Comparative Pharmacology
Head-to-head clinical analysis: ADRENALIN versus EPIPEN E Z PEN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ADRENALIN versus EPIPEN E Z PEN.
ADRENALIN vs EPIPEN E Z PEN
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Direct-acting sympathomimetic amine that acts on alpha- and beta-adrenergic receptors. Alpha-1 activation causes vasoconstriction, beta-1 activation increases heart rate and contractility, beta-2 activation causes bronchodilation.
Epinephrine is a direct-acting sympathomimetic amine that acts on alpha- and beta-adrenergic receptors. Alpha-adrenergic stimulation increases peripheral vascular resistance, reversing hypotension and improving coronary perfusion. Beta-adrenergic stimulation causes bronchodilation, positive inotropy, and chronotropy.
1 mg (1 mL of 1:1000 solution) intramuscularly or subcutaneously every 5-20 minutes as needed; for cardiac arrest: 1 mg intravenously or intraosseously every 3-5 minutes.
0.3 mg intramuscularly every 5-15 minutes as needed for anaphylaxis. Administer into anterolateral thigh.
None Documented
None Documented
Approximately 2-3 minutes for the parent drug in plasma; clinical effects are short-lived due to rapid uptake and metabolism. In severe shock or hepatic impairment, half-life may be slightly prolonged.
The terminal elimination half-life of epinephrine is approximately 2-3 minutes when administered intravenously. The short half-life necessitates repeated doses or continuous infusion for sustained effect.
Primarily metabolized in the liver and other tissues by catechol-O-methyltransferase (COMT) and monoamine oxidase (MAO). Renal excretion of metabolites (metanephrine, vanillylmandelic acid) and unchanged drug (<2% as unchanged). Biliary/fecal excretion is minimal (<5%).
Epinephrine is rapidly metabolized in the liver and other tissues by catechol-O-methyltransferase (COMT) and monoamine oxidase (MAO). Approximately 80-90% of an intravenous dose is excreted in the urine as inactive metabolites (metanephrine, vanillylmandelic acid, 3,4-dihydroxymandelic acid) with less than 5% excreted unchanged.
Category C
Category C
Adrenergic Agonist
Adrenergic Agonist