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Sildenafil Tablets (25mg, 50mg,100mg)

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  • Medication features

    Generic Erectile Dysfunction (ED) treatment

    Sildenafil tablets are a prescription-only medicationoption for adult men with erectile dysfunction, and each sildenafil tablet is taken on-demand (not as a daily medicine).


    Most men take Sildenafil tablets around 30 to 60 minutes before sex. The effects typically last for around 4 hours, and the medication only works when you are sexually aroused.

    • Most men (about 69%) see positive results.
    • Same results as branded Viagra, at a lower cost.
    • Available in 25mg, 50mg, and 100mg strengths, with a choice of pack sizes.
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Overview

If you require a particular manufacturer of Sildenafil, please contact us after placing your order.

NOTE: After selecting this product, you will need to complete a short assessment, so we can make sure this medication is suitable for you.

  • Sildenafil Film-coated Tablets (25mg, 50mg, 100mg)

    Sildenafil film-coated tablets (commonly known by the brand name Viagra) are prescribed to treat erectile dysfunction (the inability to achieve or maintain an erection sufficient for sexual activity) in men.

    Sildenafil tablets contain the active ingredient sildenafil citrate, which works in the same way as branded Viagra tabletstablers, but usually more affordable.

    This medication comes in 25mg, 50mg, and 100mg film-coated oral tablets. In the UK, it’s only available in tablet form, not as a gel or liquid, and is sold in packs of 4, 8, 16, 32, or 64 tablets.


    Sildenafil tablets are only for men with erection problems (ED) and must be prescribed by one of our accredited online prescribers.

    If you don't have erection problems, you should not take Sildenafil tablets, as they are NOT recommended for men without this condition. This medicine is also NOT intended for females.

  • How Do Sildenafil Tablets Treat Erectile Dysfunction?

    Sildenafil belongs to a group of medicines called phosphodiesterase type 5 (PDE-5) inhibitors, which work by increasing blood flow. During sexual arousal, your body increases a chemical messenger (cGMP) that helps blood vessels in the penis relax, so more blood can flow in and an erection can form.


    In some men, the PDE-5 enzyme breaks down cGMP too quickly. Sildenafil tablets help by blocking PDE-5, allowing cGMP to remain active for longer and improving blood flow to support a firmer erection.

     

    Important key points:
    • Only works if you are sexually aroused or stimulated– it won't give you an erection randomly.
      It takes about 30-60 mins to kick in.
    • Lasts approximately 4 hours (but you may not have an erection the whole time).
    • Available on NHS (if prescribed) or privately from pharmacies like Ashcroft Pharmacy.
  • Do Sildenafil Tablets Really Work?

    Yes, they do. Many studies confirm that sildenafil helps improve the ability to get and maintain an erection for successful intercourse.


    Sildenafil tablets significantly improves the ability to achieve and maintain an erection suitable for sex, with response rates ranging from 60% to over 80%, depending on dosage, health condition, and trial specifics.

     

    When do Sildenafil tablets start working?

    Sildenafil usually starts to work within about 30 to 60 minutes. For best results, take it with water and avoid heavy meals close to taking your dose.


    How long does it last?

    For most men, effects last around 4 hours, although this varies from person to person.

    Am I eligible for Sildenafil film-coated tablets?

    You're generally eligible for sildenafil film-coated tablets, as long as our licensed pharmacist approves it after reviewing your online assessment and you meet the following criteria:

    • Age: You are 18 or over.
    • Male: You are male (assigned male at birth).
    • Experience: You’ve had trouble getting or keeping an erection firm enough for sex.
    • Diagnosis: You’ve been diagnosed with erectile dysfunction by a GP or other healthcare professional.

    If you already have a prescription:

    You can upload it during the checkout process, and our pharmacist will verify it before dispensing your medication.

    If you don't have a prescription:

    No problem, just complete our secure online consultation. One of our UK-registered prescribers will review your answers and, if suitable, issue a private prescription as part of your order.

    Important Note for Your Safety:

    Even if you meet the above general criteria, sildenafil is NOT suitable for all men, especially those with severe heart conditions or a history of stroke.

    Certain medicines, especially nitrates used to treat angina and heart disease, can dangerously interact with sildenafil. Do NOT take sildenafil with nitrates (medications for chest pain), as this can cause a dangerous drop in blood pressure.

    Before buying sildenafil online:

    It's recommended to have a face-to-face appointment with your GP. However, many people choose the convenience of an online consultation, like what we offer here on the online Ashcroft Pharmacy. 

    Suitability for treatment is checked during our online consultation.

  • When Not to Take Sildenafil Tablets

    Do Not Take Sildenafil Tablets If You:

    • Have had allergic reactions or side effects from previous ED treatments.
    • Have had a recent heart attack or stroke (within the last six weeks), or suffer from serious heart conditions such as heart failure or unstable angina (chest pain at rest).
    • Have ever used a spray under the tongue for chest pain.
    • Have low blood pressure or uncontrolled high blood pressure.
    • Have liver or kidney disease.
    • Have active stomach ulcers (such as a peptic or gastric ulcer).
    • Have certain blood or bleeding disorders or cancers, such as sickle cell anaemia, haemophilia, multiple myeloma, or leukemia.
    • Have anatomical deformities of the penis, including Peyronie’s disease or a significant bend when erect.
    • Have serious eye conditions or a family history of eye diseases, such as retinitis pigmentosa or non-arteritic anterior ischemic optic neuropathy (NAION).
    • Are using recreational drugs known as "poppers" (alkyl nitrites).
    • Are allergic to sildenafil or any of its ingredients.

