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• Is Viagra available without prescription in the UK?
• What does Prescription Only Medicine (POM) mean in the UK?
• General information about sildenafil (Viagra)
• How Viagra works to treat erectile dysfunction
• Price and availability information
• Strengths, formulations and pack types
• Understanding erectile dysfunction
• UK legal classification: POM and online consultation
• Alternatives and other treatments for ED
• Viagra compared with other ED medicines
• Lifestyle, diet and sexual health
• Side effects and tolerability
• Long-term use and safety considerations
• Warnings, contraindications and interactions
• Additional information about generic Viagra

Is Viagra available without prescription in the UK?

Viagra, the brand name for sildenafil citrate, is classified as a Prescription Only Medicine (POM) in the United Kingdom. This means it is not legally available for general sale without a valid prescription from a qualified healthcare professional. In traditional pharmacy settings, Viagra must be dispensed only on presentation of a prescription issued by a doctor or an authorised prescriber.

However, in recent years a number of UK-registered online pharmacies offer a virtual consultation process. Patients can complete a medical questionnaire under the supervision of a pharmacist or doctor, and if clinically appropriate, receive an electronic prescription for Viagra. This mechanism allows you to purchase or order generic or branded Viagra online, often without the need to visit a clinic in person. Despite this convenience, the medicine remains prescription-only and is supplied legally through regulated channels.

For those seeking a cheaper alternative or generic sildenafil without prescription, it’s important to verify that the service is UK-registered, follows MHRA guidelines and employs qualified medical staff to review your request before supplying the medication.

What does Prescription Only Medicine (POM) mean in the UK?

The UK legal framework for medicines includes three main categories:

• POM (Prescription Only Medicine): Medicines that require a valid prescription from a doctor, dentist, or other authorised prescriber. Sale and supply are strictly controlled.
• P (Pharmacy medicine): Medicines that can be sold without a prescription but only under the supervision of a pharmacist in a registered pharmacy.
• GSL (General Sales List medicine): Medicines that can be sold in general retail outlets such as supermarkets or petrol stations, subject to package size and labelling restrictions.

Viagra falls under the POM category because it can interact with other medicines, is contraindicated in certain conditions, and requires appropriate clinical assessment before use. Although you can “order” or “buy” Viagra online, the process always includes a mandatory prescription step, whether via a physical paper prescription or an electronic prescription generated after a remote consultation.

General information about sildenafil (Viagra)

What is sildenafil?

Sildenafil citrate is the active pharmaceutical ingredient originally developed to treat angina. Its effect on erectile function was discovered incidentally during clinical trials, leading to its reclassification as a treatment for erectile dysfunction under the brand name Viagra.

What are phosphodiesterase type 5 inhibitors?

Sildenafil belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. Other members of this group include tadalafil (Cialis), vardenafil (Levitra) and avanafil (Spedra). These substances work by enhancing blood flow to the penis during sexual stimulation, improving the ability to achieve and maintain an erection.

Why is sildenafil prescribed for erectile dysfunction?

Erectile dysfunction (ED) is the inability to achieve or maintain an erection sufficient for satisfactory sexual performance. Sildenafil treats ED by relaxing smooth muscle in blood vessels supplying the penis and promoting increased blood flow.

Is Viagra an aphrodisiac?

No. Viagra does not increase sexual desire. It assists physiological processes in response to sexual arousal but does not affect libido or psychological factors related to sexual interest.

Is generic sildenafil the same as branded Viagra?

Generic sildenafil contains the same active ingredient at the same strength and must meet rigorous standards for quality, safety and efficacy. Differences may include the inactive ingredients, tablet shape, colour and packaging. A generic product can be significantly cheaper, offering a cost-effective alternative to branded Viagra in the UK.

Why are some tablets film-coated?

Film coatings improve stability, mask taste, facilitate swallowing and protect the active ingredient. Film-coated buttons may also carry branding and dosage information.

How Viagra works to treat erectile dysfunction

What is the role of PDE5?

