“This finding, in association with a fall in amount of the second, meta-O-dealkylated lactam metabolite (MODLF) recovered in its conjugated forms in the urine, suggests that quinine inhibits both the first and the second steps of the sequential metabolism of flecainide.”
“When the subjects received quinine in addition to flecainide , the PR interval in the ECG was slightly more prolonged than with flecainide alone.”