ebo. No clinically meaningful effects on cardiac rhythm were observed.
12.3. Pharmacokinetics
Linear pharmacokinetics were observed for glycopyrrolate (dose range: 18 to 144 mcg) and formoterol fumarate (dose range: 2.4 to 19.2 mcg) after oral inhalation.
Absorption
Glycopyrrolate: Following inhaled administration of BEVESPI AEROSPHERE in subjects with COPD, Cmax occurred at 5 minutes. Steady state is expected to be achieved within 2-3 days of repeated dosing of BEVESPI AEROSPHERE and the extent of exposure is approximately 2.3 times higher than after the first dose.
Formoterol Fumarate: Following inhaled administration of BEVESPI AEROSPHERE in subjects with COPD, Cmax occurred within 20 to 60 minutes. Steady state is expected to be achieved within 2-3 days of repeated dosing with BEVESPI AEROSPHERE and the extent of exposure is approximately 1.5 times higher than after the first dose.
Distribution
Glycopyrrolate: Population pharmacokinetic analysis showed that estimated Vc/F (volume of the central compartment), and V2/F (volume of the peripheral compartment) are 951 L, and 2019 L, respectively.
Formoterol Fumarate: Population pharmacokinetic analysis showed that estimated Vc/F (volume of the central compartment), and V2/F (volume of the peripheral compartment) are 948 L, and 434 L, respectively. Over the concentration range of 10-500 nmol/L, plasma protein binding of formoterol ranged from 46% to 58%.
Metabolism
Glycopyrrolate: Based on information from the published literature, metabolism plays a minor role in the overall elimination of glycopyrrolate.
Formoterol Fumarate: The primary metabolism of formoterol is by direct glucuronidation and by O-demethylation followed by conjugation to inactive metabolites. Secondary metabolic pathways include deformylation and sulfate conjugation. CYP2D6 and CYP2C have been identified as being primarily responsible for O-demethylation.
Elimination
Glycopyrrolate: After IV administration of a 0.2 mg radiolabeled glycopyrrolate, 85% of dose recovered was recovered in urine 48 hours post dose and some of radioactivity was also recovered in bile. The terminal elimination half-life derived via population pharmacokinetics analysis was 11.8 hours.
Formoterol Fumarate: The excretion of formoterol was studied in four healthy subjects following simultaneous administration of radiolabeled formoterol via the oral and IV routes. In that study, 62% of the radiolabeled formoterol was excreted in the urine while 24% was eliminated in the feces. The terminal elimination half-life derived via population pharmacokinetics analysis was 11.8 hours.
Special Populations
Effect of age, sex, race/ethnicity, or body weight:
Population pharmacokinetic analysis showed no evidence of a clinically significant effect of age, sex, race/ethnicity, or body weight on the pharmacokinetics of glycopyrrolate and formoterol.
Hepatic Impairment: Dedicated studies eva luating effect of hepatic impairment on the pharmacokinetics of glycopyrrolate and formoterol were not conducted.
Renal Impairment: Dedicated studies eva luating effect of renal impairment on the pharmacokinetics of glycopyrrolate and formoterol were not conducted. When glycopyrrolate was administered IV in uremic patients undergoing renal transplantation, mean elimination half-life was significantly longer (46.8 minutes) than in healthy patients (18.6 minutes). The mean AUC (10.6 hr-μg/L) |