Phosphodiesterase type 5 is an enzyme found in various tissues, including the corpus cavernosum of the penis. It breaks down cyclic guanosine monophosphate (cGMP), a molecule that mediates smooth muscle relaxation and vasodilation.

How does sildenafil affect PDE5?

Sildenafil selectively inhibits PDE5, preventing the breakdown of cGMP. Higher levels of cGMP result in prolonged smooth muscle relaxation and enhanced blood flow into the penile erectile tissue during sexual stimulation.

Does Viagra cause spontaneous erections?

No. Sexual arousal is required to initiate the release of nitric oxide, which in turn increases cGMP levels. Viagra enhances the natural erectile response to sexual stimulation.

How long does the effect last?

Sildenafil typically begins to work within 30 to 60 minutes and can remain effective for 4 to 6 hours. Individual response times may vary, and absorption can be influenced by food intake.

Does food affect absorption?

A high-fat meal can delay absorption, potentially postponing the onset of action. For faster and more reliable efficacy, it’s often recommended to take Viagra on an empty stomach or after a light meal.

Can repeated doses improve results?

Occasional repeated dosing within the same day is not recommended. Follow the prescribing information and do not exceed the maximum daily dose. Consult a healthcare professional for tailored advice.

Price and availability information

How much does Viagra cost in the UK?

Prices for Viagra and generic sildenafil vary by pack size, strength, brand or generic status, and pharmacy. Online retailers may offer competitive deals, “buy two packs, get one free” promotions, or subscription discounts for repeat orders.

As of September 2026, this information page from Alton Pharmacy is provided for guidance. For current availability, cheapest offers and exact pricing, please consult our online store or contact our pharmacy team.

Why do prices vary between pharmacies?

Retail pricing can reflect factors such as wholesale procurement costs, volume discounts, promotional offers, marketing strategies and pharmacy overheads. A lower price does not imply inferior quality if the product is authorised by the MHRA.

Example	Strength	Formulation	Price	Status	Note
Brand Viagra	50 mg	Film-coated tablet	Not stated	Prescription only	Ask Alton Pharmacy for price and prescription process
Generic sildenafil	100 mg	Film-coated tablet	Not stated	Prescription only	Available cheaper online with digital prescription

Strengths, formulations and pack types

What strengths of Viagra exist?

Viagra is marketed in three main strengths in the UK: 25 mg, 50 mg and 100 mg. The dose selected depends on individual response, tolerability and clinical factors. Initial treatment often begins at 50 mg, adjusted up or down as needed.

What formulations are available?

The standard presentation is a film-coated oral tablet. Anecdotal compounding of alternative forms (e.g., orally disintegrating formulations) exists but is less common in UK pharmacy practice.

Why does pack size matter?

Packs may contain 2, 4, 8 or 12 tablets. Digital prescriptions for online orders allow you to choose the most cost-effective pack size for your usage pattern.

Feature	Why it matters
Strength	Impacts dose and onset/duration of effect
Formulation	Affects absorption characteristics
Pack size	Influences overall cost and prescribing limits
Brand vs Generic	Price and perceived quality

Is generic sildenafil identical to branded Viagra?

Generic and branded products contain the same active moiety (sildenafil citrate). Regulatory approval ensures that generics meet bioequivalence criteria. Differences lie in excipients, tablet shape, colour and branding.

Understanding erectile dysfunction

What is erectile dysfunction (ED)?

ED is the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual performance. It can result from vascular, neurological, endocrine, psychological or lifestyle-related factors.

How common is ED?

ED affects an estimated 1 in 10 adult men in the UK to varying degrees, with prevalence increasing with age. However, it is not an inevitable consequence of aging and can be treated effectively in most cases.

What causes organic vs psychogenic ED?

• Organic ED: due to physical factors such as atherosclerosis, diabetes, hormonal deficiencies or medication side effects.
• Psychogenic ED: related to psychological issues such as stress, anxiety, depression or relationship problems.

Why is assessment important?

A proper medical evaluation can identify underlying conditions, guide treatment choice (e.g., PDE5 inhibitor vs psychosexual therapy) and ensure safe use of medications such as Viagra.

Can ED signal other health issues?

