July 23, 2016
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Phentolamine Mesylate for Injection

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Phentolamine Mesylate for Injection

Phentolamine Mesylate for Injection Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Phentolamine Mesylate

For preoperative reduction of elevated blood pressure, a dose of 5 mg of phentolamine mesylate (1 mg for children) is injected intravenously or intramuscularly 1 or 2 hours before surgery. Phentolamine mesylate may interact with other drugs. Tell your doctor all medications and supplements you use. During pregnancy, phentolamine mesylate should be used only if prescribed. It is unknown if this drug is excreted in human milk. Consult your doctor before breastfeeding.

Our Phentolamine Mesylate for Injection Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Phentolamine Mesylate for Injection FDA Prescribing Information: Side Effects
(Adverse Reactions)


Acute and prolonged hypotensive episodes, tachycardia, and cardiac arrhythmias have been reported. In addition, weakness, dizziness, flushing, orthostatic hypotension, nasal stuffiness, nausea, vomiting, and diarrhea may occur.

Read the entire FDA prescribing information for Phentolamine Mesylate for Injection (Phentolamine Mesylate)

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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