What side effects may I notice from receiving Phenoxybenzamine?

Side effects that you should report to your doctor or health care professional as soon as possible:
-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-confusion
-dizziness or drowsiness
-feeling faint or lightheaded
-fast or irregular heartbeat, palpitations or chest pain
-unusually weak or tired
-vomiting

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
-headache
-nasal stuffiness
-nausea
-sexual difficulties for men

This list may not describe all possible side effects for Phenoxybenzamine. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.