ED can be an early indicator of cardiovascular disease, hypertension or diabetes. Addressing ED may provide an opportunity to screen for and manage broader health risks.

UK legal classification: POM and online consultation

Why is Viagra a POM?

Due to potential interactions, health risks and the necessity for medical supervision, Viagra is classified as a Prescription Only Medicine. This ensures that a healthcare professional reviews your suitability, potential contraindications and concurrent medications.

How do online pharmacy consultations work?

1. You complete a secure online questionnaire covering medical history, current medications, allergies and erectile dysfunction details.
2. A UK-registered clinician or pharmacist reviews your responses, may ask follow-up questions, and decides whether Viagra is appropriate.
3. If approved, an electronic prescription is generated and sent to the pharmacy for dispensing.
4. Your order is processed, packaged discreetly and shipped to your address—often with next-day or two-day delivery options.

Is ordering without a physical prescription safe?

As long as the service is UK-registered, MHRA-regulated, uses qualified prescribers and provides genuine UK-licensed medication, ordering via an online consultation can be both safe and convenient. Avoid unlicensed websites or import-only suppliers that bypass UK regulations.

Alternatives and other treatments for ED

What other oral medications exist?

• Tadalafil (Cialis): longer duration (up to 36 hours); daily or as-needed dosing.
• Vardenafil (Levitra): similar onset to sildenafil, slightly different side effect profile.
• Avanafil (Spedra): rapid onset, approved for quick use before intercourse.

What non-pharmacological options are available?

• Penile injection therapy (alprostadil);
• Intraurethral suppositories;
• Psychosexual counselling and behavioural therapy;
• Pump devices (vacuum erection devices);
• Penile implants (surgical option in refractory cases).

Why choose one option over another?

Choice depends on underlying cause, patient preference, tolerability, convenience and cost. Oral PDE5 inhibitors like Viagra remain first-line due to ease of use and proven efficacy.

Viagra compared with other ED medicines

How does Viagra compare with Cialis?

Viagra (sildenafil) typically works for 4–6 hours, whereas Cialis (tadalafil) can remain effective up to 36 hours. Tadalafil daily dosing may suit those preferring spontaneity over timed dosing.

How does Viagra compare with Levitra and Spedra?

Levitra (vardenafil) and Spedra (avanafil) share the same general mechanism but differ in onset and interaction profiles. Avanafil has a faster onset (15–30 minutes) compared with sildenafil (30–60 minutes).

Feature	Viagra (sildenafil)	Cialis (tadalafil)	Spedra (avanafil)
Onset time	30–60 min	30–120 min	15–30 min
Duration	4–6 hrs	24–36 hrs	6–12 hrs
Food effect	High-fat delays	Minimal impact	Minimal impact
Daily dose option	No	Yes	No

Is one better than another?

No single PDE5 inhibitor is best for every patient. Clinical factors, dosing convenience, cost and side effect profiles guide personalised choice. A trial of different agents may determine optimal therapy.

Lifestyle, diet and sexual health

Can lifestyle changes improve ED?

Yes. Healthy weight, regular exercise, smoking cessation, moderation of alcohol intake and managing cardiovascular risk factors can enhance erectile function and complement pharmacological therapy.

How does diet influence ED?

A balanced diet rich in fruits, vegetables, whole grains, lean proteins and healthy fats supports cardiovascular health. Certain foods (e.g., flavonoid-rich berries, leafy greens) may have a modest positive effect on blood flow.

What role does psychological wellbeing play?

Stress, depression, anxiety and relationship issues can contribute to or exacerbate ED. Psychological support, counselling or therapy can be important adjuncts to medication.

Are supplements useful?

Many over-the-counter supplements claim to boost sexual performance. Lack of regulation and inconsistent evidence warrant caution. Always discuss supplements with a healthcare professional to avoid interactions with prescription ED medicines.

Side effects and tolerability

Can Viagra cause side effects?

Yes. Common side effects include headache, flushing, dyspepsia, nasal congestion, dizziness and visual disturbances. Most side effects are mild to moderate and often diminish with continued use.

