Phenoxybenzamine Side Effects
Medically reviewed by Drugs.com. Last updated on Jan 9, 2022.
For the Consumer
Applies to phenoxybenzamine: oral capsule
In rats and mice, phenoxybenzamine has been found to increase the risk of development of malignant tumors. It is not known if phenoxybenzamine increases the chance of tumors in humans.
Side effects requiring immediate medical attention
Along with its needed effects, phenoxybenzamine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Side effects not requiring immediate medical attention
Some side effects of phenoxybenzamine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.
Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Dizziness or lightheadedness, especially when getting up from a lying or sitting position
- fast heartbeat
- pinpoint pupils
- stuffy nose
- dryness of mouth
- lack of energy
- sexual problems in males
- unusual tiredness or weakness
For Healthcare Professionals
Applies to phenoxybenzamine: compounding powder, oral capsule
Genitourinary side effects have included inhibition of ejaculation. This symptom is indicative of adrenergic blockade and varies according to the degree of blockade.[Ref]
Ocular side effects have included miosis. This symptom is indicative of adrenergic blockade and varies according to the degree of blockade.[Ref]
Nervous system side effects have included drowsiness and fatigue.[Ref]
Gastrointestinal side effects have included gastrointestinal irritation.[Ref]
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- Drug class: miscellaneous cardiovascular agents
Related treatment guides
1. "Product Information. Dibenzyline Capsules (phenoxybenzamine)." SmithKline Beecham, Philadelphia, PA.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
Some side effects may not be reported. You may report them to the FDA.