Best Erectile Dysfunction Pills in the UK

Whether you're 25 or 65, erectile dysfunction (ED) can knock your confidence. But effective treatments do exist.

Let's explore the best erectile dysfunction pills available in the UK and how they can help you get your spark back in the bedroom.

Three key takeaways

  • Erectile dysfunction pills work by improving blood flow to the penis, with most taking 30-60 minutes to kick in.
  • How long each pill lasts varies between medications, from 4-5 hours to 24-36 hours.
  • Several ED treatments are now available over the counter, including Viagra Connect and Cialis Together.

Best erection pills at a glance

Active IngredientProduct NameAvailabilityHow quickly does it work?How long does it last?  
Sildenafil - widest availabilitySildenafilPrescription-only30-60 mins4-5 hours
ViagraPrescription-only30-60 mins4-5 hours
Viagra ConnectOver-the-counter (OTC)30-60 mins4-5 hours
NoxtioOTC30-60 mins4-5 hours
LiberizeOTC30-60 mins4-5 hours
AlmusOTC30-60 mins4-5 hours
Tadalafil – longest-lastingTadalafilPrescription-only30-60 mins24-36 hours
CialisPrescription-only30-60 mins24-36 hours
Cialis TogetherOTC30-60 mins24-36 hours
StaynixOTC30-60 mins24-36 hours
AserbidoxOTC30-60 mins24-36 hours
Vardenafil – fewest side effectsVardenafilPrescription-only25-60 mins4-5 hours
LevitraPrescription-only25-60 mins4-5 hours
Avanafil – fastest-actingSpedraPrescription-only15-30 mins4-6 hours

What are the best erectile dysfunction pills in the UK?

The main medications used to treat erectile dysfunction are phosphodiesterase-5 (PDE-5) inhibitors. Medicines like Viagra work by helping to increase the blood flow to your penis during sex.

In the UK, there are four types of PDE-5 inhibitors available: sildenafil, tadalafil, vardenafil and avanafil.

Sildenafil (Viagra, Aronix, Liberize, Almus): widest availability

Sildenafil is the most widely available ED pill on the market, due to it being the main ingredient in Viagra. It’s also available as a generic drug, and is the active ingredient in Aronix, Liberize and Almus.

It takes between 30-60 minutes to work and typically lasts between 4-5 hours. You can take any pill containing sildenafil up to four hours before you want to have sex.

Sildenafil tablets come in different doses ranging from 25mg to 100mg, though the usual dose is 50mg, including over-the-counter Viagra Connect.

Sildenafil can cause side effects, though these don’t normally affect people taking it for ED, as you’re only taking it for a short time. Sildenafil side effects can include:

  • headaches
  • nausea
  • hot flushes
  • indigestion
  • blocked nose
  • dizziness

Tadalafil (Cialis, Stamiz, Avarante): longest lasting

If you’re looking for something that’ll allow you a bit more freedom, then you could consider tadalafil.

It’s the longest-lasting ED pill available, staying in your system for between 24-36 hours. This bigger window of opportunity means you can be more spontaneous in the bedroom.

Tadalafil is the active ingredient in Cialis, Stamiz and Avarante, and can be bought over the counter as Cialis Together. There are four doses of tadalafil available: 2.5mg, 5mg, 10mg and 20mg tablets, though the usual dose is 10mg.

Common tadalafil side effects can include:

  • headaches
  • nausea
  • hot flushes
  • indigestion
  • blocked nose
  • muscle aches

Vardenafil (Levitra): fewest side effects

Although most people don’t experience side effects when taking ED medication, it still may be a concern. If that’s true for you, then you could consider vardenafil.

That’s because vardenafil is more potent, and more selective, then alternative treatments, meaning a lower dose may be required. And a lower dose typically means fewer side effects.

Vardenafil comes as 5mg, 10mg and 20mg tablets, though the usual dose is 10mg. You should not take more than one dose of vardenafil within 24 hours.

You should take vardenafil 25-60 minutes before you want to have sex. It can last for 4-5 hours.

Common vardenafil side effects can include:

  • headaches
  • hot flushes
  • indigestion
  • blocked nose
  • dizziness

Avanafil (Spedra): fastest acting

Avanafil, the active ingredient in Spedra, starts to work in as little as 15 minutes, and reaches maximum concentration within 30 to 45 minutes. This makes it the fastest-acting ED pill available in the UK.

Avanafil comes as 50mg, 100mg and 200mg tablets, though the usual dose is 100mg. You should not take more than one dose of avanafil within 24 hours.

Common avanafil side effects can include:

  • headaches
  • hot flushes
  • blocked nose

What are the best erectile dysfunction pills without side effects?

"Like any medication, taking erectile dysfunction pills may cause side effects. The good news is that most ED pills are well-tolerated.

"In fact, studies have actually shown that sildenafil and tadalafil are relatively safe, with only three in 10 people experiencing any adverse effects when taking the pills for erectile dysfunction.

"If you are affected by adverse effects there are alternatives like vardenafil, which may produce fewer side effects due to its greater selectiveness as a PDE-5 inhibitor.

"We always advise patients to speak to their pharmacist or their GP for more personalised advice surrounding ED medication."

Ian Budd, Prescribing Pharmacist at Chemist4U

How to choose the best erection pills for your needs

Choosing the right ED medication depends on your lifestyle and preferences. When comparing erectile dysfunction pills, consider:

  • How quickly it works: for example, Spedra is the fastest-acting pill in the UK, starting to work in as little as 15 minutes.
  • How long it lasts: the longer a pill stays in your system, the more time you have to get intimate. Tadalafil is the best erectile dysfunction pill for length, lasting 24-36 hours.
  • Side effects: it’s always important to compare side effects so you’re comfortable with the medication you choose.
  • Availability: while most ED pills require a prescription, you can buy Viagra Connect and Cialis Together online and over the counter immediately.  
  • Warnings and interactions: make sure that your chosen ED pill doesn’t interact with any medication you’re already taking, or any pre-existing conditions you might have.

How our expert clinical team can help

Our UK-registered clinicians and pharmacists are here to support you through every step of your ED treatment.

We offer online consultations where you can discuss your symptoms confidentially and receive expert recommendations on the most suitable treatment.

Our pharmacists can answer questions about dosage, timing, potential interactions with other medications, and any concerns about side effects.

Frequently asked questions about the best erection pills

Who should not take Viagra?

You should not take Viagra if:

  • you struggle with low blood pressure
  • you have recently had a stroke or heart attack
  • you have an allergy to the active ingredient sildenafil

How quickly do erection pills work?

On average, most erection pills will start working within 30 to 60 minutes. However, it is encouraged that you take most tablets roughly an hour before any sexual activity. Always speak to a pharmacist and consult the patient information leaflet if you are unsure.

Sources

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Ian Budd - Prescribing Pharmacist
Ian Budd , Prescribing Pharmacist on 09 December 2025
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