Sildenafil Zentiva from £0.36 per tablet
Generic sildenafil from £0.36 per tablet on your first order - 20% off with code Ednew.
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Sildenafil Zentiva Price, Strengths and How to Order in the UK
Published: 7 November 2026
Sildenafil Zentiva is a generic version of Viagra used to treat erectile dysfunction, available in the UK on prescription. Like other sildenafil products, it contains the same active ingredient as branded Viagra but is typically more affordable. At Cured Pharmacy, generic sildenafil starts from £0.36 per tablet (first order with code Ednew), following a safe online consultation with a UK-registered prescriber.
Key takeaways
- Sildenafil Zentiva is a generic version of Viagra, containing the same active ingredient at a lower price.
- Generic sildenafil at Cured Pharmacy starts from £0.36 per tablet with code Ednew on your first order.
- All sildenafil products require a prescription after an online consultation with a UK prescriber.
- Sildenafil is taken about one hour before sex and works only when you are sexually aroused.
- Never take sildenafil with nitrates, nicorandil or poppers, as this can cause dangerous low blood pressure.
What is sildenafil zentiva and how does it work?
Sildenafil Zentiva is a generic sildenafil tablet manufactured by Zentiva, containing the same active ingredient as Viagra [3]. It belongs to a class of medicines called PDE5 inhibitors, which work by relaxing blood vessels in the penis to help achieve and maintain an erection when sexually aroused [1].
Sildenafil does not cause an erection on its own; sexual stimulation is still needed for the medicine to work [3]. The tablet is typically taken about one hour before sexual activity, and its effects can last for up to four hours, though this varies between individuals [1]. It is important to understand that sildenafil treats the physical symptoms of erectile dysfunction but does not cure the underlying cause [2].
All sildenafil products, whether branded or generic, contain the same active ingredient and work in the same way. Generic versions like Sildenafil Zentiva are bioequivalent to Viagra, meaning they are absorbed and work in the body at the same rate and to the same extent [3]. The main difference is usually the price, with generics being more affordable.
Sildenafil zentiva strengths and how it is supplied
Sildenafil Zentiva is available in three strengths: 25mg, 50mg and 100mg tablets [3]. The most common starting dose for most men is 50mg, taken approximately one hour before sexual activity [3]. Depending on how well the medicine works and whether any side effects occur, the dose may be increased to 100mg or reduced to 25mg by the prescriber [3].
The tablets should be swallowed whole with water and can be taken with or without food, though a heavy or high-fat meal may delay how quickly the medicine starts to work [3]. Sildenafil should only be taken once in any 24-hour period, and you should not take more than the dose prescribed for you [3].
At Cured Pharmacy, generic sildenafil (which may be supplied as Sildenafil Zentiva or another manufacturer's version, depending on stock) is dispensed in blister packs. The exact brand supplied may vary, but all generic sildenafil products meet the same UK quality and safety standards and contain the same active ingredient at the same strength [12]. Your prescription will specify the strength and quantity, and our pharmacists will dispense an appropriate licensed generic product.
How to take sildenafil safely
Take sildenafil about one hour before you plan to have sex, though it can be taken anywhere from 30 minutes to four hours beforehand [3]. Do not take more than one dose in 24 hours, even if the first dose did not work as well as you hoped [3]. If sildenafil does not work after trying it on several occasions, speak to your prescriber, as a different strength or a different type of ED medicine may be more suitable [2].
At a glance
What affects the price of sildenafil zentiva?
The price of sildenafil can vary depending on several factors, including the manufacturer, the strength, the quantity ordered and whether you choose a branded or generic product. Generic sildenafil, including Sildenafil Zentiva, is usually much more affordable than branded Viagra because the manufacturer does not need to recover the original research and development costs [3].
At Cured Pharmacy, generic sildenafil starts from £0.45 per tablet, or £0.36 per tablet on your first order when you use the code Ednew. This represents a 20% discount and applies to all our ED treatments. Branded Viagra, by comparison, costs £37.95 (£30.36 with code Ednew) for the same active ingredient and strength [12].
