed pharmacy with tracking details.

Your privacy is our top priority. euroClinix uses secure, encrypted transactions and complies with UK medical standards to keep your information confidential.

Start your online consultation today to enjoy professional care from the comfort of your home.

Why should I choose euroClinix?

euroClinix is trusted by thousands of users in the UK for its safe and convenient service. Here’s why:

  • Experienced doctors manage your consultations and prescriptions.
  • Online consultations, swift approvals, and discreet doorstep delivery make ordering quick and convenient.
  • A supportive team is on hand to answer treatment-related questions or concerns.
  • Patients can manage their prescriptions hassle-free through our secure platform.

Join thousands who trust euroClinix for their healthcare needs and take control of your health today.

How much does Sildenafil cost?

The price of Sildenafil at euroClinix includes everything you need:

  • Free online consultation with our experienced doctors
  • Free prescription, if approved
  • Free delivery straight to your door

Our pricing is transparent, with no hidden fees. Order today and benefit from our complete, all-inclusive service.

What alternatives are available?

If this treatment is not right for you, there are other erectile dysfunction tablets available to treat your condition.

Medication Key features Time to work Effect duration Price range
Sildenafil Same as Viagra, lower price 30-60 minutes Up to 4 hours -
Viagra Most well-known and studied 30-60 minutes Up to 4 hours -
Cialis Longest-lasting effects, the “weekend pill” 30-60 minutes Up to 36 hours -
Tadalafil Same as Cialis, lower price 30-60 minutes Up to 36 hours -
Cialis Daily Taken daily, ongoing effects 3-5 days of daily use Continuous -
Vardenafil Highly tolerable for most people 30-60 minutes Up to 5 hours -
Spedra Fastest-acting 15-30 minutes Up to 5 hours -
ED trial pack Includes Sildenafil, Tadalafil, and Vardenafil Varies per medication Varies per medication -

When to take Typical dose Efficacy Ideal for
Sildenafil 1 hour before sex 50 mg Up to 84% effective Reliable treatment at a lower price
Viagra 1 hour before sex 50 mg Up to 84% effective A trustworthy and popular treatment
Cialis 30-60 minutes before sex 10 mg Up to 64% effective Long-lasting treatment
Tadalafil 30-60 minutes before sex 10 mg Up to 64% effective Long-lasting treatment at a low price
Cialis Daily At the same time each day 5 mg Up to 96% effective Daily dosing and ongoing effects
Vardenafil 25-60 minutes before sex 10 mg Up to 80% effective Those not suited to other treatments
Spedra 15-30 minutes before sex 100 mg Up to 85% effective Fast-acting treatment
ED trial pack Varies Varies Efficacy varies Exploring multiple treatment options

Sildenafil FAQs

Can I take 200 mg of Sildenafil?
Can women take Sildenafil?
How long does Sildenafil stay in your system?
Is Sildenafil safe?
Does Sildenafil make you last longer?
Does Sildenafil lower blood pressure and heart rate?
Are there any discounts for being a new user?
Is it safe to order online?
Will my order be confidential?
What are the delivery options available?

Note: You must complete a short online consultation so that our doctor can ensure that the treatment is suitable for you. The above pricing should only be used as a reference. The final decision to issue this treatment lies with the prescribing doctor.

Medically reviewed by Dr. Caroline Fontana Written by our editorial team Last reviewed 10-01-2025
Sildenafil information
Type of medicine PDE5 Inhibitor
Used for Treatment of erectile dysfunction
Active ingredient(s) Sildenafil citrate
Works by Temporarily increasing blood flow to the penis when you are sexually aroused
Effective within 30-60 minutes
Available as Tablets
Available dosage(s) 25 mg, 50 mg, 100 mg
Usage instructions Take one tablet 30-60 minutes before sexual activity
Packaging Blister packs containing 4-16 tablets
Manufacturer Various
Branded available? Yes ( Viagra )
Storage Keep at room temperature in the original packaging. Protect from moisture and direct heat.
Prescription required? Yes, get it with our FREE online consultation
Who is suitable for an online consultation* Men over 18 with erectile dysfunction

*Note: Our medical team must review your online consultation before approving this treatment. They will determine if the requested treatment and quantity are safe, appropriate, and effective for you.

Sildenafil reviews
Package contains 4 Sildenafil Lekap 25mg film-coated tablets Excellent 4.4 1903 patients have reviewed Sildenafil on Trustpilot
01 Oct

Perfetto per il mio problema

Emilio
19 Jun

Super 😁 very good

czeslawa
10 Mar

The goal was to gel to a Better relationship

Antonio Ferrari

Further reading

Viagra and how it reacts with other medicines

Viagra and how it reacts with other medicines

Reviewed by Dr. Caroline Fontana
Viagra: the side effects explained

Viagra: the side effects explained

Reviewed by Dr. Caroline Fontana
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