Erectile dysfunction

Erectile dysfunction is when men are unable to get or keep an erection suitable for sex. You can buy medication from Dr Fox Pharmacy by completing a short health assessment online.

Read medical information and answer medical questions to buy treatment online.

Erectile dysfunction medication


All medication supplied is UK licensed.

photo of Viagra Connect pack

Viagra Connect (sildenafil)

50mg from £1.31 per tablet

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photo of Viagra 50mg pack

Viagra (sildenafil)

25mg, 50mg, 100mg from £5 per tablet

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photo of 25mg, 50mg, 100mg packs of Sildenafil

Sildenafil (generic Viagra)

25mg, 50mg, 100mg from 71p per tablet

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photo of 10mg pack of Cialis

Cialis (tadalafil)

2.5mg, 5mg, 10mg, 20mg from £2.29 per tablet

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photo 10mg pack of Tadalafil

Tadalafil (generic Cialis)

2.5mg, 5mg, 10mg, 20mg from 50p per tablet

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photo 20mg pack of Levitra

Levitra (vardenafil)

5mg, 10mg, 20mg from £3.75 per tablet

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photo 20mg pack of Vardenafil

Vardenafil (generic Levitra)

5mg, 10mg, 20mg from £2.97 per tablet

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photo of 100mg pack of Spedra

Spedra (avanafil)

50mg, 100mg, 200mg from £3.10 per tablet

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Prices of ED treatment from Dr Fox (in stock)
Tablet type & dosagex4x8x16x32x64
Sildenafil 25mg£4.90£8.50£15.20£29.50£45.50
Sildenafil 50mg£6.50£11.90£23.00£44.00£60.95
Sildenafil 100mg£7.20£13.25£26.00£49.00
Viagra 25mg£24.20£44.30£82.00
Viagra Connect 50mg£17.50£33.50
Viagra 50mg£29.40£59.50£112.60
Viagra 100mg£33.80£64.45£124.40
Tadalafil 10mg£9.45£16.95£25.95£44.95
Tadalafil 20mg£9.95£17.95£28.95£54.95
Cialis 10mg£35.40£67.50£129.60
Cialis 20mg£36.20£68.80£133.20
Vardenafil 10mg£19.90£34.20£56.80
Vardenafil 20mg£25.50£48.00£84.00
Levitra 10mg£24.00£43.00£75.00
Levitra 20mg£28.00£53.00£105.00
Levitra Orodispersible 10mg£29.00£51.00
Spedra 50mg£16.50£28.00£49.50
Spedra 100mg£19.50£37.00£68.00
Spedra 200mg£29.50£54.50£98.00
Tablet type & dosage28 tablets56 tablets84 tablets
Daily Tadalafil 2.5mg£19.45£33.95£41.95
Daily Tadalafil 5mg£22.95£43.95£64.95
Daily Cialis 2.5mg£66.50£128.30
Daily Cialis 5mg£67.60£132.20

Prescription fees

Dr Fox supplies medicine on prescription and charges a small prescription fee based on the order value of each prescription.

Prescriptions are issued by our doctors online and sent electronically to our pharmacy.

Order valuePrescription fee
up to £10£1.00
up to £20£2.00
up to £40£3.00
over £40£4.00

If you have your own private or NHS paper prescription please post to our pharmacy (details).

Dr Fox prices are 25%–50% lower than other UK online clinics.

Delivery charges

UK delivery only: £2.90 per consultation via Royal Mail 24 Signed For (1-3 working days with tracking).

Parcel forwarding services are not permitted. Use only UK home or work delivery address.

Returns and refunds - unwanted items can be returned within 14 working days for a full refund.

Medical information

Written and reviewed by a team of doctors. Dr Fox is regulated by the CQC & GPhC.

About erectile dysfunction

Erectile dysfunction (ED) is common. It is not unusual for most men to have problems occasionally getting or maintaining an erection. This is usually caused by tiredness, stress, drinking too much alcohol, or anxiety. It is not usually caused by low hormone levels. Most men with erectile dysfunction are in reasonable health, although erectile dysfunction may be a symptom of poor circulation or early diabetes. Erectile dysfunction is more common in smokers and men who are overweight. Some medicines can contribute to ED as can many recreational and frequently abused drugs. Some men with ED have low testosterone levels. Cycling more than 3 hours a day can also lead to ED.

All men with persistent ED should tell their GPs about it.

