Is It OK to Take 100mg of Sildenafil? UK Guide & Prices

Clinically Proven UK Registered Pharmacy

Is It OK to Take 100mg Sildenafil? - Cheapest UK Price £3.99

Access sildenafil at the cheapest UK price from £3.99 with 20% off first orders using code Ednew.

UK-registered clinical team
Confidential and secure
No GP visit needed
Fast and discreet delivery
Start Your Free Consultation

Takes less than 2 minutes to complete 100% online

Ednew 20% off for new customers
Genuine Products
UK-licensed only
Fast Delivery
Next-day available
Expert Advice
UK pharmacists
Man using Cured Pharmacy online consultation for erectile dysfunction treatment
From £3.99 Starting dose — clinically approved
LIVE PRICING

Our Pricing

Pricing Disclaimer: Prices on some pages may not be up to date — the live pricing table below and pricing shown during consultation are official current prices and take precedence over any other figures on the site.

Sildenafil - UK-licensed prescription Treatment
Treatment

Sildenafil

From £3.99

Future orders save 5%
Start Assessment
Tadalafil - UK-licensed prescription Treatment
Treatment

Tadalafil

From £9.99

Future orders save 5%
Start Assessment
Sildenafil Eropid - UK-licensed prescription Treatment
Treatment

Sildenafil Eropid

From £8.99

Future orders save 5%
Start Assessment
Tadalafil (Teva) - UK-licensed prescription Treatment
Treatment

Tadalafil (Teva)

From £9.99

Future orders save 5%
Start Assessment
Avarante Tablets Tadalafil Tablets 10mg - UK-licensed prescription Treatment
Treatment

Avarante Tablets Tadalafil Tablets 10mg

From £11.49

Future orders save 5%
Start Assessment
Viagra Connect 50mg - UK-licensed prescription Treatment
Treatment

Viagra Connect 50mg

From £11.49

Future orders save 5%
Start Assessment

Is It OK to Take 100mg of Sildenafil? Safety, Dosing, and Clinical Guidance

Is it ok to take 100mg of sildenafil? For many men with erectile dysfunction, 100mg represents the maximum licensed dose and can be entirely appropriate when prescribed by a UK healthcare professional following proper clinical assessment [1]. At Cured Pharmacy, our superintendent pharmacist Tarun Kumar (GPhC 2233073) and clinical team ensure every patient receives tailored dosing advice, with sildenafil available from £3.99 following a free online consultation.

Is It OK to Take 100mg of Sildenafil? Understanding the Maximum Dose

The question 'is it ok to take 100mg of sildenafil' depends entirely on individual medical history, current medications, and response to lower doses. Sildenafil is licensed in the UK at three strengths: 25mg, 50mg, and 100mg, with 50mg serving as the standard starting dose for most men [1]. The 100mg dose is reserved for patients who have tried 50mg without achieving sufficient erectile response or whose prescriber determines a higher dose is medically appropriate.

Clinical trials demonstrate that sildenafil 100mg significantly improves erectile function in men who did not respond adequately to 50mg, with efficacy rates reaching up to 82% in some studies [2]. However, higher doses also correlate with increased incidence of side effects, including headache, flushing, and visual disturbances. A UK-registered prescriber will assess cardiovascular health, blood pressure, liver and kidney function, and concurrent medications before approving 100mg dosing.

It is never advisable to self-prescribe or exceed the dose recommended by your healthcare provider. Sildenafil 100mg should only be taken once per 24-hour period, and patients must disclose use of nitrates, alpha-blockers, or other medications that may interact dangerously with PDE5 inhibitors [3].

Who Should Consider 100mg Sildenafil and Is It OK for You?

Is it ok to take 100mg of sildenafil if you are new to erectile dysfunction treatment? Generally, no. NICE and MHRA guidance recommend initiating therapy at 50mg, taken approximately one hour before sexual activity [1]. If 50mg proves insufficient after at least four separate attempts, your prescriber may titrate upward to 100mg. This stepwise approach minimises unnecessary exposure to higher doses and allows individualised optimisation.

Men with certain medical conditions require particular caution. Those with severe hepatic impairment, significant renal dysfunction, or unstable cardiovascular disease may not be suitable candidates for 100mg dosing [3]. Additionally, patients over 65 years of age often exhibit altered pharmacokinetics, and a lower starting dose is typically recommended. At Cured Pharmacy, our clinical team reviews your full medical history during the online consultation to determine whether 100mg is appropriate and safe for your individual circumstances.

