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Is viagra available without prescription in the UK?

In the United Kingdom, the original branded product Viagra (sildenafil 25 mg, 50 mg, 100 mg) is classified as a Prescription Only Medicine (POM). This means a valid prescription from a qualified healthcare professional is required to purchase Viagra from a pharmacy. However, since 2013 the MHRA has authorised a pharmacy-only presentation of sildenafil – commonly known as Viagra Connect – which contains 50 mg of sildenafil and can be supplied by a pharmacist after a consultation without a formal prescription. This pharmacy medicine (P) route allows men aged 18 and over with no contraindications to obtain a single pack for short-term use, provided they pass a screening questionnaire under supervision of a registered pharmacist. Generic sildenafil tablets of 25 mg and 100 mg remain POM and cannot be supplied without a prescription.

What does Pharmacy medicine mean in the UK?

In UK law, medicines are categorized into three main legal supply classifications: Prescription Only Medicine (POM), Pharmacy medicine (P) and General Sales List medicine (GSL). A Pharmacy medicine can be supplied without a prescription but only under the supervision of a pharmacist, either in a registered pharmacy or through an online platform complying with MHRA requirements. The pharmacist must ensure that the medicine is appropriate for the individual, check for interactions, contraindications and proper usage, and provide necessary advice. Pharmacy-only status is intended to balance access to effective treatments for self-limiting conditions or for safe short-term use, while still ensuring professional oversight.

General information about Viagra

What is Viagra?

Viagra is the trade name for a medicine whose active ingredient is sildenafil citrate. It belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors. Sildenafil was the first PDE5 inhibitor approved for the treatment of erectile dysfunction (ED) and has since become one of the most widely known and prescribed therapies for men experiencing difficulty in achieving or maintaining an erection sufficient for sexual activity.

What is erectile dysfunction?

Erectile dysfunction is the inability to obtain or maintain an erection adequate for satisfactory sexual performance. It can be caused by a variety of factors, including vascular disease, neurological conditions, diabetes, hormone imbalances, psychological factors or medication side effects. ED affects men of all ages but is more common in older age groups.

Who can use sildenafil?

Viagra is indicated for adult men over 18 years old who have a clinical diagnosis of erectile dysfunction. It should only be used under guidance where underlying causes have been assessed. Men with certain cardiac conditions or taking nitrates must not use sildenafil due to the risk of serious hypotension.

What forms does Viagra come in?

Branded Viagra is supplied as film-coated tablets containing 25 mg, 50 mg or 100 mg of sildenafil citrate. The tablets are gastro-resistant and designed to dissolve in the small intestine for optimal absorption. Generic sildenafil formulations share the same active ingredient but may differ in appearance, excipients and packaging.

How sildenafil works

What is PDE5?

Phosphodiesterase type 5 (PDE5) is an enzyme found in the smooth muscle of blood vessels, including those supplying the corpus cavernosum of the penis. PDE5 breaks down cyclic guanosine monophosphate (cGMP), which is a key molecule in the relaxation of smooth muscle cells and vasodilation required for erection.

Mechanism of action

Sildenafil inhibits PDE5, leading to increased levels of cGMP within smooth muscle cells. Elevated cGMP promotes relaxation of penile blood vessels, improving blood flow into the corpora cavernosa, and enabling an erection in response to sexual stimulation. Without sexual arousal, sildenafil has little direct effect.

Onset and duration

Sildenafil is typically taken 30 to 60 minutes before sexual activity. Its onset may vary depending on individual factors such as meal composition; a high-fat meal can delay absorption. The effective duration is generally 4 to 6 hours, but residual effects can persist longer in some men.

Difference from other ED treatments

Other ED therapies include tadalafil, which can last up to 36 hours, and vardenafil, which has a similar profile to sildenafil. The choice between PDE5 inhibitors can be guided by onset, duration, side-effect profiles and individual preference.

Price and availability information

How much does Viagra cost in the UK?

Retail prices for sildenafil vary by brand (Viagra vs generic), strength, pack size and supplier. Prices can range from around £30 for a pack of four 50 mg branded tablets to as low as £15–£20 for generic options per four-tablet pack. Online pharmacies may offer discounts or subscription pricing that can reduce the cost per tablet. Please contact Clinical Care Pharmacy in Derby for the latest pricing and availability.