System	Examples
Cardiovascular	Flushing, palpitations
GI tract	Indigestion, nausea
Nervous system	Headache, dizziness
Sensory	Altered vision, sensitivity to light
Rare reactions	Priapism (prolonged erection), hypersensitivity

What is priapism?

A rare but serious condition where an erection lasts longer than 4 hours. Immediate medical attention is required to prevent tissue damage and preserve erectile function.

Why do some users report visual effects?

Sildenafil can inhibit PDE6, an enzyme in the retina. This may cause temporary visual disturbances such as increased light sensitivity or blue-tinged vision.

Are there age-related considerations?

Elderly patients may be more sensitive to side effects, particularly hypotension and dizziness. A lower starting dose may be advisable under medical supervision.

Long-term use and safety considerations

Is it safe to use Viagra regularly?

Long-term use of sildenafil under medical guidance is generally considered safe for otherwise healthy men. Monitoring for side effects and cardiovascular status is recommended.

Can tolerance develop?

Unlike some classes of medication, sildenafil does not typically cause pharmacological tolerance, but underlying disease progression can affect efficacy over time.

Does long-term use carry unique risks?

Chronic use may unmask rare adverse effects or interact with new medications. Routine review by a healthcare professional helps ensure ongoing safety and appropriateness.

When should therapy be reviewed?

Annual check-ups or sooner if new health issues arise, symptom severity changes, or additional medications are started. Review may include cardiovascular assessment and evaluation of psychological wellbeing.

Warnings, contraindications and interactions

Who should not take Viagra?

• Men taking nitrates for chest pain or heart disease;
• Men with severe cardiovascular disorders, recent stroke or myocardial infarction;
• Men with hypotension (low blood pressure) or uncontrolled hypertension;
• Those with significant liver or kidney impairment without specialist advice;
• Men with known hypersensitivity to sildenafil or any excipient;
• Men advised against sexual activity due to health risks.

Can Viagra interact with other medicines?

Yes. Key interactions include:

• Nitrates: risk of severe hypotension;
• Alpha-blockers: additive blood pressure lowering effect;
• CYP3A4 inhibitors (e.g., ketoconazole, ritonavir): increased sildenafil exposure;
• Other PDE5 inhibitors: avoid combination therapy;
• Certain protease inhibitors: adjust sildenafil dose or avoid concurrent use.

Why is cardiovascular assessment important?

Sexual activity increases cardiac workload. Men with unstable angina, arrhythmias or recent cardiovascular events require evaluation to confirm the safety of ED therapy.

What about retinal and auditory risks?

Rare cases of non-arteritic anterior ischaemic optic neuropathy and sudden hearing loss have been reported. Men experiencing sudden vision or hearing changes should discontinue sildenafil and seek immediate medical attention.

Can Viagra be used in women?

Sildenafil is not licensed for female sexual dysfunction in the UK. Off-label use is not recommended without specialist supervision and supporting clinical evidence.

Is pregnancy or breastfeeding relevant?

Sildenafil is not indicated for use by women who are pregnant or breastfeeding. Discuss any off-label considerations with a qualified healthcare professional.

Additional information about generic Viagra

What does “generic sildenafil” mean?

A generic medicine contains the same active ingredient, dosage strength and therapeutic effect as the reference branded product. It must meet the same regulatory standards for quality, safety and efficacy.

Why can prices vary between generics?

Different generic manufacturers may have varying production costs, marketing strategies and distribution channels, leading to differences in retail price.

What should be checked on the packaging?

Ensure the product displays the MHRA UK license number, clear dosage instructions, batch number, expiry date and manufacturer details. Check for tamper-evident seals and correct storage conditions.

Where can I verify medicine information?

Reliable sources include the MHRA website, the electronic Medicines Compendium (eMC), the British National Formulary (BNF) and professional advice from pharmacists or prescribers.

Does this information replace professional advice?

No. This page is for general guidance. For personalised medical advice about purchasing, dosing, interactions or side effects, please speak to the pharmacy team at Alton Pharmacy, 68 High Street, Alton, Hampshire GU34 1ET.