Sildenafil BNF - Cheapest UK Price From £0.45

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Sildenafil BNF - Cheapest UK Price From £0.45

Get sildenafil at the cheapest UK price from £0.45 with 20% off first orders using code Ednew.

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Sildenafil - UK-licensed prescription Treatment
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Sildenafil

From £0.45

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Tadalafil - UK-licensed prescription Treatment
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Tadalafil

From £9.99

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Sildenafil Eropid - UK-licensed prescription Treatment
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Sildenafil Eropid

From £8.99

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Tadalafil (Teva) - UK-licensed prescription Treatment
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Tadalafil (Teva)

From £9.99

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Avarante Tablets Tadalafil Tablets 10mg - UK-licensed prescription Treatment
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Avarante Tablets Tadalafil Tablets 10mg

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Viagra Connect 50mg - UK-licensed prescription Treatment
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Sildenafil BNF: Complete UK Prescribing & Dosing Guide

Understanding sildenafil BNF guidance is essential for safe, effective treatment of erectile dysfunction in the UK. As a phosphodiesterase type-5 inhibitor licensed by the MHRA, sildenafil follows specific British National Formulary protocols for dosing, contraindications, and patient assessment. At Cured Pharmacy, our UK-registered clinical team applies BNF standards to every prescription, ensuring you receive evidence-based treatment at £0.45 per tablet following online consultation.

What Is Sildenafil BNF Guidance?

The sildenafil BNF entry provides comprehensive prescribing information for UK healthcare professionals, detailing licensed indications, dosage regimens, contraindications, and drug interactions. According to BNF protocols, sildenafil is indicated for erectile dysfunction in adult men, with initial dosing typically starting at 50mg taken approximately one hour before sexual activity [1]. The BNF emphasises that sildenafil requires sexual stimulation to be effective and should not be used more than once daily.

Our superintendent pharmacist Tarun Kumar (GPhC 2233073) ensures all sildenafil prescriptions at Cured Pharmacy align with current BNF recommendations. This includes verifying patient suitability through structured clinical assessment, checking for contraindicated medications such as nitrates, and confirming appropriate dosing based on individual response and tolerability [2]. BNF guidance also specifies dose adjustments for patients with hepatic or renal impairment, which our prescribers evaluate during consultation.

Sildenafil BNF Dosing Recommendations

The sildenafil BNF dosing schedule begins with 50mg as the standard starting dose for most adult men, taken approximately 60 minutes before anticipated sexual activity. Based on efficacy and tolerability, the BNF permits dose adjustment to a maximum of 100mg or reduction to 25mg [1]. For elderly patients or those with moderate hepatic impairment, the BNF recommends initiating treatment at 25mg to minimise adverse effects.

Clinical trials referenced in BNF monographs demonstrate that sildenafil 50mg produces satisfactory erections in approximately 74% of men with erectile dysfunction, with higher success rates at 100mg [3]. At Cured Pharmacy, our prescribers follow these BNF protocols precisely, tailoring dosage to individual patient factors including age, comorbidities, and concurrent medications. All dosing decisions are made by UK-registered prescribers following comprehensive online assessment.

Sildenafil BNF Maximum Dose and Frequency

The BNF clearly states that the maximum recommended sildenafil dose is 100mg per day, with no more than one dose taken within any 24-hour period. This frequency limitation is critical for safety, as exceeding recommended dosing increases the risk of adverse effects including hypotension, visual disturbances, and priapism [2]. Our clinical team at Cured Pharmacy reinforces these BNF guidelines during every patient consultation, ensuring safe prescribing practices aligned with MHRA licensing.

Sildenafil BNF Contraindications and Cautions

The sildenafil BNF entry lists absolute contraindications including concurrent use of nitrate medications, severe cardiovascular disease, recent stroke or myocardial infarction, and hereditary degenerative retinal disorders [1]. These contraindications exist because sildenafil's vasodilatory effects can precipitate dangerous hypotension when combined with nitrates, and may pose cardiovascular risks in patients with unstable cardiac conditions.

