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Viridal Duo


Viridal Duo is an injectable treatment for erectile dysfunction, marketed by Advanz Pharma. It contains alprostadil, which functions by widening blood vessels.

If you’ve used this treatment before, you can renew your prescription and buy Viridal online with our secure consultation service. Orders are checked by a registered prescriber before being dispensed at our UK pharmacy.

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The price below are inclusive of your consultation, prescription, the medicine itself and secure next-day shipping from our UK pharmacy.

The price below are inclusive of your consultation, prescription, the medicine itself and secure next-day shipping from our UK pharmacy.

£39.00 + Free 24 Hr Delivery
£95.00 + Free 24 Hr Delivery
Viridal Duo
£45.00 + Free 24 Hr Delivery
Viridal Duo + plunger
£55.00 + Free 24 Hr Delivery

Viridal Duo is an injectable treatment for erectile dysfunction, marketed by Advanz Pharma. It contains alprostadil, which functions by widening blood vessels.

If you’ve used this treatment before, you can renew your prescription and buy Viridal online with our secure consultation service. Orders are checked by a registered prescriber before being dispensed at our UK pharmacy.

This content was reviewed by a clinician on

26 April 2022
dr daniel

Dr Daniel Atkinson

(GP Clinical Lead - GMC No. 4624794) 26 April 2022
Product information

Viridal Duo is a treatment for erectile dysfunction, given by injection. It contains an active ingredient called alprostadil, which works by relaxing blood vessels and increasing blood flow to the penis. A prescriber will issue a low dose to start with, and advise the patient to gradually increase their dose with each use until the target dose has been reached. Once the most suitable dose has been determined, the treatment should help the user to get an erection within 5-15 minutes. It will typically work for up to an hour.

Because we only offer this treatment to people who have used it before, we only supply the continuation pack for this medicine, not the starter pack. Please note that the continuation pack we offer contains fresh needles, but does not come supplied with a plunger to use the medicine. You must keep your plunger from your starter pack, and use this with the medicines supplied in the continuation pack.

It is therefore very important that you do not order this medication from us if you have not already used the starter pack, and been shown how to administer it in person by a doctor or nurse.

If you have used the starter pack before, but have not kept your plunger and wish to order Viridal online from us, please contact us for more assistance.

Viridal Duo 20mcg + plunger contains a pre-built plunger but it is still only suitable for those that have received training by a healthcare professional on how to administer the injection. This product is similar to Caverject and can be ordered by those who have used Caverject previously.

How common is erectile dysfunction?

It is thought that about half of all men over 40 will experience erectile dysfunction, or impotence, at some point. However, even though it is more common in older men, it can and often does affect younger men too.

What causes it?

Several factors can contribute towards erectile dysfunction. A lack of sufficient blood flow to the penis is one cause. For an erection to occur, blood needs to be able to flow into the smooth muscle tissue in the penis. When blood flow is restricted, this can induce erectile problems.

Issues with blood flow may occur in men with certain conditions, such as high blood pressure or high cholesterol. It can also be a result of obesity; and smoking and alcohol consumption can sometimes be causes too.

Emotional or psychological factors, such as stress or anxiety, can also cause erection problems. This is much more likely to be the cause if someone only has occasional symptoms; for instance if someone’s erections are usually fine, but they have difficulty getting one during intercourse itself.

Treatment methods

Medication may not always be required to effectively treat the condition. If a person’s symptoms are the result of an emotional problem, for example, they may benefit from talking the issue out with their partner, or speaking to a therapist or counsellor.

If treatment is necessary, it’s typical for oral medicines such as Viagra or Cialis to be recommended in the first instance. If these are ineffective, or unsuitable for the patient, then a doctor may advise trying a topical or injectable form of medication, such as Viridal Duo. You can read about the other available treatment options on our information page.

How does Viridal Duo work?

There are several processes which take place in the body to produce an erection. In response to sexual stimuli, certain chemical transmitters in the body ‘tell’ blood vessels near the penis to widen, and this allows blood to flow into the smooth muscle (or corpus cavernosum) in the penile shaft. When this muscle is filled with blood, the penis becomes erect.

Prostaglandin E1, or PGE1, is an example of a chemical which tells blood vessels near the penis to relax and let blood in. Erectile dysfunction can be the result of these chemicals either not working properly or not receiving the signal they need.

Alprostadil is a synthetic version of PGE1. It functions in the same way, by telling taught blood vessels near the penis to widen. This facilitates blood flow, and makes getting and keeping an erection easier.

How can I buy Viridal Duo online?

Patients who have used this treatment before can order it online through our confidential consultation service. Select your dosage above by clicking ‘start now’ to be taken to our questionnaire. Once you have provided your answers, your prescription request will be checked by our doctor or pharmacy prescriber. Approved orders are dispensed at our UK-based pharmacy before being shipped by tracked delivery.

If you haven’t used Viridal Duo before or haven’t been shown how to use it by a doctor or nurse, then you should not order this treatment online. See your GP if you are experiencing erectile dysfunction symptoms for the first time, or if you have tried using oral treatments and these have not worked.

Select dose
Page last reviewed:  26/04/2022

Make sure you read the patient information leaflet fully before use, and that you only ever use this treatment according to the directions given by your prescriber.

