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Sildenafil (Teva)

Sildenafil (Teva)

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  • ✔️ Treats erectile dysfunction by increasing blood flow to the penis
  • ✔️ Works within 30–60 minutes of taking a single tablet
  • ✔️ Effects last up to 4–5 hours per dose
  • ✔️ Clinically equivalent to branded Viagra at a lower cost
  • ✔️ Suitable for adult men aged 18 and over with ED

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What Is Sildenafil Teva 100mg and How Does It Help?

 

Erectile dysfunction (ED) is more common than many people realise. In fact, it affects around one in five men in the UK at some point in their lives, and the numbers increase with age. If you've been struggling to get or keep an erection firm enough for sex, you're far from alone — and there are clinically proven options available. Sildenafil teva 100mg is a licensed generic medicine containing sildenafil citrate, the same active ingredient found in Viagra. It's manufactured by Teva UK Limited, one of the world's largest generic pharmaceutical companies, and is available to buy online from Cured Pharmacy following a short clinical assessment. You can also explore our wider range of treatments in our men's health collection.

Sildenafil belongs to a class of medicines called phosphodiesterase type 5 (PDE5) inhibitors. It does not cause an erection on its own — sexual stimulation is still needed. What it does is make it significantly easier for an erection to occur and be maintained when you are aroused. It's taken as needed, rather than every day, which many men find convenient.

 

How Does Sildenafil Teva Work in the Body?

 

Understanding the mechanism helps you use this medicine correctly. When you're sexually stimulated, your body releases nitric oxide in the erectile tissue of the penis. This triggers a chain reaction that relaxes smooth muscle and widens blood vessels, allowing blood to flow in and create an erection. In men with ED, an enzyme called PDE5 breaks down the chemical signals too quickly, disrupting this process.

  • Sildenafil inhibits PDE5, preventing it from breaking down cyclic GMP (cGMP) — the chemical that relaxes blood vessel walls.
  • With PDE5 blocked, cGMP levels remain elevated during arousal.
  • Blood flow to the corpus cavernosum (erectile tissue) increases significantly.
  • The result is a firmer, more sustained erection in response to sexual stimulation.

It's worth noting that sildenafil will not work without sexual arousal. It enhances the body's natural response — it doesn't override it.

 

Who Is Sildenafil Teva Suitable For?

 

Sildenafil Teva is intended for adult men aged 18 and over who experience erectile dysfunction. It's suitable for a wide range of men, including those whose ED has a physical cause (such as diabetes or cardiovascular disease) or a psychological one (such as anxiety or stress). That said, it isn't right for everyone, and a clinical assessment is required before purchase.

  • Adult men (18+) with erectile dysfunction of any cause
  • Men who have previously used sildenafil or Viagra without adverse effects
  • Men who are not taking nitrate-based medicines (e.g. GTN spray for angina)
  • Men without severe hepatic, renal, or cardiovascular conditions that contraindicate use

If you're unsure whether this medicine is right for you, speak to your GP or one of our pharmacists before ordering.

 

How Does Sildenafil Teva Compare to Other ED Treatments?

 

Feature Sildenafil Teva 100mg Tadalafil (Generic Cialis)
Active ingredient Sildenafil citrate Tadalafil
Onset of action 30–60 minutes 30–60 minutes
Duration of effect Up to 4–5 hours Up to 36 hours
Dosing frequency As needed (max once daily) As needed or daily low dose

 

How Should Sildenafil Teva Be Stored and Who Should Avoid It?

 

Store sildenafil teva 100mg below 30°C in its original packaging, away from moisture and direct sunlight. Keep it out of the reach and sight of children. Do not use it after the expiry date printed on the pack. If you have unused tablets, return them to your local pharmacy for safe disposal — do not flush them or throw them in household waste.

Certain groups should avoid this medicine entirely. These include men taking nitrates in any form, those with a history of non-arteritic anterior ischaemic optic neuropathy (NAION), and anyone with severe hepatic impairment. If you're managing other health conditions, it's worth browsing our condoms and sexual health collection for complementary products that may support your sexual wellbeing.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Sildenafil Teva 100mg Tablets specifications
Treatment category Erectile dysfunction
Mechanism of action PDE5 inhibitor — increases penile blood flow during sexual stimulation
Effective Within 30–60 minutes of taking
Suitable for Adult men aged 18 and over
Active ingredient Sildenafil citrate 100mg
Pack sizes 4 tablets, 8 tablets
Strengths 100mg (also available as 25mg and 50mg)
UK classification Prescription-only medicine (POM) / P (pharmacy) for 50mg OTC
Drug class Phosphodiesterase type 5 (PDE5) inhibitor
Preparation Film-coated tablet
Route of administration Oral

Specifications of Sildenafil Teva 100mg Tablets

 

What Is Sildenafil Teva and What Is It Used For?