BNF cautions also apply to patients with anatomical penile deformities, conditions predisposing to priapism (such as sickle cell anaemia or leukaemia), and those taking alpha-blockers for prostatic hyperplasia. Our prescribers at Cured Pharmacy systematically screen for these BNF-listed contraindications during online assessment, declining prescriptions where clinical risk outweighs benefit. This rigorous approach ensures patient safety whilst maintaining accessibility to treatment for suitable candidates.

Sildenafil BNF Drug Interactions

The BNF documents significant drug interactions with sildenafil, most critically with nitrates and nicorandil, which are absolute contraindications due to severe hypotension risk [2]. Interactions also occur with CYP3A4 inhibitors including ketoconazole, ritonavir, and erythromycin, which increase sildenafil plasma concentrations and may necessitate dose reduction to 25mg according to BNF guidance. Alpha-blockers require careful timing, with BNF recommending stable alpha-blocker therapy before initiating sildenafil at the lowest dose.

Treatment Type Frequency Starting Price
Sildenafil PDE5 Inhibitor As needed (max once daily) from £0.45
Tadalafil PDE5 Inhibitor As needed or daily from £9.99
Sildenafil Eropid PDE5 Inhibitor (branded) As needed (max once daily) from £8.99
Tadalafil (Teva) PDE5 Inhibitor (branded) As needed or daily from £9.99
Viagra Connect 50mg PDE5 Inhibitor (branded) As needed (max once daily) from £11.49
Cialis (Tadalafil) PDE5 Inhibitor (branded) As needed or daily from £53.00

Sildenafil BNF Side Effects Profile

The sildenafil BNF monograph details common adverse effects occurring in more than 10% of patients, including headache, flushing, dyspepsia, and nasal congestion [3]. These effects result from sildenafil's vasodilatory mechanism and typically resolve within hours. Less common but clinically significant side effects listed in the BNF include visual disturbances (blue tinge to vision, increased light sensitivity), dizziness, and palpitations.

Rare but serious adverse effects documented in BNF guidance include priapism (erection lasting over four hours), sudden vision loss due to non-arteritic anterior ischaemic optic neuropathy, and sudden hearing loss [2]. The BNF advises patients to seek immediate medical attention if priapism occurs, as permanent erectile tissue damage may result without prompt treatment. At Cured Pharmacy, we provide comprehensive safety information with every sildenafil prescription, ensuring patients recognise warning signs requiring urgent medical review.

Sildenafil BNF Clinical Efficacy Evidence

The sildenafil BNF entry references extensive clinical trial data demonstrating efficacy across diverse erectile dysfunction aetiologies. Pivotal trials showed that 62-82% of men achieved erections sufficient for intercourse with sildenafil compared to 25% with placebo [3]. These trials, which inform BNF recommendations, included men with diabetes, spinal cord injury, and post-prostatectomy erectile dysfunction, demonstrating broad applicability.

BNF guidance notes that sildenafil effectiveness requires sexual stimulation and does not increase libido or spontaneous erections. Average onset of action is 30-60 minutes, with duration of effect up to four hours, though this varies individually [1]. Our prescribers at Cured Pharmacy counsel patients on realistic expectations based on this BNF-referenced evidence, emphasising that sildenafil facilitates but does not guarantee erections, and works best as part of comprehensive sexual health management.

Sildenafil BNF Comparison with Other PDE5 Inhibitors

The BNF provides comparative information on sildenafil versus other phosphodiesterase type-5 inhibitors including tadalafil and vardenafil. Sildenafil's shorter duration of action (4 hours) contrasts with tadalafil's 36-hour window, offering different suitability depending on patient lifestyle and preference [2]. All three agents show similar efficacy rates in BNF-cited trials, with choice often determined by tolerability, cost, and desired spontaneity of use.