ED treatments

Over the last few decades medications have revolutionised the treatment of erectile dysfunction. These medications work by enhancing the natural reaction to stimulation, improving the blood flow needed for erections. Other treatments for ED include topical applications, injections into the penis, surgical devices, and counselling.

Types of medicine

Seven different erectile dysfunction medications are available to buy online from Dr Fox pharmacy:

Each tablet has a different duration of action and side effects – see tablet differences below.

No combination of Viagra/sildenafil, Cialis/tadalafil, Levitra/vardenafil, Spedra/avanafil or other ED treatment should be used at the same time - a break of up to 24 hours should be left.

There is a very rare theoretical risk of abnormal heart rhythm if Viagra (sildenafil) or Levitra (vardenafil) are taken at the same time as some other medications. If you are taking other medication please check this list. This risk is not applicable if taking Cialis (tadalafil) or Spedra (avanafil).

Investigating erectile dysfunction

You should always tell your regular doctor if you are having problems with erections.

Erectile dysfunction can be a symptom of conditions such as diabetes, high blood pressure, high cholesterol, or narrowing of the arteries. Some simple tests may be required. An assessment with a doctor is particularly important if symptoms develop over a period of weeks or months, or even suddenly, without an emotional event to set them off. Erectile dysfunction can be a complication of previous operations or a side effect of some prescribed medication.

Lifestyle and risk factors

Improving lifestyle factors such as diet, exercise, stopping smoking, reducing alcohol intake, and maintaining an active lifestyle has shown improvement in ED in men of all ages. Apart from the general benefits of a healthy lifestyle, studies show improvement in erectile dysfunction symptoms and a reduced need for tablets. ED also shares risk factors with a range of other medical conditions including diabetes, heart disease, and circulatory problems, all of which are also likely to benefit from lifestyle modification.

Starting treatment

It is best to start with a lower strength tablet and build up as needed (see how to start treatment). One type of tablet sometimes works better than another. You may like to try out different tablets to see which ones suit you best.

Sexual stimulation is required for tablets to work. Without it tablets will have no effect.

You can request more than one type of tablet at a time. It is advised to try the same treatment several times before deciding to change tablet type or dosage strength.


Erectile dysfunction can be distressing and lead to relationship difficulties, anxiety, and depression. Your regular doctor may recommend counselling. This may help resolve the cause of erectile dysfunction. In some cases a problem of performance anxiety can be overcome by breaking the cycle of failure with tablet treatments.

Buy treatment

Dr Fox pharmacy supplies erectile dysfunction medication on prescription – you are required to answer a short medical questionnaire before your order can be completed.

Tablet differences

Compare erectile dysfunction drugs
Brand namesViagra, Viagra ConnectCialisLevitraSpedra
Available genericallyYesYesYesNo
Starting dose50mg10mg10mg100mg
Maximum dose100mg20mg20mg200mg
Time taken to start working30-60 minutes30-60 minutes (2.5mg and 5mg tablets can be taken daily)25-60 minutes - faster for orodispersible tablets15-30 minutes on empty stomach, 1.5 hours on full stomach
How long effects last4 hours36 hours4-5 hours4 hours
Warnings and cautions
Do not takeAllergic to ingredients, low or high blood pressure, severe heart or liver problems, loss of vision due to NAION, recent stroke or heart attack
Rare inherited eye diseasesKidney dialysis, rare inherited eye diseasesLiver or kidney problems, rare inherited eye diseases
Exclusions - talk to your doctor firstSickle cell anaemia, multiple myeloma, leukaemia, deformity of the penis, problems with your heart, stomach ulcer or bleeding problems
Drug interactionsAny nitrate-based medication, usually to treat angina (important); 'poppers'; nitric oxide donors, medicines for HIV, AIDS, or fungal infections; riociguat; alpha-blockers; antibiotics clarithromycin, erythromycin; other ED medicines; drugs that can prolong QT interval.
Common side effects (% occurrence)
Adverse eventSildenafilTadalafilVardenafilAvanafil
Dyspepsia (indigestion)4.6%12.3%4%uncommon
Nasal congestion1.1%4.3%10%1.9%
Abnormal vision1.9%< 2%none
Back pain6.5%< 2%
Myalgia (muscle pains)5.7%< 2%
Medical emergencies (very rare)
Urgent medical attention requiredSudden decrease or loss of vision, Priapism (painful erection lasting 2 hours or more), allergic reaction, chest pains, heart attack

Notes: Sexual stimulation is required before erection will take place. See the patient information leaflet links above for full details of cautions and interactions. You may get no side effects. If side effects are severe, stop the medication and see your doctor.