Why do prices vary?

Factors influencing price include branding, marketing, authorized pack sizes, distributor agreements and retailer promotions. Generic sildenafil is generally cheaper due to lower manufacturing and licensing costs, while branded Viagra may command a premium for name recognition and established quality assurance.

ProductStrengthPack SizeApprox. PriceStatus
Viagra (branded) 50 mg 4 tablets £32.00 POM
Generic sildenafil 50 mg 4 tablets £18.00 POM
Viagra Connect 50 mg 8 tablets £25.00 P

Strengths, formulations and pack types

Available strengths

Viagra tablets are supplied in 25 mg, 50 mg and 100 mg strengths. The usual starting dose is 50 mg, adjustable up or down based on efficacy and tolerability, with a maximum recommended dose of 100 mg once per day.

Gastro-resistant design

The film coating on Viagra tablets ensures protection from stomach acid so that sildenafil is released in the small intestine, where absorption is optimal.

Pack sizes and legal status

Branded Viagra is sold in packs of four or eight film-coated tablets. Generic sildenafil often uses similar pack sizes. Viagra Connect (P category) is supplied in packs of eight 50 mg tablets. Different pack sizes can affect ease of use, privacy and total cost.

Generic vs branded

Generic sildenafil contains exactly the same active ingredient at the stated strength and must meet the same regulatory standards as the branded product. Excipients may differ, and generic tablets can vary in colour, shape and packaging.

Erectile dysfunction and related conditions

What causes ED?

Erectile dysfunction can result from vascular problems (e.g. atherosclerosis), neurological disorders (e.g. spinal cord injury), metabolic diseases (e.g. diabetes), hormonal imbalances (e.g. low testosterone), psychological factors (e.g. stress, anxiety) or medication side effects.

Associated conditions

  • Cardiovascular disease
  • Diabetes mellitus
  • Hypogonadism
  • Neurological diseases
  • Depression and anxiety

When to seek medical advice

Persistent ED may indicate underlying health issues that warrant medical evaluation. Men experiencing sudden onset ED, pain during erection, or accompanying symptoms like discharge or fever should seek prompt medical attention.

UK legal classification: GSL, P and POM

Prescription Only Medicine (POM)

Most strengths of sildenafil (25 mg, 100 mg) and branded Viagra (all strengths) remain POM, requiring a prescription from a doctor or a valid online consultation with an appropriate prescriber.

Pharmacy medicine (P)

Viagra Connect (sildenafil 50 mg) is classified as a Pharmacy medicine, allowing qualified pharmacists to supply without prescription following a screening questionnaire and consultation.

General Sales List (GSL)

There are currently no erectile dysfunction medications classified as GSL. All require either prescription or pharmacy supervision.

Regulatory authority

The Medicines and Healthcare products Regulatory Agency (MHRA) oversees classification, licensing and safety monitoring of medicines in the UK. Changes in legal status are made through MHRA approval processes.

Alternatives for erectile dysfunction

Other PDE5 inhibitors

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

Non-pharmacological approaches

Lifestyle modifications such as weight management, smoking cessation, exercise, stress reduction and management of coexisting medical conditions can improve erectile function.

Devices and therapies

Vacuum erection devices, penile implants and intraurethral alprostadil may be considered for men who do not respond to oral treatments or have contraindications.

Viagra compared with other PDE5 inhibitors

FeatureSildenafil (Viagra)Tadalafil (Cialis)Vardenafil (Levitra)
Onset 30–60 minutes 30 minutes 30–60 minutes
Duration 4–6 hours Up to 36 hours 4–5 hours
Food effect High-fat delays absorption Minimal effect Less affected by food
Daily dosing No Optional (2.5–5 mg daily) No

Choosing a PDE5 inhibitor

Choice depends on lifestyle, dosing flexibility, duration of action, side effects and individual response. A healthcare professional can guide selection based on each patient’s needs.

Food, alcohol and lifestyle considerations

Food and timing

A high-fat meal can delay the absorption of sildenafil by 60 minutes or more. It is advisable to take the tablet on an empty stomach or after a light meal for faster onset.