    Medicine Interactions:

    Sildenafil can interact with certain medications. Always inform your doctor of all medicines you are taking to avoid harmful effects.

  • Resources

Directions

Directions for Taking Sildenafil Tablets
How Should I Use Sildenafil Tablets (25mg, 50mg, 100mg)

Sildenafil film-coated oral tablets come in 25mg, 50mg, and 100mg strengths. They are prescription-only (POM) and should always be taken exactly as advised by your GP or prescriber.

Be sure to read the Patient Information Leaflet that comes with your medication before use.

How to Take Sildenafil Tablets
  • Swallow one tablet whole with water.
  • Take it around 30 to 60 minutes before sex.
  • Demonstrates best results when you are sexually aroused.
  • Do not take more than one dose in 24 hours.
  • Do not exceed 100mg in 24 hours.

Sildenafil is taken as needed, about an hour before sex, and doesn't need to be used daily.

Avoid taking Sildenafil tablets with a heavy meal or alcohol, as both can reduce its effectiveness.

Never mix it with heart medications like nitrates; doing so can lead to a dangerous drop in blood pressure.

 
CRITICAL SAFETY WARNING

NEVER take sildenafil if you are using any form of nitrate medication (e.g., nitroglycerin for chest pain) or recreational "poppers" (amyl nitrite). This combination can cause a sudden, severe, and potentially fatal drop in blood pressure.

Dosage

Sildenafil dosage

Sildenafil film-coated tablets are prescribed in 25 mg, 50 mg, and 100 mg doses for erectile dysfunction. For most patients, effective results are usually seen with doses between 50 and 100 mg. For a detailed comparison, see our guide on sildenafil 50mg vs 100mg.

25 mg
The lowest dose, used to minimize side effects or for specific patient groups.
50 mg
The standard starting dose for most men, offering a good balance of efficacy and tolerability.
100 mg
The maximum dose, for men who need a stronger effect and did not respond to 50mg.

The right sildenafil dose depends on your health and response to treatment. It should not be taken more than once per day, with a maximum recommended dose of 100mg within 24 hours.

Good to know

A doctor may prescribe 100mg for men with more severe erectile dysfunction (e.g. trouble maintaining an erection) or for those who haven’t had success with 25mg or 50mg doses. However, higher doses also come with a greater chance of side effects, so they should only be taken under medical supervision.

When is a Lower Starting Dose (Sildenafil 25mg) Required?


Over Age 65
Rationale: Reduced drug clearance in the body can lead to higher medication levels.

Severe Kidney Issues
Reason: Impaired kidney function slows the removal of the drug from the body.
Liver Impairme

Liver Impairment
Rationale: The liver is the primary site of metabolism; impairment leads to higher drug levels.

Taking Alpha-Blockers
Rationale: Both can lower blood pressure, so a lower starting dose minimizes the risk of dizziness or fainting.

Taking CYP3A4 Inhibitors
Rationale: These drugs (e.g., certain antifungals, antibiotics, HIV meds) block the enzyme that breaks down sildenafil, leading to dangerously high levels.
 

 

Warnings

Important Medicine & Substance Interactions:

Sildenafil can interact with many medications and substances. Always inform our doctor in your online assessment of ALL medicines, supplements, and recreational drugs you are taking. Key interactions include:

  • Alpha-blockers (for high blood pressure or prostate issues)
  • Certain antifungals, HIV protease inhibitors, some antibiotics.
  • Grapefruit or grapefruit juice (can increase sildenafil levels).
  • Alcohol (can worsen side effects like dizziness and lower blood pressure).

For full prescribing details, visit the official Pfizer product page or
See the patient information leaflet provided by Pfizer Inc.

FAQ

  • Which Sildenafil Strength is Recommended for a First-time User?

    For many men, 50mg is a typical starting point. In some cases, 25mg may be recommended based on age, medical history, or other medicines. Your prescriber will advise what is most appropriate for you.

  • Is Sildenafil As Good as Viagra?

    Yes. Generic sildenafil contains the same active ingredient as branded Viagra and works in the same way. The main difference is usually price and branding.

  • How Often Can I Take Sildenafil 100mg?

    Do not take more than one dose in 24 hours. Do not exceed 100mg in 24 hours. If 100mg has not worked, do not increase the dose yourself. Speak to a prescriber for advice.

  • Can Women Take Sildenafil?

    This treatment is for erectile dysfunction treatment in men. Sildenafil is not suitable for women for this purpose unless specifically prescribed for another medical reason by a clinician.

  • Can I Take 2 Sildenafil Tablets At Once?

    Do not take more than one dose at a time. Taking more than prescribed increases the risk of side effects and does not necessarily improve results.

