Does epinephrine commonly cause tachyphylaxis?

Does epinephrine commonly cause tachyphylaxis?

• A. No
• B. Yes, due to receptor desensitization
• C. Only with repeated dosing
• D. Common

Answer: (A)

Rapid decrease in effect after repeated dosing is tachyphylaxis. For epinephrine, this isn’t a common issue in typical clinical use. The drug works by stimulating multiple adrenergic receptors (alpha1 for vasoconstriction, beta1 for increased heart rate and contractility, beta2 for bronchodilation), and its effects are short-lived due to a brief action window. Between doses, receptors can reset, so responses largely return and efficacy is generally preserved with repeated but appropriately spaced dosing. While very prolonged, high-dose exposure to catecholamines can theoretically lead to receptor desensitization, in everyday practice epinephrine does not commonly cause tachyphylaxis.

Rapid decrease in effect after repeated dosing is tachyphylaxis. For epinephrine, this isn’t a common issue in typical clinical use. The drug works by stimulating multiple adrenergic receptors (alpha1 for vasoconstriction, beta1 for increased heart rate and contractility, beta2 for bronchodilation), and its effects are short-lived due to a brief action window. Between doses, receptors can reset, so responses largely return and efficacy is generally preserved with repeated but appropriately spaced dosing. While very prolonged, high-dose exposure to catecholamines can theoretically lead to receptor desensitization, in everyday practice epinephrine does not commonly cause tachyphylaxis.