Dr Catriona Maybury
Medical Director | MBChB, MRCP, PhD
GMC: 6130975
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- Medically equivalent to Viagra®
- Results in 30-60 minutes
- Effects can last for up to 6 hours
- UK registered pharmacy
- UK licensed treatments
- Trusted by over 1.5 million people
Sildenafil information
Sildenafil is the generic version of the Viagra®, the most well known treatment for erectile dysfunction (ED).
Sildenafil is an effective, modern medicine used to treat erectile dysfunction (ED). When you take Sildenafil you may be able to:
- Improve your ability to get and maintain an erection
- Be more confident in your ability to get and maintain an erection
- Be satisfied with the hardness of your erections
Sildenafil is effective at treating erectile dysfunction in the
majority of men (at least 80% of men). It may have less of an
effect with ED caused by psychological factors, and may not work
if taken alongside a heavy meal or other drugs. If you aren’t
getting the results you want please contact us.
Sildenafil is the active ingredient in Viagra®, and it’s also
available as a generic, unbranded tablet. Both treatments are
medically identical, but Viagra® costs more because of the
premium brand name.
Sildenafil can last up to 6 hours, with peak effects in 2
hours. This will depend on factors including your dosage and
your body’s metabolism.
Take one pill about an hour before you plan to have sex.
Swallow the tablet whole with water. It’s important to take it
without food, as the fat in your meal can make it less
effective. You should also avoid drinking too much alcohol, as
this can counteract the benefits. If you take any other
medications, check with your GP before taking sildenafil to make
sure they don’t interact with your pill.
Sildenafil is available in three doses: 50mg, 25mg and 100mg.
50mg
The starting dose usually recommended for men taking Sildenafil for the first time.
The starting dose usually recommended for men taking Sildenafil for the first time.
25mg
This is the recommended dose if you found 50mg effective, but experienced some side effects. It may also be prescribed if you’re over 65.
This is the recommended dose if you found 50mg effective, but experienced some side effects. It may also be prescribed if you’re over 65.
100mg
A high-strength dose used if you find 50mg isn’t effective enough, or your erection lasts less than 4 hours
A high-strength dose used if you find 50mg isn’t effective enough, or your erection lasts less than 4 hours
The most common side effects of Sildenafil are: headaches,
muscle aches, back pain, flushing and indigestion. In most
cases, these settle after an hour. Please speak with your GP or
pharmacist if you experience any side effects for a prolonged
period of time.
Always read the patient information leaflet before starting treatment.View patient information leaflet
45,000+ verified customer reviews
“5 stars”
Very easy to find the medication best suited to your needs by answering a few questions. Fast and discreet delivery.
“I’m over the moon”
The site is user friendly, easy to navigate, the discreet and professional treatment plans, and delivery never been late. Very...
“Excellent service, quick and discreet”
Works well for me. Has given my confidence back
“More like my younger self”
This has definitely made a difference to my life and with my treatment I am able to be more like my younger self, a heartfelt...
“Easy to use and fast shipping”
Great range including generic meds. Easy to use website and fast shipping. Useful guides and info too.
“I am so confident in MedExpress”
When l needed some help with ED problems l wasn’t really keen on speaking to my GP face to face and that’s when l found...
“It’s all been so easy”
Well I was pleasantly surprised at the simplicity of use and level of service, it’s all been so easy, they are as good as I could...
“Very good speedy service!”
The generic Viagra is a good replacement for the more expensive Viagra.
“So simple”
It’s so easy, you just answer a few questions, and hey presto you have what you need so simple. Thanks, MedExpress
“10/10”
Great prices and service. Delivered on time, every time. 10/10.
“Simply great prices, products and service”
I have been using MedExpress online pharmacy for several years. Mainly for ED products. Their standard prices have always been...
“What’s not to like?”
Excellent service all round, easy to use order system and next day delivery...what’s not to like?
“Five stars!”
Superpowers this Valentine’s Day 😈
“Effective product, excellent service”
Effective product without side effects with excellent service from MedExpress
“Recommended”
Good prices, communication and speed of delivery.
Sildenafil facts
- Time to feel the effect30–60 mins
- Effect lasts forUp to 6 hours
- Available strengths25mg, 50mg, 100mg
- Active ingredientSildenafil citrate
- Branded equivalent
How it works
1. Answer quick questions
No GP or pharmacy visits, just a quick online consultation.
1. Answer quick questions
No GP or pharmacy visits, just a quick online consultation. Share your symptoms and a brief medical history in around two minutes, all from the comfort of your home.
2. Choose your treatment
Select from our recommended UK-licensed medications.
2. Choose your treatment
Select from our recommended UK-licensed medications. You don’t need an existing prescription.
3. Get it delivered fast
We’ll deliver direct to you, as quickly as tomorrow.
3. Get it delivered fast
We’ll deliver direct to you, as quickly as tomorrow. We always use discreet logo-free packaging, so only you know what’s inside. After it arrives, get ongoing support from our team.
Express delivery
- Royal Mail 1st Class£2.90Usually delivered the next working day
- Special Delivery 1pm£5.95Guaranteed next working day by 1pm
- Special Delivery 9am£13.95Guaranteed next working day by 9am
- Post Office Collection£3.95Usually collection next working day
Why use MedExpress?
Trusted by more than 1.5 million customers since 2013
London based licenced pharmacy
Fast, flexible delivery options
Backed by our experienced UK-based medical team
Declan Lismore
Superintendent Pharmacist | MPharm, MRPharmS, MPSI, PGDip
GPhC: 2073498
Dr Paul Davis
Senior GP and Medical Lead | BSc MB BS DCH MRCGP
Dr Safia Hussain
GP Lead | MBBS, BSc, MRCGP, DRCOG, PGDip Clinical Dermatology
Sildenafil prices
Starting prices for all pack sizes.
Strengths available: 25mg, 50mg and 100mg
Quantity
Price from
4 tablets
£9.99£2.50 a tablet
8 tablets
£19.99£2.50 a tablet
12 tablets
£29.99£2.50 a tablet
16 tablets
£39.99£2.50 a tablet
24 tablets
£59.99£2.50 a tablet
28 tablets
£69.99£2.50 a tablet
32 tablets
£79.99£2.50 a tablet
64 tabletsSaves £69.85
£89.99£1.41 a tablet
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Authored by Dr Clare Morrison. Last reviewed 01 February 2025 by Liyya Patel and Siobhan Titre.