  • Can I Take Two 25mg Tablets Together If the Maximum Dosage Is 100mg?

    Only take Sildenafil exactly as prescribed. Even if two 25mg tablets equal 50mg, your prescriber may have recommended 25mg for a specific reason. If you feel your dose is not effective, speak to a prescriber rather than increasing it yourself.

  • Can Tadalafil/Cialis Daily and Sildenafil/Viagra Be Taken Together?

    No. Taking more than one ED treatment together is not advised, as it can increase side effects and risks.

  • How Can I Naturally Address Erectile Dysfunction (ED)?

    Lifestyle changes can help in some cases, such as reducing alcohol, stopping smoking, managing stress, improving sleep, and addressing underlying health issues (for example, high blood pressure or diabetes). Speak to a healthcare professional for personalised advice.

  • How Can I Get the Best Results From Sildenafil?

    Take Sildenafil as directed, allow enough time before sex, avoid heavy meals close to taking your dose, and keep alcohol intake low. Remember it needs sexual stimulation to work.

  • Should I Choose Branded Viagra or a Generic Version?

    Both contain sildenafil and work in the same way. Generic sildenafil is usually the more cost-effective option. Choose what suits your preference and budget, and follow prescriber guidance.

  • Is It Safe To Take 100mg of Sildenafil?

    100mg can be safe if it is prescribed and clinically appropriate. It is the maximum recommended dose within 24 hours. Never exceed 100mg in 24 hours.

  • What Happens If I Take 200mg of Sildenafil?

    200mg is not recommended and can be dangerous. If you have taken too much and feel unwell, seek urgent medical advice. If you have severe symptoms such as chest pain, fainting, or a prolonged erection (over 4 hours), seek emergency help immediately.

  • Does 100mg of Sildenafil last longer than 50mg or 25mg?

    Not usually. Duration is broadly similar across doses for most men (often around 4 hours). A higher dose may feel more effective for some people, but it does not reliably extend duration.

Side Effects

Sildenafil oral tablets side effects: From common to serious

Most men can take Sildenafil without any side effects. The common ones, affecting about 10% of men, include headache, flushing, dizziness, stuffy nose, nausea, hot flush, indigestion, and temporary vision changes like blurriness or a tint.

Tips: Drinking water and avoiding alcohol can help reduce Sildenafil's side effects. You can read our Full Guide on "How to Manage Sildenafil Side Effects"

Common Side Effects (>1 in 100 people)

Headache, Flushing, Dizziness:
Caused by vasodilation. Usually mild and temporary. Rest, hydrate, and rise slowly.

Indigestion (Dyspepsia): Can be eased with antacids or by taking the pill with a light meal.

Nasal Congestion: A stuffy nose due to widened blood vessels in nasal passages.

Visual Disturbances: Blurred vision or a blue tinge. Usually resolves on its own. Avoid driving if affected.

Less Common Side Effects (1 in 100 to 1 in 1,000)

Back/Muscle Pain: Rest may help. Contact your doctor if it is bothersome. Nausea, Skin Rash: Generally mild effects.

Rare but Serious Side Effects (<1 in 1,000)

Prolonged Erection (Priapism): 

MEDICAL EMERGENCY. An erection lasting >4 hours. Can cause permanent damage. Go to A&E immediately.
 Sudden Vision or Hearing Loss:

MEDICAL EMERGENCY. Stop taking sildenafil and seek immediate medical help.
 Chest Pain:

MEDICAL EMERGENCY. Especially during or after sex. Stop activity and call emergency services. DO NOT take nitrates.
Severe Allergic Reaction:

MEDICAL EMERGENCY. Swelling of face/throat, difficulty breathing. Go to A&E immediately.
Shortness of breath

Stop taking sildenafil and go to A&E straight away.

See the Sildenafil package leaflet for full details and safety information.

Ingredients

Sildenafil film-coated tablets Ingredient

Active Ingredient:
Sildenafil citrate

Drug Class (Main):
PDE5 Inhibitor (Phosphodiesterase type 5 inhibitor)

Used For:
Erectile Dysfunction (ED)
Pulmonary Arterial Hypertension (PAH)

Always refer to the specific Patient Information Leaflet (PIL) for the formulation you're using.

 

Delivery

Once your order has been approved by our UK medical team it will be dispatched via Royal mail. All orders are sent using a tracked and signed for service.


Royal Mail 48 (2-5 days) | £2.49

Estimated delivery within 2-3 working days. Excludes bank holidays. Not a guaranteed service.

Free standard delivery on orders over £45.

Royal Mail 24 (1-2 days) | £2.95

Estimated delivery within 1 working day. Excludes bank holidays. Not a guaranteed service.

Royal Mail Special Delivery Guaranteed by 1pm | £6.99

Order by the 2:00 PM weekday cut-off time for guaranteed delivery by 1:00 PM the next business day.

Orders placed after the cut-off on Friday will be delivered on Tuesday.

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Written and reviewed by our qualified team

Authored by:

Mr Suhail Jamil

|

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GPhC Number: 2069518

Order Monday to Friday before 14:00pm to guarantee next day delivery