Alcohol

Moderate alcohol consumption may not significantly affect sildenafil’s efficacy, but excessive drinking can impair erectile function and increase side effects such as dizziness and headache.

Smoking and cardiovascular health

Smoking is associated with vascular disease, which can worsen ED. Quitting smoking is beneficial for overall cardiovascular health and may improve treatment outcomes.

Exercise and weight management

Regular physical activity and maintaining a healthy weight support cardiovascular function and improve erectile performance, potentially reducing the need for higher doses of medication.

Side effects and tolerability

Common side effects

  • Headache
  • Flushing
  • Indigestion
  • Nasal congestion
  • Dizziness
  • Visual disturbances (e.g. blue tinge)

Less common effects

Back pain, muscle aches and gastrointestinal discomfort can occur but generally resolve within 24 hours.

Serious adverse events

Priapism (erection lasting >4 hours) is a medical emergency requiring prompt treatment to avoid permanent damage. Sudden visual or hearing loss, severe hypotension or cardiac events are rare but serious and need immediate medical attention.

Tolerance and discontinuation

Sildenafil does not cause physical dependence. If side effects are troublesome, dose adjustment or switching to another PDE5 inhibitor may be appropriate under medical guidance.

Long-term use and excessive exposure

Recommended dosing frequency

Sildenafil should be used no more than once per day. Exceeding the maximum recommended dose or frequency increases the risk of adverse reactions without proven additional benefit.

Chronic ED management

Men with ongoing ED may require periodic review to assess cardiovascular risk factors, psychological health, and the potential need for alternative treatments if sildenafil becomes less effective or is not tolerated.

Assessment of persistent symptoms

Recurrent ED may signal underlying disease progression in diabetes, hypertension or vascular conditions. Regular health checks and specialist referrals may be necessary for comprehensive care.

Medication review

Periodic review by a healthcare professional can ensure that sildenafil use remains appropriate, evaluate interactions with new medications, and consider dose adjustments as clinical circumstances change.

Warnings, contraindications and interactions

Contraindications

  • Concurrent nitrate therapy (e.g. isosorbide mononitrate)
  • Severe cardiovascular disease (e.g. recent myocardial infarction, unstable angina)
  • Hypotension (BP <90/50 mmHg)
  • Uncontrolled hypertension
  • Retinitis pigmentosa or known hereditary retinal disorders

Drug interactions

Sildenafil is metabolised by CYP3A4; strong inhibitors (e.g. ketoconazole, ritonavir) can increase sildenafil levels, requiring dose reduction. Alpha-blockers and antihypertensives may lead to symptomatic hypotension when combined with sildenafil.

Nitrates and risk

The combination of sildenafil with nitrates can cause profound and potentially life-threatening hypotension. Nitrates must not be taken within 24 hours before or after sildenafil.

Alcohol and other depressants

Excessive alcohol or use of other central nervous system depressants may exacerbate dizziness, hypotension and visual disturbance when taking sildenafil.

Special populations

Elderly men may require lower starting doses. Men with renal or hepatic impairment should use sildenafil cautiously, with dose adjustment in moderate to severe dysfunction.

Additional information about Viagra

What does “generic sildenafil” mean?

A generic medicine contains the same active ingredient as the reference (branded) product and must demonstrate bioequivalence through regulatory testing. Generic sildenafil tablets meet the same standards for quality, safety and efficacy as branded Viagra.

Why do different products have different leaflets?

Each authorised product has a Summary of Product Characteristics and patient leaflet specific to its manufacturer, excipients, pack sizes, approved indications and legal classification. Always read the leaflet supplied with your medicine.

Storage instructions

Store tablets in a cool, dry place away from direct sunlight. Keep out of reach of children. Do not use after the expiry date printed on the pack.

Verifying UK medicine information

Authoritative sources include the MHRA website, the electronic Medicines Compendium (eMC) and product information provided with the medicine. Pharmacists can also provide up-to-date guidance.

Does this information replace professional advice?

No. This page is provided by Clinical Care Pharmacy, Unit 4 Brian Clough Business Centre, 200-222 Cotton Lane, Derby, for general information only. For personalised advice or a prescription, please speak to our pharmacy team or your healthcare provider.