 

Sildenafil Teva contains the active ingredient sildenafil citrate and is used to treat erectile dysfunction in adult men. Erectile dysfunction is defined as the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual performance. It is a recognised medical condition with both physical and psychological causes, and it responds well to PDE5 inhibitor therapy in the majority of men. Sildenafil teva 100mg is a generic equivalent of Viagra and is licensed by the MHRA for use in the UK.

 

What Do You Need to Know Before Using Sildenafil Teva?

 

Before taking this medicine, it's essential to be aware of the following contraindications and warnings. Do not take sildenafil if any of the following apply to you:

  • You are taking nitrates in any form (e.g. isosorbide mononitrate, GTN spray) — the combination can cause a dangerous drop in blood pressure
  • You are taking riociguat or other soluble guanylate cyclase stimulators
  • You have severe hepatic (liver) impairment
  • You have recently had a stroke, heart attack, or have unstable angina
  • You have low blood pressure (hypotension) — below 90/50 mmHg
  • You have a rare inherited eye condition such as retinitis pigmentosa
  • You are allergic to sildenafil or any of the tablet's excipients

The following medicines may interact with sildenafil and require caution or dose adjustment:

  • Alpha-blockers (e.g. doxazosin, tamsulosin) — may increase risk of low blood pressure
  • HIV protease inhibitors (e.g. ritonavir, saquinavir) — increase sildenafil plasma levels significantly
  • Antifungals such as ketoconazole or itraconazole — may increase sildenafil exposure
  • CYP3A4 inhibitors including erythromycin and cimetidine
  • Other PDE5 inhibitors — do not combine

 

How Should You Use Sildenafil Teva Correctly?

 

Always use this medicine exactly as directed by your prescriber or pharmacist. The tablet should be swallowed whole with a glass of water. Taking it with a high-fat meal may delay the onset of action, so it's best taken on an empty stomach or after a light meal.

  1. Take one tablet approximately 30 to 60 minutes before planned sexual activity.
  2. Swallow the tablet whole — do not crush or chew it.
  3. Sexual stimulation is required for the medicine to work.
  4. Do not take more than one tablet in any 24-hour period.
  5. Avoid grapefruit juice on the day you take sildenafil, as it can affect how the medicine is absorbed.
Indication Age Group Dose Frequency
Erectile dysfunction Adults (18–64) 50mg (starting dose); may increase to 100mg or reduce to 25mg As needed, max once daily
Erectile dysfunction Older adults (65+) 25mg starting dose recommended As needed, max once daily
Erectile dysfunction with hepatic/renal impairment Adults 25mg starting dose As needed, max once daily

 

What Are the Possible Side Effects of Sildenafil Teva?

 

Like all medicines, sildenafil can cause side effects, although not everyone experiences them. Most side effects are mild and resolve on their own. If you experience a prolonged erection lasting more than 4 hours (priapism), seek emergency medical attention immediately, as this can cause permanent damage if left untreated.

Common side effects (may affect up to 1 in 10 people):

  • Headache
  • Flushing (warmth or redness in the face, neck, or chest)
  • Indigestion or upset stomach
  • Nasal congestion
  • Dizziness
  • Visual disturbances (blurred vision, colour tinge)

Less common side effects (may affect up to 1 in 100 people):

  • Palpitations or increased heart rate
  • Muscle aches or back pain
  • Skin rash
  • Nausea
  • Dry mouth
  • Sudden decrease or loss of vision or hearing — stop taking and seek urgent medical advice

If you're also managing other aspects of your health, our pain relief collection includes options that may help with mild headaches or muscle discomfort associated with treatment.

 

How Should You Store Sildenafil Teva?

 

  • Store below 30°C in the original blister packaging
  • Keep away from moisture and direct sunlight
  • Do not store in the bathroom or near a sink
  • Keep out of the reach and sight of children
  • Do not use after the expiry date printed on the pack
  • Return unused tablets to your pharmacist for safe disposal — do not flush or bin them

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Sildenafil Teva 100mg online in the UK?

