Along with its needing effects, a drug may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your family doctor immediately if the following side effects was happen
Rare
Erection continuing for more than 4 hours, or painful erection
Check with your family doctor as soon as possible if the following side effects was happen
Rare
Dizziness; lumps in the penis
More common side effects may occur that usually don't needed medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your family doctor if any of the following side effects continue or are bothersome:
Less common or rare
Bruising or bleeding at place of injection; burning - mild along penis; difficulty in ejaculating; swelling at place of injection
Phentolamine injected into the penis may cause tingling at the tip of the penis. This is no cause for concern.
More common side effects not listed above may also occur in some diseaseds. If you notice any other problems, check with your family doctor.