TY - JOUR
T1 - Population pharmacokinetics of clarithromycin in Mexican hospitalized patients with respiratory disease
T2 - Evidence for a reduced clearance
AU - Lemus-Castellanos, A. E.
AU - Trocóniz, I. F.
AU - Garrido, M. J.
AU - Soto, V. Granados
AU - Flores-Murrieta, F. J.
N1 - Publisher Copyright:
© 2017 A.E. Lemus-Castellanos etal.
PY - 2017
Y1 - 2017
N2 - Objective: To describe quantitatively the variability associated to the pharmacokinetic (PK) processes of clarithromycin (CLA) in Mexican hospitalized patients with respiratory infection and to determine whether the 6-beta-hydroxycortisol(6p-OHC)/cortisol ratio, among other factors would partially explain such variability. Materials and Methods: Fifty three patientsaged>18years with respiratorydisease treated with CLA were included in the study. An average of 3 blood samples per patient were obtained at approximately the followingTimes After Dosing (TAD): 0.5,1.25,2,3,4,6,9 and 12 h. Clarithromycin was given orally or i.v., twice daily at the dose of 500 mg. Around the same times at which blood samples were collected, one urine sample was obtained for determining the 6p-OHC/cortisol ratio. The serum concentration vs time data of CLA were modeled using the population approach with NONMEM 7.2. Results: A one-compartment disposition model with first-order rate ofabsorption and concentration independent distribution and elimination provided a reasonable description of the data. Absolute bioavailability of CLA was not different from 1 (p>0.05). The population estimate of total clearance was 14.6 L h_l, lower than that reported previously for healthy volunteers. Final population model included body weight as the unique covariate affecting the apparent volume of distribution. Conclusion: The study population showed a total clearance lower than that reported for healthy volunteers from other countries, probably due to the low activity of CYP3A determined in this population. However, the CYP3A activity level did not result as a significative covariable of the CLA total clearance.
AB - Objective: To describe quantitatively the variability associated to the pharmacokinetic (PK) processes of clarithromycin (CLA) in Mexican hospitalized patients with respiratory infection and to determine whether the 6-beta-hydroxycortisol(6p-OHC)/cortisol ratio, among other factors would partially explain such variability. Materials and Methods: Fifty three patientsaged>18years with respiratorydisease treated with CLA were included in the study. An average of 3 blood samples per patient were obtained at approximately the followingTimes After Dosing (TAD): 0.5,1.25,2,3,4,6,9 and 12 h. Clarithromycin was given orally or i.v., twice daily at the dose of 500 mg. Around the same times at which blood samples were collected, one urine sample was obtained for determining the 6p-OHC/cortisol ratio. The serum concentration vs time data of CLA were modeled using the population approach with NONMEM 7.2. Results: A one-compartment disposition model with first-order rate ofabsorption and concentration independent distribution and elimination provided a reasonable description of the data. Absolute bioavailability of CLA was not different from 1 (p>0.05). The population estimate of total clearance was 14.6 L h_l, lower than that reported previously for healthy volunteers. Final population model included body weight as the unique covariate affecting the apparent volume of distribution. Conclusion: The study population showed a total clearance lower than that reported for healthy volunteers from other countries, probably due to the low activity of CYP3A determined in this population. However, the CYP3A activity level did not result as a significative covariable of the CLA total clearance.
KW - 6p-OHC/cortisol ratio
KW - CYP3A
KW - Clarithromycin
KW - Population pharmacokinetics
KW - TAD
UR - http://www.scopus.com/inward/record.url?scp=85006372355&partnerID=8YFLogxK
U2 - 10.3923/ijp.2017.54.63
DO - 10.3923/ijp.2017.54.63
M3 - Artículo
SN - 1811-7775
VL - 13
SP - 54
EP - 63
JO - International Journal of Pharmacology
JF - International Journal of Pharmacology
IS - 1
ER -