Phentolamine Mesylate
Generic Name: phentolamine mesylate
Brand Names:
Phentolamine Mesylate
DESCRIPTION Phentolamine Mesylate for Injection, USP is an antihypertensive, available in vials for intravenous and intramuscular administration. Each vial contains phentolamine mesylate, USP, 5 mg, and mannitol USP, 25 mg, in sterile, lyophilized form.
Overview
DESCRIPTION Phentolamine Mesylate for Injection, USP is an antihypertensive, available in vials for intravenous and intramuscular administration. Each vial contains phentolamine mesylate, USP, 5 mg, and mannitol USP, 25 mg, in sterile, lyophilized form.
Uses
INDICATIONS AND USAGE Phentolamine Mesylate for Injection, USP is indicated for the prevention or control of hypertensive episodes that may occur in a patient with pheochromocytoma as a result of stress or manipulation during preoperative preparation and surgical excision. Phentolamine Mesylate for Injection, USP is indicated for the prevention or treatment of dermal necrosis and sloughing following intravenous administration or extravasation of norepinephrine. Phentolamine Mesylate for Injection, USP is also indicated for the diagnosis of pheochromocytoma by the Phentolamine Mesylate for Injection, USP blocking test.
Dosage
DOSAGE AND ADMINISTRATION The reconstituted solution should be used upon preparation and should not be stored. Note: Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. 1. Prevention or control of hypertensive episodes in the patient with pheochromocytoma. For preoperative reduction of elevated blood pressure, 5 mg of Phentolamine Mesylate for Injection, USP (1mg for children) is injected intravenously or intramuscularly 1 or 2 hours before surgery, and repeated if necessary.
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. To report SUSPECTED ADVERSE REACTIONS, contact Precision Dose Inc. at 1-844-668-3942 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Interactions
Drug Interactions See DOSAGE AND ADMINISTRATION , Diagnosis of pheochromocytoma , Preparation .
Warnings
WARNINGS Myocardial infarction, cerebrovascular spasm, and cerebrovascular occlusion have been reported to occur following the administration of Phentolamine Mesylate for Injection, USP, usually in association with marked hypotensive episodes. For screening tests in patients with hypertension, the generally available urinary assay of catecholamines or other biochemical assays have largely replaced the Phentolamine Mesylate for Injection, USP and other pharmacological tests for reasons of accuracy and safety. None of the chemical or pharmacological tests is infallible in the diagnosis of pheochromocytoma. CONTRAINDICATIONS Myocardial infarction, history of myocardial infarction, coronary insufficiency, angina or other evidence suggestive of coronary artery disease; hypersensitivity to phentolamine or related compounds.
Pregnancy
Pregnancy Category C Administration of Phentolamine Mesylate for Injection, USP to pregnant rats and mice at oral doses 24-30 times the usual daily human dose (based on a 60-kg human) resulted in slightly decreased growth and slight skeletal immaturity of the fetuses. Immaturity was manifested by increased incidence of incomplete or unossified calcanei and phalangeal nuclei of the hind limb and of incompletely ossified sternebrae. At oral doses 60 times the usual daily human dose (based on a 60-kg human), a slightly lower rate of implantation was found in the rat.
Storage
HOW SUPPLIED Vials— each containing 5 mg of Phentolamine mesylate, USP, and 25 mg of mannitol, USP, in sterile, lyophilized form. Trays of 10 with NDC 68094-101-10 Cartons of 1 with NDC 68094-101-20 The reconstituted solution should be used upon preparation and should not be stored.
Frequently Asked Questions
What is Phentolamine Mesylate used for?▼
INDICATIONS AND USAGE Phentolamine Mesylate for Injection, USP is indicated for the prevention or control of hypertensive episodes that may occur in a patient with pheochromocytoma as a result of stress or manipulation during preoperative preparation and surgical excision. Phentolamine Mesylate for Injection, USP is indicated for the prevention or treatment of dermal necrosis and sloughing following intravenous administration or extravasation of norepinephrine. Phentolamine Mesylate for Injection, USP is also indicated for the diagnosis of pheochromocytoma by the Phentolamine Mesylate for Injection, USP blocking test.
What are the side effects of Phentolamine Mesylate?▼
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. To report SUSPECTED ADVERSE REACTIONS, contact Precision Dose Inc. at 1-844-668-3942 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Can I take Phentolamine Mesylate during pregnancy?▼
Pregnancy Category C Administration of Phentolamine Mesylate for Injection, USP to pregnant rats and mice at oral doses 24-30 times the usual daily human dose (based on a 60-kg human) resulted in slightly decreased growth and slight skeletal immaturity of the fetuses. Immaturity was manifested by increased incidence of incomplete or unossified calcanei and phalangeal nuclei of the hind limb and of incompletely ossified sternebrae. At oral doses 60 times the usual daily human dose (based on a 60-kg human), a slightly lower rate of implantation was found in the rat.
What are the important warnings for Phentolamine Mesylate?▼
WARNINGS Myocardial infarction, cerebrovascular spasm, and cerebrovascular occlusion have been reported to occur following the administration of Phentolamine Mesylate for Injection, USP, usually in association with marked hypotensive episodes. For screening tests in patients with hypertension, the generally available urinary assay of catecholamines or other biochemical assays have largely replaced the Phentolamine Mesylate for Injection, USP and other pharmacological tests for reasons of accuracy and safety. None of the chemical or pharmacological tests is infallible in the diagnosis of pheochromocytoma. CONTRAINDICATIONS Myocardial infarction, history of myocardial infarction, coronary insufficiency, angina or other evidence suggestive of coronary artery disease; hypersensitivity to phentolamine or related compounds.
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Medical Disclaimer
This drug information is for educational purposes only and should not replace professional medical advice. Drug information is sourced from the FDA National Drug Code Directory and Structured Product Labeling. Always consult with a healthcare provider before starting, stopping, or changing any medication.