Viridal belongs to a group of medicines called prostaglandins. Viridal contains the active ingredient alprostadil. Alprostadil is similar to prostaglandin E, (PGE), that occurs naturally in the body. The medicine works by widening blood vessels & increasing blood flow to your penis. Viridal is used to help you get & maintain an erection when you have insufficient PGE. Viridal comes in a glass cartridge with two chambers. One chamber contains alprostadil, the other contains sodium chloride solution. These are mixed together to make a solution that is injected into the penis. I have a private prescription If you have a prescription for Viridal please CLICK HERE to place an order. I do not have a prescription Pharmacy 2U can only dispense a Prescription Only Medicine (POM) if your order is accompanied by a valid UK prescription issued by your doctor, consultant or other medical practicioner. Details of where to send the prescription will be issued with your unique order number at the confirmation page. Further Information Viridal (Alprostadil)