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• Is Viagra available without prescription in the UK?
• What does Pharmacy medicine mean in the UK?
• General information about Viagra
• How sildenafil works
• Price and availability information
• Strengths, formulations and pack types
• Erectile dysfunction: causes and treatment
• UK legal classification: GSL, P and POM
• Alternatives to Viagra
• Viagra compared with other ED medicines
• Lifestyle considerations
• Side effects and tolerability
• Long-term use and considerations
• Warnings, contraindications and interactions
• Additional information about Viagra

Is Viagra available without prescription in the UK?

Viagra (sildenafil) is traditionally classified as a Prescription Only Medicine (POM) in the United Kingdom. As of September 2026, no sildenafil product at the standard 25-100 mg doses is legally available for sale without a prescription. Any offer to supply genuine Viagra or generic sildenafil at prescription strength without a valid prescription is not compliant with UK regulations. Alton Pharmacy provides professional advice on how to obtain a legitimate prescription and ways to purchase sildenafil safely and legally.

What does Pharmacy medicine mean in the UK?

In UK medicine regulation, Pharmacy medicines (P) can be supplied without a prescription but only under the supervision of a pharmacist. These products are kept behind the counter and require a brief assessment by a qualified pharmacist. This ensures that individuals receive the appropriate dosage information, understand potential interactions and are aware of contraindications before purchase. Viagra remains a POM, but in some countries lower-strength sildenafil products may be classified as Pharmacy medicines under supervised sale models.

General information about Viagra

What is Viagra?

Viagra is the brand name of a pioneering treatment for erectile dysfunction, containing the active ingredient sildenafil citrate. Since its launch in 1998, Viagra revolutionised the approach to ED by offering an effective oral therapy that enhances blood flow to the penile tissue.

What is sildenafil?

Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor. By blocking the PDE5 enzyme, sildenafil promotes relaxation of smooth muscle in the corpus cavernosum, enabling increased blood flow during sexual arousal.

Generic versus branded products

Generic sildenafil products contain the same active molecule as brand Viagra and meet regulatory standards for quality and efficacy. They are often sold at a lower price, making erectile dysfunction treatment more accessible.

Why choose generic sildenafil?

Opting for generic sildenafil can reduce treatment costs substantially while delivering the same clinical benefits as the brand-name product. Generic medicines undergo rigorous testing by the MHRA to confirm their bioequivalence.

How sildenafil works

Role of nitric oxide and cGMP

During sexual stimulation, nitric oxide is released in the penile tissue, increasing levels of cyclic guanosine monophosphate (cGMP). This molecule causes relaxation of vascular smooth muscle, allowing blood vessels to widen.

PDE5 inhibition

Sildenafil blocks PDE5, the enzyme that breaks down cGMP. By inhibiting PDE5, sildenafil prolongs the action of cGMP, sustaining an erection long enough for satisfactory sexual activity.

Onset of action and duration

Typically, Viagra takes effect within 30–60 minutes after oral administration. The duration of action ranges from 3 to 5 hours, although this can vary between individuals based on factors such as metabolism, age and concomitant food intake.

Food and absorption

A high-fat meal can delay absorption of sildenafil, potentially postponing its onset. Taking Viagra on an empty stomach is generally recommended for more predictable timing of effect.

Price and availability information

How much does Viagra cost in the UK?

Prescription-only Viagra prices depend on dosage strength, pack size and pharmacy mark-up. Generic sildenafil is typically cheaper. Prices may range from £1.50 to £3.50 per 50 mg tablet depending on offers, quantity and retailer.

Can I purchase Viagra online?

Only pharmacies with registered online doctor services or online pharmacy supervision may legally provide Viagra. A valid online consultation followed by a prescriber’s approval is required before sildenafil is dispensed.

Why do prices vary?

Factors influencing price include brand versus generic status, quantity discounts, supply chain costs and whether an online doctor consultation fee is included. Comparing total cost per tablet is essential.

Example	Strength	Pack size	Price	Status	Note
Brand Viagra	50 mg	4 tablets	£25.00	POM	Prescription required
Generic sildenafil	50 mg	8 tablets	£20.00	POM	Plus online consultation
Bulk generic	100 mg	28 tablets	£60.00	POM	Better value per tablet

Strengths, formulations and pack types

What strengths of sildenafil exist?

Sildenafil is most commonly available in 25 mg, 50 mg and 100 mg film-coated tablets. The starting dose for most men is 50 mg, adjustable based on efficacy and tolerability.

Why choose a lower or higher strength?

Starting with a moderate 50 mg dose allows evaluation of both effect and side effects. Dose adjustments may be needed for older patients, those with hepatic or renal impairment, or those taking interacting medicines.

Pack size options

Pack sizes range from 4 to 28 tablets. Smaller packs are suitable for initial trials, while larger packs offer greater convenience and lower cost per dose for established users.

Special formulations

Alternative formulations such as orally disintegrating tablets (ODTs) are available in some markets to facilitate use without water, though these remain prescription-only in the UK.

Erectile dysfunction: causes and treatment

What is erectile dysfunction?

Erectile dysfunction (ED) is the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual intercourse. ED can have physical, psychological or combined origins.

