Sildenafil: Price, Pros & Cons in the UK
The most widely prescribed ED tablet in the UK, and by far the cheapest effective option.
Quick Facts
- ED — generic Viagra
- Typical cost: £10–£25/mo
- 21 providers currently offer this
- Content last reviewed 13 August 2026
This page provides general information, not medical advice — whether any treatment is right for you is a decision for a UK-registered prescriber after reviewing your individual history.
What it is
Sildenafil is the generic version of Viagra, taken as a tablet roughly 30–60 minutes before sex. It works by increasing blood flow to the penis, but only takes effect with sexual stimulation.
Pros and cons
Why it's good
- By far the cheapest effective ED tablet, from as little as 50p per tablet at some providers
- Extremely well-studied — works for around 70–74% of men who try it
- Takes effect within 30–60 minutes
- Medically identical to branded Viagra at a fraction of the price
Why it's not for everyone
- Effects last around 4 hours, shorter than tadalafil's up to 36 hours
- Taking it with a heavy or fatty meal can delay how quickly it works
- Common side effects include headaches, flushing and indigestion
- Not safe to combine with nitrate medicines (e.g. GTN spray) due to a dangerous drop in blood pressure
Who it's best for
Most men trying ED treatment for the first time — it's the standard starting point most UK prescribers reach for, and by far the most cost-effective.
Typical cost
Providers offering this
- Numan
- Voy (formerly Manual)
- ZAVA
- Asda Online Doctor
- Boots Online Doctor
- LloydsPharmacy Online Doctor
- Superdrug Online Doctor
- iQ Doctor
- Dr Fox
- Pharmacy2U
- Simple Online Pharmacy
- Ashcroft Pharmacy
- Chemist4U
- Medino
- PPRX
- Oxford Online Pharmacy
- The Online Clinic
- Happy Pharmacy
- The Care Pharmacy
- The Independent Pharmacy
- Phlo Clinic
Frequently asked questions
What is Sildenafil?
Sildenafil is the generic version of Viagra, taken as a tablet roughly 30–60 minutes before sex. It works by increasing blood flow to the penis, but only takes effect with sexual stimulation.
How much does Sildenafil cost in the UK?
Sildenafil typically costs £10–£25/mo in the UK, though the exact price depends on dose and provider.
Who is Sildenafil best suited to?
Most men trying ED treatment for the first time — it's the standard starting point most UK prescribers reach for, and by far the most cost-effective.
Sources
- NHS website — medicines information.
- Electronic Medicines Compendium (emc) — Summary of Product Characteristics for the licensed product.
- Medicines and Healthcare products Regulatory Agency (MHRA) — UK licensing and safety information.
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See exactly which UK providers offer it, and at what price.
PickMyClinic is an independent comparison site, not a pharmacy or clinic. This page is not a personal recommendation and does not replace advice from a UK-registered prescriber. Some links on this site may be affiliate links; see our Affiliate Disclosure.