You’ll be trained by a doctor or nurse how to mix the right dosage, draw the proper amount of medication into a syringe, check for and eliminate air bubbles, and inject the medication yourself. You will also be shown exactly where to inject the medication so that you don’t cause any injury to nerves or blood vessels.
You must change the injection site each time you use the medication (say, alternating right and left sides). Bear in mind that it can take two to six injections before you find the right dosage for an erection suitable for sexual activity, yet that doesn’t last for too long.