Phenoxybenzamine Side Effects

Some side effects of phenoxybenzamine may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

For the Consumer

Applies to phenoxybenzamine: oral capsule

Get emergency medical help if you have any of these signs of an allergic reaction while taking phenoxybenzamine: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop using phenoxybenzamine and call your doctor at once if you severe dizziness or if you feel like you might pass out.

Less serious side effects of phenoxybenzamine may include:

• stuffy nose;

• mild dizziness or drowsiness;

• blurred vision;

• trouble having an orgasm;

• upset stomach; or

• tired feeling.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

For Healthcare Professionals

Applies to phenoxybenzamine: compounding powder, oral capsule

Cardiovascular

Cardiovascular side effects have included postural hypotension and tachycardia. These symptoms are evidence of adrenergic blockade and vary according to the degree of blockade.

Genitourinary

Genitourinary side effects have included inhibition of ejaculation. This symptom is indicative of adrenergic blockade and varies according to the degree of blockade.

Respiratory

Respiratory side effects have included nasal congestion. This symptom is indicative of adrenergic blockade and varies according to the degree of blockade.

Ocular

Ocular side effects have included miosis. This symptom is indicative of adrenergic blockade and varies according to the degree of blockade.

Nervous system

Nervous system side effects have included drowsiness and fatigue.

Gastrointestinal

Gastrointestinal side effects have included gastrointestinal irritation.

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