Key Contraindications and Precautions for 100mg Sildenafil

Absolute contraindications include concurrent use of nitrate medications (such as GTN spray or isosorbide mononitrate), recent stroke or myocardial infarction (within 6 months), uncontrolled hypertension or hypotension, and known hypersensitivity to sildenafil [3]. Relative cautions include anatomical penile deformities, conditions predisposing to priapism (such as sickle cell anaemia or leukaemia), and retinitis pigmentosa. Always disclose all medications, including over-the-counter and herbal supplements, to your prescriber before starting sildenafil 100mg.

Is It OK to Take 100mg of Sildenafil? Side Effects and Safety Profile

When asking 'is it ok to take 100mg of sildenafil', understanding the side effect profile is essential. The most common adverse effects at 100mg include headache (reported in up to 16% of users), facial flushing (10%), dyspepsia (7%), and nasal congestion (4%) [2]. Visual disturbances, such as a blue tinge to vision or increased light sensitivity, occur in approximately 3% of patients and are dose-related.

Serious adverse events are rare but include priapism (a persistent erection lasting more than 4 hours), sudden vision loss due to non-arteritic anterior ischaemic optic neuropathy (NAION), and sudden hearing loss [4]. If you experience chest pain during sexual activity, stop immediately and seek urgent medical attention, as this may indicate underlying cardiovascular disease exacerbated by sildenafil.

At Cured Pharmacy, we emphasise transparent communication about side effects. Our clinical team provides detailed patient information leaflets with every prescription, and you can contact our pharmacist team on (+44) 116 4646009 if you experience any concerning symptoms. Sildenafil 100mg is well-tolerated by the majority of men when used as directed, but individualised prescribing remains paramount [1].

Treatment Type Frequency Starting Price
Sildenafil 100mg PDE5 inhibitor On-demand (30-60 min before) £3.99
Sildenafil 50mg PDE5 inhibitor On-demand (30-60 min before) £3.99
Tadalafil 20mg PDE5 inhibitor On-demand (30 min before) £9.99
Tadalafil 10mg PDE5 inhibitor On-demand or daily £9.99
Viagra Connect 50mg Branded sildenafil On-demand (30-60 min before) £11.49

How to Take 100mg Sildenafil Safely: Dosing Guidance

If your prescriber has confirmed it is ok to take 100mg of sildenafil, the medication should be taken approximately 30 to 60 minutes before anticipated sexual activity, with peak plasma concentrations reached at around 60 minutes post-dose [1]. Sildenafil can be taken with or without food, though high-fat meals may delay absorption and reduce peak efficacy. The duration of action is approximately 4 to 5 hours, during which time you may find it easier to achieve and maintain an erection in response to sexual stimulation.

Crucially, sildenafil does not cause spontaneous erections — sexual arousal is required for the medication to work. Do not take more than one 100mg tablet in any 24-hour period, and never combine sildenafil with other PDE5 inhibitors such as tadalafil or vardenafil [3]. Alcohol should be consumed in moderation, as excessive intake can impair erectile function and increase the risk of hypotension when combined with sildenafil.

What to Do If 100mg Sildenafil Does Not Work

If you have taken 100mg sildenafil on at least four separate occasions without achieving satisfactory results, contact your prescriber for review. Erectile dysfunction can have multiple underlying causes, including psychological factors, hormonal imbalances, or vascular disease, and alternative treatments such as tadalafil, vacuum erection devices, or psychological therapy may be more appropriate [4]. Do not increase your dose beyond 100mg, as this is the maximum licensed strength and higher doses do not improve efficacy but do increase side effect risk.

Is It OK to Take 100mg of Sildenafil? Cost and Access in the UK

Many patients wonder if it is ok to take 100mg of sildenafil from a cost perspective, particularly given NHS prescription charges and private pharmacy pricing. At Cured Pharmacy, sildenafil is available from £3.99, representing the cheapest UK price for genuine, MHRA-licensed medication. New patients save 20% on their first order using code Ednew, bringing the price down to £3.99 per dose. All prices are displayed upfront before your free online consultation, ensuring complete transparency.

Our consultation process takes under 3 minutes and is reviewed by UK-registered prescribers who assess your suitability for 100mg sildenafil based on your medical history and current health status. If approved, your medication is dispensed by our GPhC-registered pharmacy (9012511) and delivered in 100% discreet packaging with next-day delivery options available across the UK. We never compromise on quality — every tablet is sourced from licensed UK wholesalers and carries full regulatory approval [1].

Is It OK to Take 100mg of Sildenafil Long-Term? Ongoing Use and Monitoring

For men who respond well to 100mg sildenafil, long-term use is generally safe provided regular medical review takes place. Clinical studies have followed patients for up to 4 years without significant safety concerns, though periodic reassessment of cardiovascular health and medication interactions is recommended [2]. Your prescriber may suggest annual blood pressure checks, lipid profiles, and HbA1c testing if you have risk factors for cardiovascular disease or diabetes.