We only offer the continuation pack for this treatment. If you have not used the starter pack previously and been shown how to use this medicine, you should not order it from us (because you will not receive a plunger to administer the treatment). If you have not used Viridal before, we recommend you speak to your doctor about the treatment in person first.

  1. Before you use this medication for the first time, you will need to be shown by a doctor or nurse in person how to administer it.
  2. A doctor may issue a 1.25mcg, 2.5mcg or 5mcg dose to begin with, then advise you to increase the dose each time you use it until achieving the target dose.
  3. The suitable dose should help to provide an erection which develops in 5-15 minutes and  lasts for up to 60 minutes.
  4. The typical dose for most men is 10-20mcg per injection.
  5. Do not exceed the prescribed dose.
  6. Viridal shouldn’t be used more than once in any 24 hour period, or more than two or three times per week.
  7. For detailed instructions on how to administer Viridal, please refer to the patient information leaflet.

If you need any further advice on using this treatment, contact your doctor or pharmacist.

Page last reviewed:  26/04/2022
Side effects

Seek medical advice right away if you experience:

  • an erection that does not go away after four hours (priapism);
  • any signs of an allergic reaction, such as hives, swelling of the face, lips or throat, or any difficulty breathing;
  • or any other side effects that become serious.

Other side effects include:

Very common (1 in 10 people or more):

Pain in the penis.

Common (1 in 10 people or less):

Temporary burning sensation during injection or pain at injection site, lumps at the site of injection after long-term use, spot-like bruising at the site of injection, fluttering or vibrating feeling sensation caused by uncontrollable muscle movement, erections occuring more often and lasting longer, bend or kink in the penis, especially after long-term use.

Uncommon (1 in 100 people or less):

Redness, itching, swelling, blistering, numbness, tenderness or a feeling of warmth
at the site of injection, bleeding at the site of injection, headache, priapism, fungal infection, cold, reduced or heightened sensation, dilation of the pupils, heart rhythm changes, low blood pressure, increased creatinine, drop in blood flow to the arms or legs, feeling sick, dry mouth, skin rash, sweating, urinary pain or urgency, urinating more often, bleeding in the urethra, increase in iron stores in the body, erectile dysfunction, ejaculation problems, pain, lumps or swelling in the testicles, pain in the pelvis, swelling or reddening of the scrotum or the tip of the penis.

Rare (1 in 1,000 people or less):

Dizziness or difficulty breathing caused by allergic reaction, rashes, blisters, drop in blood pressure, scarring of the inside of the penis after long-term use, vertigo.

Very rare (1 in 10,000 people or less):

Abnormal drop in the number of platelets.Frequency not known:

Loss of memory, stroke, angina, heart attack.

Warnings and contraindications

Taking it with other medicines

Let your doctor know during consultation if you are using, or have recently used, any other treatments.

This is particularly important if you are taking (or have recently taken): drugs for depression called MAOIs, such as phenelzine; any other treatments for erectile dysfunction; blood-thinning medicines such as warfarin; drugs to lower blood pressure; or medicines used to treat blood clotting problems.

Conditions to look out for

You prescriber needs to be made aware of your medical history and any conditions that you have currently during consultation.

Do not use Viridal Duo if you have: an allergy to anything in the medicine; a deformity of the penis such as Peyronie’s disease, scarring of the penis or foreskin, or any disease affecting the penis; sickle-cell disease; leukemia; multiple myeloma; an implant in the penis; been told not to not have sex, due to heart problems or a stroke; a drug addiction.

If you have any of the following, you should speak to your pharmacist or doctor before using Viridal Duo: one or more cardiovascular risk factors, such as high blood pressure, high cholesterol or if you smoke, or are overweight or obese; heart problems; fainting or blackouts; short-term speech, hearing or vision problems; lung problems; one or more risk factors for stroke; a disease affecting blood clotting.

Pregnancy and breastfeeding

The treatment should never be used by women.

If your partner is pregnant, breastfeeding or of child-bearing age, you should use a condom when using Viridal.

Driving and using machines

This medicine can cause dizziness. Make sure you are not affected by this before attempting to drive or use machinery.

Sexually transmitted infections

The injection can cause a small amount of bleeding at the injection site. It is important to make sure you use a condom to lower the risk of STIs.

Page last reviewed:  26/04/2022

Can I still drink alcohol?

Alcohol can contribute towards erectile problems, so it is not recommended that you drink alcohol when using this treatment.

How should I store it?

Keep in the original packaging, below 25°C, and out of the reach of children.

Am I allergic to anything in the medicine?

It contains: alprostadil, lactose monohydrate, alfadex, sodium chloride and water for injection.

Do not use Viridal if you are allergic to any of the above.

Is it available over-the-counter?

No. Viridal Duo is prescription only.

How to buy Viridal Duo online

Before using Viridal Duo for the first time, a doctor or nurse will need to show you how to use it. If you haven’t taken it before, you should not order it online, and see your GP.

Patients who have been shown how to administer the treatment and who have used it before can order Viridal Duo with our UK pharmacy service. Click ‘buy now’ to take our questionnaire and start your consultation. After your order has been approved by our clinician, a prescription for your treatment will be issued and dispensed at our pharmacy. Medicines are shipped in discreet packaging by next-day courier.

Page last reviewed:  26/04/2022
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