Viridal (Alprostadil) Duo 20mcg/ml 2 Injections Starter Pack

To find full and in depth instructions on how to use Viridal Duo 20 mcg, consult your Patient Information Leaflet for complete guidance and direction.

Most men need between 10 and 20 micrograms for each injection

Do not use more than 40 micrograms in one injection. 

Do not use more than 2 or 3 times a week with at least 24 hours between the injections.

The active substance is alprostadil. There are three strengths of Viridal Duo that contain the active substance alprostadil 10, 20 or 40 micrograms. The other ingredients of the powder are lactose monohydrate and alfadex. The liquid contains sodium chloride and water for injection.

Side Effects of Alprostadil

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 the 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 erection that lasts for more than 4 hours
• Serious allergic reactions which causes 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.