It is a common condition and can have physical, psychological, or mixed causes.

What happens if the prescriber decides treatment is not suitable?

Do not take more than one tablet in 24 hours. Always use as directed by your healthcare professional. Not suitable if you are taking nitrate medicines or certain heart medications. Always read the patient leaflet and follow medical advice. Erectile dysfunction is the persistent difficulty in achieving or maintaining an erection sufficient for satisfactory sexual activity. ED may be associated with underlying medical conditions such as cardiovascular disease, diabetes,

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Kamagra Oral Jelly	100mg	10 Sachets	54.55€ 51.95€
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high blood pressure, hormonal imbalance, or mental health factors such as stress or anxiety.

What It Contains

Check access to the full text by signing in through your organization. Bismuth film electrode for stripping voltammetric measurement of sildenafil citrate2012, Electrochimica ActaCitation Excerpt :It has been proposed that the anodic voltammetric signals of SC at the bare GCE, recorded at ca 1.0 V and 1.2 V vs. Ag/AgCl in acetate buffer solution (pH 4.7) containing 30% of acetonitrile, are attributed to the oxidation of the piperazine ring sildenafil uk price of the SC molecule [13]. For the cathodic processes, observed at the mercury electrode at approximately −1.05 V and −1.15 vs. Ag/AgCl in 0.01 M HClO4 (pH 2) [14], and also at the GCE at ca −1.4 V [13], the reduction of the sulfonyl group was suggested by Rodriguez et al.

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[14,15], but opposed by Zuman et al. [13], yet neither of these claims were supported by a clear experimental evidence. Our initial experiments were focused on the comparative examination of SC using cyclic voltammetry in combination with the bare glassy carbon electrode and the ex situ prepared bismuth film electrode with the potential scanning in the negative direction in the range of −0.3 V to −1.5 V. It has been proposed that the anodic voltammetric signals of SC at the bare GCE, recorded at ca 1.0 V and 1.2 V vs. Ag/AgCl in acetate buffer solution (pH 4.7) containing 30% of acetonitrile, are attributed to the oxidation of the piperazine ring of the SC molecule [13].

Marketing and sales

Spectrophotometric determination of sildenafil citrate in pure form and in pharmaceutical formulation using some chromotropic acid azo dyes2010, Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy Gold nanoparticles-modified screen-printed carbon electrode for voltammetric determination of sildenafil citrate (Viagra) in pure form, biological and pharmaceutical formulations2015, International Journal of Electrochemical Science Determination of sildenafil citrate (Viagra®) in various pharmaceutical formulations by flow injection analysis with multiple pulse amperometric detection2012, Journal of the Brazilian Chemical Society Continuous potentiometric monitoring of viagra (sildenafil) in pharmaceutical preparations using novel membrane sensors2006, Journal of Applied Electrochemistry Erectile dysfunction (ED) is a common condition where a man has difficulty getting or maintaining an erection firm enough for sexual activity. It can happen at any age and may be linked to stress, anxiety, tiredness, lifestyle factors, or reduced blood flow. ED is very common and nothing to be embarrassed about. With the right treatment, many men are able to restore confidence and enjoy a healthy, satisfying sex life. Sildenafil tablets are a well-established treatment for erectile dysfunction. A clinical assessment is required to determine suitability for treatment.

ED can be a symptom of underlying health conditions like diabetes or heart disease.
Treating the root cause is as important as treating the symptom of ED.
Psychological factors like stress or anxiety can also contribute to ED.
Counselling or therapy can be beneficial alongside medical treatment.
Sildenafil can help build confidence by providing reliable results.
Open communication with your partner about ED is often very helpful.
A vacuum pump is a non-pharmacological alternative treatment for ED.
Penile implants are a surgical option for cases that don't respond to medication.
Always discuss all treatment options thoroughly with your doctor.

For some individuals, prescription medicines may be appropriate.

Consider the cost per tablet when comparing different treatment packages.
Larger packs (e.g., 12 tablets) often have a lower cost per dose.
Some providers offer introductory discounts for first-time customers.
Look for voucher codes on reputable discount code websites.
Payment methods typically include major credit/debit cards and sometimes PayPal.
Your bank statement will show a discreet descriptor, not the medication name.
The prescription is usually valid for six months from the date of issue.
You can request a repeat prescription before your current supply runs out.
A follow-up consultation may be required for ongoing treatment.

These medicines work by improving blood flow to the penis during sexual stimulation.

Buying sildenafil in the UK requires a valid prescription, unless obtained from licensed online pharmacies.
UK law prohibits the sale of prescription-only medications without a prescription.
Some online pharmacies provide consultation services to assess user suitability for sildenafil.
Ensure the online pharmacy uses secure payment methods to protect personal information.
Look for UK-based pharmacies with proper certification or accreditation like the GPhC logo.
Check reviews and ratings before purchasing sildenafil from any online source.
Beware of counterfeit sildenafil; always verify the legitimacy of the seller.
Discounts and bulk purchase options might be available at licensed UK online pharmacies.
Delivery times can vary; confirm shipping policies before completing your order.
Always keep medications out of reach of children and follow storage instructions carefully.

They are not suitable for everyone and must only be supplied following a clinical assessment.

Review Aspect	Positive Comments	Negative Comments
Price	Affordable options; discounts available	Sometimes higher prices at local stores
Delivery Speed	Fast, discreet packaging	Occasional delays due to customs
Product Quality	Many report genuine products	Some encountered counterfeit items
Customer Support	Responsive, helpful staff	Difficulties with refunds

Erectile dysfunction medicines are classified as Prescription Only Medicines (POMs) under UK law. This ensures they are supplied safely and appropriately, following an assessment by a qualified prescriber, in line with MHRA regulations.