You can buy Sildenafil Teva 100mg online from Cured Pharmacy, a GPhC-registered UK online pharmacy. You'll complete a short clinical questionnaire to confirm it's safe for you before your order is dispensed. It's a discreet, convenient way to access treatment without visiting a GP in person.

How does Sildenafil Teva work in the body?

Sildenafil Teva inhibits the enzyme PDE5, which normally breaks down cGMP — the chemical that relaxes blood vessel walls in the penis. By blocking PDE5, sildenafil allows cGMP to accumulate during sexual arousal, increasing blood flow to the erectile tissue. The result is a firmer, more sustained erection when you are sexually stimulated.

How long does Sildenafil Teva 100mg take to work?

Most men notice the effects of sildenafil within 30 to 60 minutes of taking it. The window of effectiveness typically lasts up to 4 to 5 hours, though individual responses vary. Taking it on an empty stomach or after a light meal helps it absorb more quickly.

What is the correct dose of Sildenafil Teva for erectile dysfunction?

The standard starting dose is 50mg taken as needed, approximately one hour before sexual activity. Depending on how well it works and how well you tolerate it, your doctor may adjust this to 25mg or 100mg. You should never take more than one dose in a 24-hour period.

Can I take Sildenafil Teva with alcohol?

Drinking excessive alcohol while taking sildenafil increases the risk of side effects such as dizziness, low blood pressure, and headache. Small amounts of alcohol are generally considered acceptable, but it's sensible to keep intake to a minimum on the day you take the tablet. Heavy drinking can also independently worsen erectile dysfunction.

Who should not take Sildenafil Teva tablets?

You should not take Sildenafil Teva if you are using nitrates for chest pain, have severe liver disease, have recently had a stroke or heart attack, or have very low blood pressure. Men with certain rare eye conditions such as retinitis pigmentosa should also avoid it. Always complete a clinical assessment before purchasing.

What are the most common side effects of Sildenafil Teva?

The most commonly reported side effects include headache, facial flushing, nasal congestion, indigestion, and dizziness. These are usually mild and short-lived, resolving without any treatment. If side effects are severe, persistent, or worrying, contact your pharmacist or GP promptly.

Is Sildenafil Teva the same as Viagra?

Yes — Sildenafil Teva contains exactly the same active ingredient as Viagra (sildenafil citrate) and works in precisely the same way. It is a licensed generic version that has been shown to be clinically equivalent to the branded product. The main difference is cost: generic sildenafil is typically available at a significantly lower price.

How do I manage side effects of Sildenafil Teva?

Most side effects are mild and settle on their own within a few hours. Staying well hydrated can help with headaches, and avoiding large meals or alcohol before taking the tablet may reduce indigestion and flushing. If you experience a prolonged erection lasting more than 4 hours, seek emergency medical attention immediately.

Can I take Sildenafil Teva every day?

Sildenafil Teva is designed to be taken as needed rather than as a daily medicine — you take it when you plan to have sex. You should not take more than one dose in any 24-hour period. If you feel you need daily support for erectile dysfunction, speak to your GP about whether a daily low-dose tadalafil regimen might be more appropriate for you.

What happens if I miss a dose of Sildenafil Teva?

Because sildenafil is taken as needed rather than on a fixed schedule, there is no concept of a "missed dose" in the traditional sense. Simply take it when you next plan to have sexual activity. Never double up or take two doses close together to compensate.

What are the alternatives to Sildenafil Teva for erectile dysfunction?

Other PDE5 inhibitors available in the UK include tadalafil (generic Cialis), vardenafil (Levitra), and avanafil (Spedra). Each has a slightly different duration of action and side effect profile. You can explore related products in our men's health collection, or speak to a pharmacist for personalised guidance.

How long can you keep taking Sildenafil Teva?

There is no fixed maximum duration for sildenafil use — many men take it safely for years as needed. However, it's worth reviewing your treatment periodically with your GP, particularly if your underlying health conditions change. Erectile dysfunction can sometimes improve with lifestyle changes such as weight loss, exercise, and stopping smoking.

Does Sildenafil Teva work for everyone with erectile dysfunction?

Sildenafil is effective for the majority of men with erectile dysfunction, but it does not work for everyone. Clinical studies suggest it is effective in approximately 70–80% of men. If it doesn't work the first time, it's worth trying it two or three more times before concluding it isn't suitable for you, as anxiety and other factors can affect the initial response.

What are the latest findings on sildenafil use in the UK?

