Phentolamine

Drug Details

Phentolamine is a medication that blocks alpha-adrenergic receptors, leading to the relaxation of blood vessels and a subsequent decrease in blood pressure. It is commonly used to manage hypertensive episodes associated with pheochromocytoma, a rare tumor that causes excessive release of catecholamines. Additionally, phentolamine is employed to prevent tissue damage following the accidental leakage of certain vasoconstrictive drugs into surrounding tissues. In dental procedures, it helps reverse the effects of local anesthesia, reducing the duration of numbness in soft tissues. The medication is typically administered via injection, either intramuscularly or intravenously, and acts rapidly with a short duration of effect. Common side effects may include low blood pressure, rapid heart rate, and gastrointestinal discomfort. Due to its cardiovascular effects, phentolamine is contraindicated in individuals with certain heart conditions, such as myocardial infarction or angina. Therefore, it should be used under the supervision of a healthcare professional.