Other factors that can influence price include the tablet strength (higher strengths may cost slightly more per tablet) and the pack size (larger quantities often offer better value per tablet). Some online pharmacies may advertise very low prices but add hidden fees at checkout, so it is important to check the total cost including delivery. At Cured Pharmacy, delivery is free on orders over a certain value, and all prices shown include VAT.
It is worth noting that sildenafil is not usually available on the NHS for erectile dysfunction unless the condition is caused by certain medical conditions such as diabetes, prostate cancer treatment, or severe distress [2]. Most men will need to pay privately, which is why choosing an affordable generic option can make treatment more accessible.
Comparing sildenafil zentiva with other ED treatments
Sildenafil is just one of several PDE5 inhibitor medicines licensed in the UK to treat erectile dysfunction. The others include tadalafil (Cialis), vardenafil (Levitra) and avanafil (Spedra) [2]. Each works in a similar way but differs in how quickly it starts to work and how long the effects last.
Tadalafil can be taken on-demand (10mg or 20mg at least 30 minutes before sex) or as a daily low-dose tablet (2.5mg or 5mg), and its effects can last up to 36 hours, which is why it is sometimes called the 'weekend pill' [4]. Vardenafil works similarly to sildenafil, taking about 25 to 60 minutes to start working [5]. Avanafil is the fastest-acting option, often working within 15 to 30 minutes [6].
The choice between these medicines depends on your lifestyle, how often you have sex, and how your body responds to each medicine. Some men find one works better for them than another, or prefer the longer window of tadalafil, while others prefer the familiarity and lower cost of sildenafil. All require a prescription and must be prescribed after a clinical assessment [2].
Generic versions of these medicines are usually much cheaper than the branded equivalents. For example, generic tadalafil at Cured Pharmacy starts from £7.95 (£6.36 with code Ednew), compared to £12.00 (£9.60 with code Ednew) for branded Cialis. The table below compares the main options available.
Which ED treatment is right for you?
There is no single 'best' ED medicine; the right choice depends on your individual circumstances, other medicines you take, and your preferences. Your prescriber will review your medical history and current medications during the online consultation to recommend the safest and most suitable option for you [2]. If one medicine does not work well or causes side effects, switching to a different PDE5 inhibitor may help.
Take sildenafil on an empty stomach
For faster results, take sildenafil on an empty stomach or after a light meal. A heavy or high-fat meal can delay how quickly the medicine starts to work.
How to order sildenafil zentiva safely online
Sildenafil is a prescription-only medicine in the UK, which means it can only be supplied after a consultation with a qualified prescriber [3]. At Cured Pharmacy, the process is straightforward and confidential. You start by completing a short online health questionnaire that asks about your medical history, current medications, and any other health conditions [2].
Your answers are reviewed by a UK-registered prescriber (a doctor or an independent prescriber pharmacist), who will check that sildenafil is safe and suitable for you. This includes checking for any medicines or health conditions that could interact with sildenafil or make it unsafe [3]. If approved, your prescription is sent electronically to our pharmacy, and your medicine is dispensed and posted to you in discreet, unmarked packaging.
It is important to answer all questions honestly and completely. Do not leave out any medicines you take, including over-the-counter products, herbal remedies or recreational drugs, as some can cause serious interactions with sildenafil [3]. For example, sildenafil must never be taken with nitrate medicines (used for angina), nicorandil, riociguat, or recreational drugs called 'poppers', as the combination can cause a dangerous drop in blood pressure [3].
If you take alpha-blockers for an enlarged prostate or high blood pressure (such as tamsulosin or doxazosin), or medicines that affect how your body breaks down sildenafil (such as ritonavir, ketoconazole or clarithromycin), the prescriber will need to adjust your dose or may recommend a different treatment [3]. Always declare every medicine you take, and never order prescription medicines from websites that do not require a proper consultation.
Important safety information about sildenafil zentiva
Sildenafil is generally well tolerated, but like all medicines, it can cause side effects in some people. Common side effects include headaches, flushing, indigestion, nasal congestion and dizziness [3]. These are usually mild and go away on their own. Drinking plenty of water and avoiding heavy meals or excessive alcohol can help reduce some of these effects.
Rare but serious side effects require urgent medical attention. If you experience an erection that lasts longer than four hours (priapism), sudden loss of vision or hearing, or chest pain during sex, stop taking sildenafil and seek immediate medical help [3]. Priapism can cause permanent damage to the penis if not treated quickly, and sudden vision loss may be a sign of a condition called NAION [3].