What side effects could I expect?

“It is also considered that there is a low risk of direct danger and of intentional abuse that will lead to a danger to human health.” The MHRA highlights the benefits that pharmacy supply of sildenafil would bring, which it says outweighs the risks involved, “bringing a hard to reach group into healthcare environment with the potential to increase earlier identification of heart disease and also reducing the risks associated with use of counterfeits obtained via the internet”. Berkeley Phillips, medical director at Pfizer UK, says reclassifying the product as a P medicine “could offer men a new and additional way to access a legitimate, long established, and well-studied treatment for erectile dysfunction”. “This could have further benefits as the condition may be an early warning sign of a more serious underlying condition, such as heart disease, which may otherwise go undetected,” he adds. The company confirmed that if the proposal goes ahead the product will also still be available on prescription. The Royal Pharmaceutical Society (RPS), the professional leadership body for pharmacists in Great Britain, supports the MHRA’s reclassification proposal.

Gold nanoparticles-modified screen-printed carbon electrode for voltammetric determination of sildenafil citrate (Viagra) in pure form, biological and pharmaceutical formulations

Martin Astbury, its president, says: “The potential switch… increases access to a medicine that has been proven to be safe and effective when used appropriately through over a decade of real-world use by millions of men.” He adds that the move will help identify more men who may be at risk of cardiovascular disease whom pharmacists will be able to refer to GPs. “It will also help improve medicines safety as sildenafil is one of the most counterfeited medicines.” If the product is reclassified, Astbury says the RPS will provide advice and guidance to pharmacists about the treatment of erectile dysfunction. When you get aroused, your body produces a molecule called cGMP which helps to stimulate an erection by increasing blood flow to the penis.1 All content on this page has been medically reviewed by: Hassan Thwaini, Clinical Pharmacist and Copywriter, Master of Pharmacy (MPharm) on 30 March, 2026. Viagra Connect was the first erectile dysfunction (ED) treatment available in the UK without a prescription. It contains sildenafil, the same active ingredient found in prescription Viagra, which is a medicine that’s been trusted by millions of men worldwide since it first came to market in the late 1990s.

Erectile dysfunction

Launched as an over-the-counter option in 2018, Viagra Connect was developed to make ED treatment more accessible and discreet. Instead of needing a GP appointment, it can now be purchased directly following a short consultation or assessment with a pharmacist. Viagra Connect, which contains sildenafil, typically takes around 30-60 minutes to start working and lasts for up to 4 hours.1 When you get aroused, your body produces a molecule called cGMP which helps to stimulate an erection by increasing blood flow to the penis.1 However, for people experiencing erectile difficulties, an enzyme known as PDE5 normally breaks cGMP down, restricting blood flow and causing the erection to subside.1 Viagra Connect blocks the action of PDE5, allowing more blood to flow to the penis. The resulting erection is firmer and usually lasts long enough to allow for satisfying sex.1 The difference between Viagra and Viagra Connect is that Viagra is only available via a prescription, whereas Viagra Connect can be bought over the counter without a prescription. We’re a holistic health platform built to help you take control, with treatment, guidance, and ongoing support that actually works. You will be asked to complete an online medical questionnaire covering

Access through your organization

When you choose Viagra Connect with Numan, you’re not just getting medication, but complete care designed to help you perform your best. Complete a Numan Erectile Dysfunction Blood Test to uncover underlying causes such as low testosterone or cardiovascular risk factors, so you can get more effective treatment. Get access to our doctors and clinicians should you require any medical help with your treatment. If hormone issues related to erectile dysfunction are suspected, Numan offers access to a dedicated team who provide personalised treatment, monitoring, and support. All treatments are shipped quickly for free, in discreet packaging directly to your desired address.

What are the risks or side effects of Viagra?

And if plans change, so can your delivery, all online. With thousands of successful patients behind us, our approach is tried, tested, and trusted. Viagra Connect has the same side effect profile as both Viagra and generic sildenafil. Some of these side effects can be found in the table below, and for a full list of side effects, please read the Patient Information Leaflet found in each box.2 Find the clinically proven ED treatment that suits you best. Specialists in medicine, nutrition, performance, and diagnostics.

Spectrophotometric determination of sildenafil citrate in pure form and in pharmaceutical formulation using some chromotropic acid azo dyes

BSc (Hons) MBBS MRCGP AFHEA MA (Hons) AFMCP Viagra Connect 50 mg film-coated tablets. Viagra Connect 50 mg film-coated tablets. 2nd in the world, 1st in the UK and Europe Viagra remains one of the most trusted treatments for erectile dysfunction in the UK, helping men regain confidence and intimacy Imperial's Schools of Convergence Science facilitate mission-led tips for safe ED medication purchases online, transdisciplinary work and unique combinations of knowledge in order to further our Science for Humanity strategy. How we shape the future – for our students, our community, our planet and everyone who calls it home. A gift to Imperial can provide vital bursaries, scholarships and a lifeline to a student in financial difficulty. your symptoms, medical history, and any medicines you are currently taking.

Non-medical use

They help improve blood flow to the penis, making it easier to achieve and maintain an erection when sexually aroused. Sildenafil does not cause an erection on its own — sexual stimulation is still required. It is a popular and trusted option, known for its reliability and effectiveness. Sildenafil can be taken with or without food, but heavy or fatty meals may slow its absorption. Take one tablet about 30–60 minutes before sexual activity.