Sildenafil remains one of the most widely studied and prescribed medicines for erectile dysfunction globally, with decades of safety data supporting its use. Ongoing research continues to explore potential benefits in other areas such as pulmonary arterial hypertension, where it is already licensed. For sexual health support beyond ED treatment, our condoms and sexual health collection offers a range of complementary products.

How Should You Use Sildenafil Teva?

Sildenafil Teva should be taken exactly as directed by your prescriber or pharmacist. Always swallow the tablet whole with a full glass of water — do not crush, chew, or split it, as this can affect how the medicine is absorbed and may alter its effectiveness.

What Is the Correct Dose of Sildenafil Teva?

The recommended starting dose for most adult men is 50mg, taken as needed. Your doctor may increase this to 100mg if the 50mg dose is not sufficiently effective, or reduce it to 25mg if you experience side effects or have certain health conditions. Always follow the dose your prescriber has recommended.

When Is the Best Time to Use Sildenafil Teva?

The ideal time to take sildenafil is approximately one hour before you plan to have sex, though it can work in as little as 30 minutes for some men. Taking it on an empty stomach or after a light, low-fat meal gives the fastest and most reliable absorption. Avoid taking it immediately after a large or fatty meal, as this can delay the onset by up to two hours.

There is no fixed time of day — simply take it when it suits your plans. The effect typically lasts for up to 4 to 5 hours, giving you a reasonable window of opportunity without needing to time things too precisely.

How Long Can You Use Sildenafil Teva For?

There is no defined maximum treatment duration for sildenafil. Many men use it safely on an as-needed basis for extended periods. It is good practice to review your treatment with your GP periodically, particularly if your health circumstances change or if you develop new medical conditions or start new medicines.

Lifestyle changes — including regular exercise, a balanced diet, reducing alcohol intake, and stopping smoking — can improve erectile function over time and may reduce your reliance on medication. Speak to your GP if you feel your condition is worsening or if the medicine stops working as effectively as it once did.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Sildenafil Teva?

Most men who take sildenafil tolerate it well, but like all medicines, it can cause side effects in some people. Common side effects affect up to 1 in 10 users and are generally mild and temporary, resolving within a few hours without any specific treatment.

  • Headache
  • Facial flushing (warmth or redness in the face, neck, or chest)
  • Indigestion or stomach discomfort
  • Nasal congestion or a blocked nose
  • Dizziness or light-headedness
  • Visual disturbances, including blurred vision or a blue-green colour tinge

What Are the Less Common Side Effects of Sildenafil Teva?

Less common side effects affect fewer than 1 in 100 people. These are worth being aware of, particularly if you are taking sildenafil for the first time or have recently had your dose adjusted.

  • Palpitations or a faster-than-normal heartbeat
  • Back pain or muscle aches
  • Nausea or vomiting
  • Skin rash or itching
  • Dry mouth
  • Fatigue or feeling unusually tired
  • Nosebleeds

What Are the Serious Side Effects of Sildenafil Teva?

Serious side effects are rare but require immediate medical attention if they occur. A prolonged erection lasting more than 4 hours — known as priapism — is a medical emergency. If left untreated, it can cause permanent damage to the erectile tissue. Stop taking sildenafil and seek emergency care straight away if this happens.

Sudden loss or significant reduction in vision or hearing has been reported in rare cases. If you experience either of these, stop taking the medicine immediately and contact your GP or go to your nearest A&E department. These events are uncommon but serious, and prompt action is essential.

What Should You Do If You Experience Side Effects of Sildenafil Teva?

For mild side effects such as headache or flushing, staying well hydrated and resting usually helps. Avoiding alcohol and large meals before taking the tablet can reduce the likelihood of indigestion and dizziness. If side effects are persistent, worsening, or affecting your quality of life, speak to your pharmacist or GP — a dose reduction may be appropriate.

You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps regulators monitor the safety of medicines in real-world use.

Can Sildenafil Teva Interact With Other Medicines?

Yes — sildenafil has several clinically significant drug interactions. The most important is with nitrates (used for angina), which can cause a severe and potentially life-threatening drop in blood pressure when combined with sildenafil. Alpha-blockers used for prostate conditions or high blood pressure can also lower blood pressure further when taken alongside sildenafil. HIV medicines such as ritonavir and antifungals such as ketoconazole can significantly increase sildenafil levels in the blood, raising the risk of side effects. Always tell your prescriber or pharmacist about all medicines, supplements, and herbal products you are taking before starting sildenafil.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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