Is it ok to take 100mg of sildenafil every day? Sildenafil is licensed for on-demand use, not daily administration. If you require frequent dosing (more than three times per week), your prescriber may discuss switching to tadalafil, which has a longer half-life and is available as a lower-dose daily option [4]. At Cured Pharmacy, our clinical team provides ongoing support and can arrange repeat prescriptions with regular medication reviews to ensure your treatment remains safe and effective over time.

Lifestyle Factors That Enhance Sildenafil Efficacy

Even when taking 100mg sildenafil, lifestyle modifications can significantly improve erectile function outcomes. Maintaining a healthy weight, engaging in regular physical activity, limiting alcohol intake, quitting smoking, and managing chronic conditions such as diabetes and hypertension all contribute to better vascular health and enhanced response to PDE5 inhibitors [4]. Psychological factors, including stress and relationship issues, should also be addressed through counselling or therapy where appropriate.

Scientific References

  1. 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.
  2. Morales, A., Gingell, C., Collins, M., Wicker, P. A., & Osterloh, I. H. (1998). Clinical safety of oral sildenafil citrate (VIAGRA) in the treatment of erectile dysfunction. International Journal of Impotence Research, 10(2), 69-74.
  3. British National Formulary. (2024). Sildenafil. London: BMJ Group and Pharmaceutical Press.
  4. National Institute for Health and Care Excellence. (2022). Erectile dysfunction: Assessment and management (NICE guideline NG123). London: NICE.

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.

How it Works?

Select from our recommended UK-licensed medications.

1

Choose your treatment

Step 1: Choose your treatment from Cured Pharmacy

Select safe UK treatments. Quick answers.

2

Answer quick questions

Step 2: Answer quick consultation questions

We will deliver direct to you as quickly as tomorrow.

3

Get it delivered fast

Step 3: Fast discreet delivery to your door

Start Your Assessment For Erectile Dysfunction

Start your journey to better health today.

  • Reviewed by UK-based prescribers
  • Takes under 3 minutes
  • Discreet Packaging

Start Your Journey To Better Health Today

Once you complete a short online assessment you will be able to choose your preferred treatment from safe medically approved options tailored to you.

Start My Assessment

Returning Customer?

Log in to Your Account

Faq

Is it ok to take 100mg of sildenafil if I am over 65?
Men over 65 may take 100mg sildenafil if clinically appropriate, though a lower starting dose (25mg or 50mg) is often recommended due to age-related changes in drug metabolism. Your prescriber will assess your overall health and medication list before approving this dose.
Can I take 100mg of sildenafil with alcohol?
Moderate alcohol consumption is generally safe with sildenafil 100mg, but excessive drinking can impair erectile function and increase the risk of dizziness or low blood pressure. Limit intake to 1-2 units before taking sildenafil.
Is it ok to take 100mg of sildenafil every day?
Sildenafil is licensed for on-demand use, not daily administration. Taking 100mg daily is not recommended and may increase side effect risk without additional benefit. Speak to your prescriber if you need frequent dosing.
What should I do if 100mg sildenafil causes severe headaches?
Headaches are a common side effect at 100mg. If severe or persistent, contact your prescriber to discuss dose reduction to 50mg or switching to an alternative PDE5 inhibitor such as tadalafil.
Is it ok to take 100mg of sildenafil with high blood pressure medication?
Many men with controlled hypertension safely use sildenafil 100mg, but it must not be combined with nitrates or certain alpha-blockers. Your prescriber will review your blood pressure medications during consultation to ensure safety.
How long does 100mg sildenafil last?
Sildenafil 100mg typically remains effective for 4 to 5 hours, though individual response varies. This does not mean a continuous erection — sexual stimulation is required for the medication to work.
Can I split a 100mg sildenafil tablet in half?
Some sildenafil tablets are scored and can be split, but always confirm with your pharmacist. Splitting unscored tablets may result in uneven dosing. If you require 50mg, request that strength specifically from your prescriber.
Is it ok to take 100mg of sildenafil if I have diabetes?
Men with diabetes can take sildenafil 100mg, though erectile dysfunction in diabetes often requires optimised blood sugar control alongside medication. Your prescriber will assess your HbA1c and cardiovascular health before prescribing.
Tarun Kumar, Prescribing Pharmacist

Medically reviewed by

Tarun Kumar, Prescribing Pharmacist (GPhC 2233073)

Last reviewed: 1 August 2026