Study of the pharmacokinetics of various drugs under conditions of antiorthostatic hypokinesia and the pharmacokinetics of acetaminophen under long-term spaceflight conditions.

Abstract

To study the pharmacokinetics and relative bioavailability of drugs of different chemical structure and pharmacological action under conditions simulating the effects of some factors of spaceflight, as well as the peculiarities of the pharmacokinetics of acetaminophen under long-term spaceflight conditions. The pharmacokinetics of verapamil (n=8), propranolol (n=8), etacizine (n=9), furosemide (n=6), and acetaminophen (n=7) in healthy volunteers after a single oral administration under normal conditions (background) and under antiorthostatic hypokinesia (ANOH), the pharmacokinetics of acetaminophen in spaceflight members under normal ground conditions (background) (n=8) and under prolonged spaceflight conditions (SF) (n=5) were studied. The stay of volunteers under antiorthostatic hypokinesia had different effects on the pharmacokinetics and bioavailability of drugs: Compared to background, there was a decreasing trend in Vz for verapamil (-54Δ%), furosemide (-20Δ%), propranolol (-8Δ%), and acetaminophen (-9Δ%), but a statistically significant increase in Vz was found for etacizine (+39Δ%); there was an increasing trend in Clt for propranolol (+13Δ%) and acetaminophen (+16Δ%), and a decreasing trend in Clt for etacizine, verapamil, and furosemide (-22,-23 and-9Δ% respectively) in ANOH. The relative bioavailability of etacizine, verapamil, and furosemide in ANOH increased compared to background (+40, +23 and +13Δ%, respectively), propranolol and acetaminophen decreased (-5 and-12Δ% accordingly). The relative rate of absorption of etacizine and furosemide in ANOH decreased (-19 and-20Δ%, respectively) while that of verapamil, propranolol, and acetaminophen increased (+42, +58 and +26Δ%, respectively). A statistically significant decrease in AUC0-∞ (-57Δ%), Cmax (-53Δ%), relative bioavailability of acetaminophen (-52Δ%) and a sharp increase in Clt (+147Δ%), Tmax (+131Δ%) as well as a trend towards a significant decrease in T1/2 (-53Δ%), MRT (-36Δ%) and a moderate increase in Vz (+24Δ%) were found under control compared to background. Unidirectional changes in AUC0-∞, Clt, T1/2, MRT and relative bioavailability of acetaminophen, which are more pronounced in SF and opposite dynamics for Cmax, Tmax, Vz were found in ANOH and SP compared to background studies. The data obtained allow recommending the studied drugs for rational pharmacotherapy in the possible development of cardiovascular disease in manned spaceflight.