Sildenafil is not suitable for everyone. It should not be used if you have severe heart or liver problems, very low blood pressure, a recent stroke or heart attack, certain inherited eye conditions, or if you are taking any of the medicines listed above that interact dangerously with sildenafil [3]. Your prescriber will check your suitability during the consultation.
If you experience any side effects, even those not listed in the patient information leaflet, you can report them via the Yellow Card Scheme at www.mhra.gov.uk/yellowcard. If you are unsure whether a symptom is related to sildenafil, contact your GP or pharmacist for advice. Never stop taking other prescribed medicines without speaking to your doctor first, even if you think they might be interacting with sildenafil.
When to see your GP about erectile dysfunction
If you are experiencing erectile dysfunction for the first time, it is a good idea to see your GP for a check-up [1]. ED can be an early warning sign of underlying health conditions such as diabetes, high blood pressure, high cholesterol or heart disease [2]. Your GP can arrange tests, review your overall health, and discuss both lifestyle changes and treatment options. Treating the underlying cause can sometimes improve ED without the need for medication [2].
When to get urgent help
- Erection lasting more than 4 hours (priapism) - go to A&E immediately to prevent permanent damage
- Sudden loss of vision in one or both eyes - stop taking sildenafil and seek urgent medical help
- Sudden decrease or loss of hearing, sometimes with ringing in the ears or dizziness
- Chest pain during or after sex - stop sexual activity and call 999 if the pain does not go away
- Severe allergic reaction (rash, swelling of face or throat, difficulty breathing) - call 999
Call 999 or go to A&E in an emergency, or contact NHS 111 for urgent advice.
Scientific References
- NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 7 November 2026]
- National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 7 November 2026]
- Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 7 November 2026]
- Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 7 November 2026]
- Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 7 November 2026]
- Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 7 November 2026]
- Electronic Medicines Compendium. (n.d.). Summaries of Product Characteristics and Patient Information Leaflets. https://www.medicines.org.uk/emc/ [accessed 7 November 2026]
Information on this page is for educational purposes only and is not medical advice. Prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting or changing any medication.
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Is Sildenafil Zentiva the same as Viagra?
Yes, Sildenafil Zentiva contains the same active ingredient as Viagra (sildenafil citrate) and works in exactly the same way. The main difference is that Zentiva is a generic version, so it is usually much more affordable than the branded product.
How much does sildenafil zentiva cost in the UK?
Generic sildenafil at Cured Pharmacy starts from £0.45 per tablet, or £0.36 per tablet on your first order with code Ednew. The exact price depends on the strength and quantity you order.
Do I need a prescription for sildenafil zentiva?
Yes, sildenafil is a prescription-only medicine in the UK. You will need to complete an online consultation with a UK-registered prescriber, who will review your health and issue a prescription if it is safe and suitable for you.
Can I get sildenafil on the NHS?
Sildenafil is not usually available on the NHS for erectile dysfunction unless your ED is caused by certain conditions such as diabetes, prostate surgery or severe distress. Most men will need to pay privately for treatment.
What strength of sildenafil should I take?
The usual starting dose is 50mg, taken about one hour before sex. Your prescriber may increase this to 100mg or reduce it to 25mg depending on how well it works and whether you experience any side effects.
Can I take sildenafil zentiva with other medicines?
Sildenafil can interact with several medicines, including nitrates, alpha-blockers and some antibiotics or antifungals. Always tell your prescriber about every medicine you take, including over-the-counter products and herbal remedies, so they can check for interactions.
How long does sildenafil zentiva last?
Sildenafil usually starts to work within 30 to 60 minutes, and its effects can last for up to four hours. This does not mean you will have an erection for four hours; it means the medicine can help you get an erection during that time if you are sexually aroused.
What should I do if sildenafil does not work?
If sildenafil does not work after trying it on several occasions, speak to your prescriber. They may suggest increasing the dose, trying a different PDE5 inhibitor such as tadalafil or vardenafil, or investigating other causes of your erectile dysfunction.
Medically reviewed by
Tarun Kumar, Superintendent Pharmacist (GPhC 2233073)