title: Pharmacokinetics of amlodipine and olmesartan after administration of amlodipine besylate and olmesartan medoxomil in separate dosage forms and as a fixed-dose combination.
abstract: The pharmacokinetics of amlodipine and olmesartan in healthy volunteers after coadministration of amlodipine besylate and olmesartan medoxomil concomitantly as separate dosage forms and together in a fixed-dose combination tablet were characterized in 5 phase I, randomized, crossover studies. The mean steady-state pharmacokinetics of amlodipine and olmesartan were similar when olmesartan medoxomil 40 mg/day and amlodipine 10 mg/day were administered separately or concomitantly for 10 days. The total and maximum exposure to amlodipine and olmesartan after administration of fixed-dose combination amlodipine/olmesartan medoxomil 10 mg/40 mg was bioequivalent to amlodipine 10 mg plus olmesartan medoxomil 40 mg. The ratio of least squares mean and 90% confidence intervals for the area under the drug concentration-time curve from time zero to time t, from time zero to infinity, and the maximum observed plasma drug concentration of amlodipine and olmesartan fell within the prespecified range for bioequivalence (80.0% - 125.0%). The area under the drug concentration-time curve from time zero to time t, from time zero to infinity, and the maximum observed plasma drug concentration of both drugs also met the prespecified criterion for bioequivalence when the fixed-dose combination tablet was taken 30 minutes after a high-fat breakfast. Total exposure to amlodipine and olmesartan was dose-proportional after administration of olmesartan medoxomil 10 mg to 40 mg in the fixed-dose combination formulation with amlodipine 5 mg to 10 mg. From a pharmacokinetic perspective, the 2 drugs are well suited to coadministration in a fixed-dose combination.
authors.affiliation: Daiichi Sankyo Pharma Development, 399 Thornall Street, Edison, NJ 08837, USA. srohatagi@dsus.com
authors.forename: Shashank
authors.initials: S
authors.lastname: Rohatagi
authors.forename: James
authors.initials: J
authors.lastname: Lee
authors.forename: Magdy
authors.initials: M
authors.lastname: Shenouda
authors.forename: Stephen
authors.initials: S
authors.lastname: Haworth
authors.forename: Mohinder Singh
authors.initials: MS
authors.lastname: Bathala
authors.forename: Mark
authors.initials: M
authors.lastname: Allison
authors.forename: Igor
authors.initials: I
authors.lastname: Rubets
authors.forename: Reinilde
authors.initials: R
authors.lastname: Heyrman
authors.forename: Robert
authors.initials: R
authors.lastname: Noveck
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Salazar
mesh_terms: D000293:Adolescent; D000328:Adult; D017311:Amlodipine / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics*; D047228:Angiotensin II Type 1 Receptor Blockers / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics*; D001682:Biological Availability; D002121:Calcium Channel Blockers / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics*; D017321:Clinical Trials, Phase I as Topic; D004338:Drug Combinations; D004347:Drug Interactions; D006801:Humans; D007093:Imidazoles / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics*; D008875:Middle Aged; D000068557:Olmesartan Medoxomil; D016032:Randomized Controlled Trials as Topic; D013777:Tetrazoles / Q000008:administration & dosage / Q000009:adverse effects / Q000493:pharmacokinetics*; D013810:Therapeutic Equivalency; D055815:Young Adult
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D002121:Calcium Channel Blockers; D004338:Drug Combinations; D007093:Imidazoles; D013777:Tetrazoles; D017311:Amlodipine; D000068557:Olmesartan Medoxomil; C437965:olmesartan