Tadalafil (generic Cialis) is a prescription only medication used for the treatment of erectile dysfunction. It is effective for up to 36 hours after taking it.

4 pack of tadalafil 10mg film-coated oral tablets
Packet containing eight 20mg film-coated tablets of Tadalafil
Blister pack of four yellow Tadalafil tablets
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Prices from £19.00

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2.5 mg

28 tablet(s) - £29.00

56 tablet(s) - £55.00

5 mg

28 tablet(s) - £29.00

56 tablet(s) - £55.00

10 mg

4 tablet(s) - £19.00

8 tablet(s) - £29.00

12 tablet(s) - £39.00

16 tablet(s) - £49.00

20 mg

4 tablet(s) - £19.00

8 tablet(s) - £29.00

12 tablet(s) - £39.00

16 tablet(s) - £49.00

What is tadalafil?

Tadalafil is a medication used for the treatment of erectile dysfunction (ED). ED is when you find it difficult to get and maintain an erection during sex.

Taking tadalafil before having sex will help you to get and keep an erection. You must be sexually stimulated for tadalafil to work.

Remember that tadalafil will not protect you against sexually transmitted infections (STIs). You can avoid STIs by practising safe sex, including using condoms. If you need more information, talk to your healthcare professional.

How does tadalafil work?

Tadalafil is a phosphodiesterase type 5 inhibitor. When you are sexually aroused, the blood vessels in the penis expand, allowing more blood in. This causes an erection.

If you have erectile dysfunction, this reaction may not last long enough.

Tadalafil works by relaxing your blood vessels which then increases blood flow into your penis.

This makes it easier to get and maintain an erection. You need to be sexually stimulated for tadalafil to work, so it might be helpful to engage in foreplay with your partner before taking tadalafil.

How to take tadalafil

To take tadalafil:

  • the usual starting dose is one 10mg tablet
  • swallow one tablet with water at least 30 minutes before having sex
  • make sure you’re sexually stimulated when you take tadalafil

If the effect of the 10mg tablet is not strong enough, speak to your doctor and they may give you 20mg tablets instead.

Avoid drinking lots of alcohol as this can make tadalafil less effective when you take it.

You should also avoid drinking grapefruit juice when taking tadalafil as this can interfere with how it works.

It’s important that you do not take more than one tadalafil tablet a day. If you take too much tadalafil, please get in touch with your doctor straight away. You may experience side effects if you take too much tadalafil.

For more information, you can read the patient information leaflet.

How effective is tadalafil?

Tadalafil can be effective for up to 36 hours after taking it.

If you’re taking the 10mg dose and find it’s not effective enough, speak to your doctor. A 20mg dose is available, which you can be prescribed.

It’s important to remember tadalafil will only be effective with sexual stimulation.

Medically reviewed by:
Dr Babak Ashrafi Clinical Lead for Service Expansion

Babak studied medicine at King’s College London and graduated in 2003, having also gained a bachelor’s degree in Physiology during his time there. He completed his general practice (GP) training in East London, where he worked for a number of years as a partner at a large inner-city GP practice. He completed the Royal College of GPs membership exam in 2007.

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Last reviewed: 17 Feb 2022

ZAVA offers a convenient and discreet service to help men improve their erectile dysfunction. There are a number of treatments you can consider. Continue to our erectile dysfunction service page to learn about the treatment options available.

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