Accessing Sildenafil BNF-Compliant Prescriptions at Cured Pharmacy

At Cured Pharmacy (GPhC 9012511), every sildenafil prescription follows rigorous BNF protocols through our UK-registered prescriber assessment. Our online consultation takes under three minutes, systematically evaluating BNF contraindications, drug interactions, and patient suitability before any prescription is issued. This ensures you receive sildenafil only when clinically appropriate, with dosing aligned to BNF recommendations and your individual health profile.

We offer sildenafil at £0.45 per tablet, the cheapest UK price, with transparent pricing shown before consultation. Save 20% on your first order with code Ednew, and benefit from discreet packaging, next-day delivery, and ongoing support from our clinical team. All medicines are UK-licensed and dispensed by our registered pharmacy team, guaranteeing genuine medication that meets MHRA standards. Start your free online assessment today to access BNF-compliant sildenafil treatment with confidence.

Why Choose Cured Pharmacy for Sildenafil BNF Treatment

Choosing Cured Pharmacy means accessing sildenafil through a fully regulated UK pharmacy that prioritises clinical safety and BNF adherence. Our superintendent pharmacist Tarun Kumar oversees every prescription, ensuring compliance with national formulary guidance and MHRA licensing requirements. We combine lowest UK pricing with highest clinical standards, making evidence-based erectile dysfunction treatment accessible and affordable without compromising on safety or quality.

Scientific References

  1. British National Formulary. (2024). Sildenafil. BMJ Group and Pharmaceutical Press.
  2. Medicines and Healthcare products Regulatory Agency. (2023). Sildenafil: Drug Safety Update. MHRA.
  3. Goldstein, I., Lue, T. F., Padma-Nathan, H., Rosen, R. C., Steers, W. D., & Wicker, P. A. (1998). Oral sildenafil in the treatment of erectile dysfunction. New England Journal of Medicine, 338(20), 1397-1404.

Information on this page is for educational purposes only and is not medical advice. All prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting any new medication.

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Faq

What does the sildenafil BNF entry tell prescribers?
The sildenafil BNF entry provides comprehensive prescribing guidance including licensed indications, dosing schedules, contraindications, drug interactions, and adverse effects for UK healthcare professionals. It ensures standardised, evidence-based prescribing across the NHS and private sector.
What is the BNF recommended sildenafil starting dose?
The BNF recommends a sildenafil starting dose of 50mg for most adult men, taken approximately one hour before sexual activity. This can be adjusted to 100mg or reduced to 25mg based on efficacy and tolerability.
Does sildenafil BNF guidance cover drug interactions?
Yes, the sildenafil BNF monograph details critical drug interactions, particularly with nitrates (absolute contraindication), CYP3A4 inhibitors requiring dose reduction, and alpha-blockers requiring careful timing. Our prescribers screen for all BNF-listed interactions during assessment.
Can I get sildenafil following BNF protocols online?
Yes, Cured Pharmacy provides sildenafil prescriptions that fully comply with BNF guidance through online consultation with UK-registered prescribers. All assessments follow BNF protocols for contraindications, dosing, and patient suitability.
What are sildenafil BNF contraindications?
BNF contraindications for sildenafil include nitrate use, severe cardiovascular disease, recent stroke or myocardial infarction, hereditary retinal disorders, and severe hepatic impairment. Our prescribers systematically screen for these before issuing prescriptions.
How does sildenafil BNF dosing differ for elderly patients?
The BNF recommends considering a lower starting dose of 25mg sildenafil for elderly patients to minimise adverse effects, with dose adjustment based on individual response and tolerability.
Are sildenafil BNF side effects common?
The BNF lists headache, flushing, dyspepsia, and nasal congestion as common sildenafil side effects occurring in over 10% of patients. These typically resolve within hours and reflect the medication's vasodilatory mechanism.
What is the cheapest UK price for BNF-compliant sildenafil?
Cured Pharmacy offers sildenafil at £0.45 per tablet, the cheapest UK price, with all prescriptions following strict BNF protocols. Save 20% on your first order with code Ednew.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Last reviewed: 1 August 2026