Viridal Duo (Alprostadil) (10mcg, 20mcg, 40mcg)

Viridal should be injected into the shaft of the penis at least 10-15 minutes before you want to have sex. Sexual stimulation is not necessary to produce an erection with this medicine.

Most men need 10 to 20 micrograms for each injection. Always follow your doctor's dosage instructions on the label. You must not use more than 40 micrograms in one injection.

Before using the Viridal Duo starter pack, a medical professional must show you how to use Viridal Duo injections.

You must always double check the dose you are taking and follow the instructions given to you by your prescribing doctor.

You shouldn’t use Viridal more than once in 24 hours or more frequently than 2 - 3 times a week. If you use more Viridal than you should, this runs the risk of severe side effects.

You must be evaluated by your GP every 3 months to ensure you are getting the best results from this medicine. They will also monitor its effectiveness and whether you require a dose increase.

How do I inject my penis with Viridal Duo?

You will need:

1. Easy-duo Injector
2. Viridal cartridge (contains alprostadil and saline)
3. Injection needle

These are all included in Viridal's box.

Important:  

• Check the injector for damage before use
• Only use with Viridal cartridges and BD Microfine needles
• Needles and cartridges are not included

Steps:

1. Prepare the needle:

• Check the needle’s seal and remove it
• Attach the needle to the injector by screwing it on tightly

2. Prepare the cartridge:

• Unscrew the plunger
• Clean the cartridge tip with an alcohol swab
• Insert the cartridge and screw the plunger back on

3. Mix the solution:

• Hold the injector with the needle up
• Push the plunger until the grey stoppers meet, dissolving the powder
• Shake gently until the solution is clear

4. Remove air bubbles:

• Remove both needle caps
• Tap the injector to move bubbles upward, then push the plunger to release a drop of solution

5. Set the dose:

• Move the plunger to the prescribed dose

6. Prepare injection site:

• Clean the injection site and let it dry
• Ensure the dose is correct and no air bubbles remain

7. Inject:

• Hold the injector level and insert the needle straight into the site
• Slowly inject the solution over 5–10 seconds

8. After injection:

• Remove the needle
• Apply pressure to the site if bleeding occurs

9. Wait for erection:

• Expect an erection in 5–15 minutes, lasting about 1 hour
• Contact your doctor if the erection lasts 2–4 hours, or seek help if it lasts longer than 4 hours

You can find the full Viridal Duo instructions on the patient information leaflet here.

With any medication you take, there is always a risk of side effects. Some are more common than others, and often side effects may subside with regular usage of the medicine. If the side effects do not subside, you should report them to us, or your GP.

Very common:

• Pain in the penis

Common:  

• Burning sensation during injection which quickly gets better  
• Pain at the site of injection  
• Lumps at the site of injection or in your penis after long-term use
• Spot-like bruising (blood spots under the skin) at the site of injection
• Fluttering or vibrating feeling sensation due to uncontrollable muscle movement
• Erections might occur more often and longer in duration
• Bend or kink in the penis, especially after long-term use

Seek immediate medical help if you have any of the following symptoms:  

• An painful erection that lasts for more than 4 hours
• Serious allergic reactions which cause difficulty in breathing or dizziness
• Skin reactions such as rashes and blistering

For a full list of side effects, please read the patient information leaflet.

Viridal Duo warnings

Do not combine Viridal Duo with any medications or muscle relaxants. These can increase the chance of having long erections lasting over four hours. You run the risk of endangering your health and aggravating your condition if you combine these types of medications.

We recommend that you avoid operating heavy equipment while using Viridal Duo. The drug may cause a sudden drop in blood pressure.