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“In addition, aminophylline may have acted synergistically with previously administered epinephrine by inhibiting phosphodiesterase activity or by further releasing endogenous catecholamines [10].”
“Plasma epinephrine increased from 40 +/- 6 to 57 +/- 9 pg/ml (p less than 0.05), and plasma norepinephrine increased from 406 +/- 63 to 522 +/- 90 pg/ml (p less than 0.01) during the aminophylline infusion.”
The American review of respiratory disease • 1987 | View Paper
“Resistant to two doses of subcutaneous epinephrine (1 mL of 1:1000 dilution) and one intravenous dose of aminophylline (250 mg), the bronchospasm was rapidly relieved by metaproterenol sulfate given by inhalation one hour later.”
“ Aminophylline , an inhibitor of phosphodiesterase, and epinephrine , a beta-adrenergic agent, showed an inhibitory effect, and these effects were reversible.”
The Tohoku journal of experimental medicine • 1979 | View Paper
“These studies demonstrated that intravenous infusion of aminophylline increases the urinary excretion of epinephrine and norepinephrine in man, the rate of excretion of epinephrine being greater than that of norepinephrine.”