Common physical causes

• Cardiovascular disease;
• Diabetes;
• Hypertension;
• Neurological disorders;
• Hormonal imbalances;
• Side effects of medications.

Psychological factors

Anxiety, stress, depression and relationship issues can contribute or exacerbate ED. A holistic approach often yields the best outcomes.

Role of sildenafil in treatment

Sildenafil enhances the physiological erection process, but addressing underlying causes and lifestyle factors is also important for sustained improvement.

UK legal classification: GSL, P and POM

What is a POM?

Prescription Only Medicine status means Viagra can only be supplied against a valid prescription from a UK-registered prescriber or via an accredited online service.

What is a Pharmacy medicine?

Pharmacy medicines can be sold without prescription but under pharmacist supervision. No sildenafil product currently holds P status in the UK.

What is a GSL medicine?

General Sales List medicines can be sold in any retail outlet. Erectile dysfunction medicines are not available as GSL in the UK.

Why no OTC sildenafil?

Clinical oversight is considered necessary due to potential contraindications, interactions (e.g. nitrates) and the need to assess cardiovascular risk before initiating treatment.

Alternatives to Viagra

Other PDE5 inhibitors

• Tadalafil (Cialis);
• Vardenafil (Levitra);
• Avanafil (Spedra).

How do they differ?

They share a common mechanism but differ in onset, duration and side effect profiles. Tadalafil’s longer half-life allows dosing up to once daily; vardenafil may have faster onset.

Prescription treatments

For those not responding to PDE5 inhibitors, second-line options include intracavernosal injections, intraurethral alprostadil or vacuum erection devices under specialist supervision.

Viagra compared with other ED medicines

Feature	Viagra (sildenafil)	Cialis (tadalafil)	Levitra (vardenafil)
Class	PDE5 inhibitor	PDE5 inhibitor	PDE5 inhibitor
Onset	30–60 min	30–60 min	25–60 min
Duration	3–5 hours	36 hours	4–5 hours
Food effects	High-fat delays	Minimal	Moderate delay
Prescription status	POM	POM	POM

Is one better?

No single PDE5 inhibitor is superior in all respects. Choice depends on lifestyle, treatment goals, comorbidities and personal response.

Lifestyle considerations

Diet and exercise

Healthy weight, balanced diet and regular physical activity can improve vascular health and erectile function. Reducing saturated fats and sugars supports cardiovascular performance.

Alcohol and smoking

Excessive alcohol can worsen ED. Smoking damages blood vessels and may reduce response to sildenafil. Smoking cessation and moderate alcohol intake are advisable.

Stress management

Psychological stress can impair sexual function. Mindfulness, counselling or therapy may complement medical treatment for ED.

Side effects and tolerability

Common side effects

Headache, flushing, dyspepsia, nasal congestion and visual disturbances (blue tinge) are commonly reported. These effects are usually mild to moderate and transient.

Uncommon effects

Dizziness, back pain, myalgia and rash may occur. They typically resolve upon dose adjustment or discontinuation.

Serious reactions

Priapism (prolonged erection >4 hours) and sudden vision loss are rare but require immediate medical attention.

Area	Examples
Cardiovascular	Palpitations, tachycardia
Neurological	Headache, dizziness
Musculoskeletal	Back pain, muscle aches
Visual	Blurred vision, sensitivity to light
Allergic	Rash, pruritus

Long-term use and considerations

Is chronic sildenafil use safe?

Studies of long-term PDE5 inhibitor use up to several years show an acceptable safety profile. Regular review by a healthcare professional is advisable for ongoing therapy.

Effectiveness over time

Tolerance does not appear to be a major issue with sildenafil, but underlying health changes may alter its efficacy.

Medically supervised review

Periodic assessment ensures dose appropriateness, checks for emerging contraindications and evaluates whether underlying conditions have changed.

Warnings, contraindications and interactions

Who should not take sildenafil?

• Men on nitrates or nicorandil;
• Those with severe cardiovascular disease or recent stroke/MI;
• Individuals with severe hepatic or renal impairment;
• Patients with known hypersensitivity to sildenafil.

Drug interactions

Sildenafil is metabolised by CYP3A4. Potent inhibitors (e.g. ketoconazole, ritonavir) can increase sildenafil levels; inducers (e.g. rifampicin) can reduce efficacy.

Why avoid nitrates?

Concomitant use of nitrates and sildenafil can cause life-threatening hypotension due to excessive vasodilation.

Use in other populations

Women and children are not approved for sildenafil in ED treatment. Off-label use requires specialist oversight.

Additional information about Viagra

What does “generic sildenafil” mean?

A generic product contains the same active ingredient as Viagra and is required to demonstrate bioequivalence. Differences may exist in excipients, appearance and packaging.

Why check exact product information?

Each authorised medicine has a specific Summary of Product Characteristics (SmPC) and patient leaflet. Always verify strength, manufacturer and instructions before use.

How to verify UK medicine information

Reliable sources include the MHRA, electronic Medicines Compendium (eMC), NICE guidelines and qualified healthcare professionals.

Does this information replace pharmacist advice?

No. This page is general information published by Alton Pharmacy, 68 High Street, Alton, Hampshire GU34 1ET. For personalised advice on Viagra or any other medicine, please consult the pharmacy team.