Dr Tony Steele

Authored 18 February 2010 by Dr Tony Steele
MB ChB Sheffield University 1983. Former hospital doctor and GP.

Reviewed by Dr C. Pugh, Dr B. Babor, Dr A. Wood, Dr P. Hunt
Last reviewed 4 January 2022
Last updated 8 June 2022


  1. Medical questions
  2. Choose treatment
  3. Complete order

Answer medical questions to order(erectile dysfunction)

Men only

Have you read the erectile dysfunction medical information?

Please read the medical information.
See also starting treatment for the first time.

Do you sometimes or always have difficulty getting and keeping an erection?

Have you had difficulties with erections for more than a year?

Are your erections sometimes fine?

E.g. when waking in the morning, during masturbation or in some erotic situations.

Is your blood pressure high (over 150/90)?

You must have had a blood pressure check within the last year and know the result. Doctors, nurses, and some pharmacists can check blood pressure. Answer 'Yes' if either figure is high, 150 or 90. A blood pressure measurement whilst taking blood pressure tablets qualifies.

Do you have low blood pressure?

This means any of the following:

  • Low blood pressure requiring investigation
  • Low blood pressure requiring treatment
  • Being prone to faint or feel light-headed for more than a few seconds when standing up quickly or standing for long periods

Are you overweight?

Use this BMI (Body Mass Index) calculator and answer 'yes' if the result is over 30.

Do you smoke, or drink more than 21 units of alcohol per week?

Have you been diagnosed with any of the following?

  • Allergy or reaction to previous impotence treatments
  • Heart disease including heart attack within 6 weeks or angina (heart pain on exertion)
  • History of stroke or mini stroke (transient ischaemic attack)
  • History of vision problems due to poor circulation
  • Family history of the degenerative eye disease, including retinitis pigmentosa (rare)
  • Serious kidney/renal or liver disease
  • Deformity or angulation of the penis (Peyronie’s disease)
  • Sickle cell disease or leukaemia or multiple myeloma
  • A bleeding disorder (such as Haemophilia)
  • Active stomach ulcers (also known as peptic ulcer or gastric ulcer)

Are you taking any of the following?

  • Nitrates for angina or heart failure, includes glyceryl trinitrate, isosorbide mononitrate, isosorbide dinitrate, GTN spray or gel, or nicorandil - serious reaction possible
  • Any recreational drugs, particularly amyl nitrate ('Poppers') - serious reaction possible
  • Existing ED treatment apart from Viagra/sildenafil, Cialis/tadalafil, Levitra/vardenafil, or Spedra/avanafil
  • Ritonavir or Indinavir or medicine for HIV
  • Riociguat for high blood pressure in the lungs
  • Ketoconazole or itraconazole or other anti-fungal medication
  • Alpha-blockers (sometimes used to treat high blood pressure or prostate enlargement) includes alfuzosin, doxazosin, indoramin, prazosin, tamsulosin, terazosin

There is a very rare theoretical risk of abnormal heart rhythm if Viagra/sildenafil or Levitra/vardenafil is taken at the same time as some other medications - please check this list.

Have you been advised to avoid vigorous exercise?

E.g. severe heart failure or unstable angina.

Are you aware if you have a continuous erection for 4 hours or more you should seek immediate medical advice?

This is unlikely to happen and is rare. If it occurs, seek medical advice straight away to prevent permanent damage.

Are you aware you should not take any combination ED treatments at the same time?

  • A break of up to 24 hours should be left.
  • Also do NOT exceed the prescribed dose.

Do you have any further medical information or questions?

Is there anything you do not understand or do you need further help?

Do all the following apply to you?

  • The medication is for my own use and I will not share with anyone else
  • I will read the patient information leaflet supplied with my tablets
  • I will tell my GP about my erectile dysfunction and my treatment
  • I am over 18 and I agree to identity verification checks
  • I have completed this questionnaire myself and fully understand all the information
  • My responses are honest and accurate, and I understand that this is necessary for a safe medical assessment
  • I agree to the terms & conditions, privacy policy, & data sharing policy

The order process

Choose medication, register, and pay

Dr Fox issues prescription online

Pharmacy team post medication direct

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