This list may not describe all possible interactions. Give your health care provider a list of all the medicines, herbs, non-prescription drugs, or dietary supplements you use. Also tell them if you smoke, drink alcohol, or use illegal drugs. Some items may interact with Phentolamine.

NOTE: This sheet is a summary. It may not cover all possible information. If you have questions about Phentolamine, talk to your doctor, pharmacist, or health care provider.