The active ingredient in Viagra®


Getting hard wasn’t always easy. Now it is. Sildenafil is the active ingredient in Viagra®, which is clinically approved in the UK to treat ED.

It improves blood flow to the penis by relaxing blood vessels and smooth muscle. The result is a harder and longer-lasting erection.

We offer this popular ED treatment at a fraction of the brand name price.

Choose your strength

Doses per month

Choose your delivery frequency

£24£14 for the first delivery

£24 per delivery thereafter

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Prescription products require an online consultation with a clinician who will determine if a prescription is appropriate. Important safety information.

Free online consultation

Free, discreet, next day delivery

Ongoing clinician support

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Sildenafil makes hard easy

Feel the urge

Sildenafil starts to work when you’re sexually aroused. So start by getting in the mood.

Take the pill

Sildenafil takes 30-60 minutes to work, with the sweet spot at the one-hour mark.

Enjoy the ride

Effects last for four hours, sometimes longer. Get ready for a great time with your partner.

A note from our sexual health expert

Erection difficulties are very common. 40% of men will experience ED by age 40. Fortunately, there are effective solutions available. Sildenafil is the most popular treatment for men with ED. It has been clinically proven to work for the vast majority of guys with ED.

Dr Peter Stahl

Men’s Sexual Health and Urology, Hims

How long does it last?

4 hours

How long to feel the effect?

60 minutes

Don't combine with

Nitrates, alcohol


Works for most guys; cost effective; most popular treatment

Not sure if Sildenafil is right for you?

Get professional medical guidance without in-person visits or long pharmacy queues.

A UK clinician will determine if treatment is appropriate for you.

What's Sildenafil?

Sildenafil (aka, sildenafil citrate) is proven to combat erectile dysfunction and help you get hard when the time is right. Sildenafil citrate is a well known PDE5 inhibitor that has been prescribed by doctors for the last 20 years, ever since Viagra® was first approved in 1998.

Order Sildenafil online

Hims offers access to genuine sildenafil online. Through our platform, you can get evaluated for ED treatment discreetly, skipping in-person conversations and physical trips to the pharmacy.

First, you'll be securely connected online to a UK clinician to evaluate you and answer any questions. If determined to be appropriate by the clinician, you can be prescribed sildenafil, tadalafil or other prescription ED drugs, which will be delivered right to your door at a pace that suits you. Ongoing adjustments are made simple by contacting a clinician through our platform.

How to take Sildenafil

Typically sildenafil is recommended to be taken on an empty stomach about an hour before you plan to get busy, and you should be able to keep that erection strong for as long as it’s needed.

Sildenafil side effects

Some men experience a tingly feeling in their body, headaches, temporary visual symptoms and other side effects from sildenafil. Make sure to read all the important safety information that comes with your treatment. If you are experiencing side effects that are bothersome or persistent, use our platform to talk to a clinician who can recommend adjustments to your treatment.

Viagra® vs Sildenafil

The main difference is branding and price. Viagra® is a brand name medication invented by Pfizer, while sildenafil (or sildenafil citrate) is the active ingredient in Viagra® that’s responsible for its positive effects on treating erectile dysfunction.

ED medication that gets rave reviews.

4.6 out of 5

Based on 264 reviews

“My confidence has no doubt been boosted and I feel like I’m back in my 20’s again.”

Will S.

Verified Reviewer

“I'm more confident, happier and it has brought back a dynamic to my marriage that makes planning date nights exciting again.”

Matthew H.

Verified Reviewer

“Thanks to Hims, I feel like I’m 18 again and my relationship with my girlfriend has never been better...thanks Hims!”

Brandon T.

Verified Reviewer

Customer's results have not been independently verified. Individual results will vary. Customer was given free product for their time.

Our expert team

Meet the medical professionals helping us find easier, faster and safer erectile dysfunction treatments for men like you.

Dr Patrick Carroll

Board Member, Medical Advisor

Dr Leah S. Millheiser

Medical Affairs

Dr Peter J. Stahl

Men’s Sexual Health and Urology

Frequently asked questions about Sildenafil

Over 4.6 million consultations worldwide

  • All-online ED treatment

  • 80% cheaper generics, 100% as effective

  • Shipped in discreet packaging

*number of consultations in the UK and US since launch, Hims & Hers Health, Inc. as of Sept 2021