(Erectile dysfunction treatment)

Sildenafil is our most popular clinically proven treatment for erectile dysfunction. It contains the same active ingredient as branded alternatives (but comes at a lower price because you aren’t paying for the brand name) and works by allowing more blood to flow into the penis - ensuring a strong erection when you need one.

Takes effect in
1 hour
Lasts up to
4 hours
How well it works
78% of men have experienced improved erections after taking sildenafil
Prices start from
£4.25 / tablet

Our promise

If you’re new to Numan, here's how we do things.


We’re regulated by the Care Quality Commission.


Our team of clinicians and health experts can support you along every step of your treatment journey.


All our deliveries are free, discreet and fast.

Sildenafil: the science

  1. When you get aroused, your body produces a molecule called cGMP which helps to stimulate an erection by increasing blood flow to the penis.
  2. However, an enzyme known as PDE5 normally breaks cGMP down. This restricts blood flow to the penis and causes the erection to subside.
  3. Sildenafil blocks the action of PDE5, allowing more blood to flow into the penis. The resulting erection is firmer and usually lasts long enough to allow for satisfying sex.

How Numan works

It’s healthcare without the hassle.

Free online consultation

Once complete, your consultation will be reviewed by our clinicians. Most prescriptions are approved the same day.

Free, discreet, speedy delivery

Free, discreet, speedy delivery

If your treatment is approved, it’ll be dispatched to you discreetly within 24 hours.

Continuous care

Have any questions or want to change your medication? Speak to our clinicians and they’ll be able to help.

Cancel anytime

If you’re not happy with the service, or simply don’t need treatment anymore, you can cancel anytime.

Sildenafil: facts you need to know

Straightforward answers to frequently asked questions.

Tackle erectile dysfunction