title: Entecavir pharmacokinetics, safety, and tolerability after multiple ascending doses in healthy subjects.
abstract: A double-blind, placebo-controlled, multiple oral dose escalation study was conducted to investigate the pharmacokinetics, safety, and tolerability of entecavir in healthy subjects. Eight subjects were assigned to each of the 3 dose panels (0.1 mg, 0.5 mg, and 1 mg or matched placebo once daily for 14 days). Blood and urine samples were collected for pharmacokinetic analyses. Entecavir was rapidly absorbed, with peak plasma concentration occurring within 1 hour of dosing. Steady-state plasma concentrations of entecavir were achieved by 10 days following the initial dose. At steady state, the mean area under the plasma concentration-time curve over 1 dosing interval, increased approximately proportional to dose. Entecavir had a mean terminal half-life ranging from 128 to 149 hours and an effective half-life of approximately 24 hours. Elimination was predominantly through renal excretion, with mean urinary recovery ranging from 62% to 73%. Entecavir was safe and well tolerated when administered at doses ranging from 0.1 mg to 1 mg/d for 14 days.
authors.affiliation: Bristol-Myers Squibb, Princeton, NJ 08543-4000, USA.
authors.forename: Jing-He
authors.initials: JH
authors.lastname: Yan
authors.forename: Marc
authors.initials: M
authors.lastname: Bifano
authors.forename: Steven
authors.initials: S
authors.lastname: Olsen
authors.forename: Robert A
authors.initials: RA
authors.lastname: Smith
authors.forename: Duxi
authors.initials: D
authors.lastname: Zhang
authors.forename: Dennis M
authors.initials: DM
authors.lastname: Grasela
authors.forename: Frank
authors.initials: F
authors.lastname: LaCreta
mesh_terms: D000328:Adult; D000998:Antiviral Agents / Q000008:administration & dosage / Q000009:adverse effects* / Q000097:blood / Q000493:pharmacokinetics*; D004305:Dose-Response Relationship, Drug; D006147:Guanine / Q000008:administration & dosage / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D000998:Antiviral Agents; C413685:entecavir; D006147:Guanine