The pharmacokinetic and safety profiles of zanamivir after single and repeat intravenous administration in healthy Japanese males.

Abstract:

WHAT IS KNOWN AND OBJECTIVE:Neuraminidase inhibitors are important options for the treatment of infection by the influenza virus. For the treatment of severe influenza, parenteral administration of a neuraminidase inhibitor may be desirable. This study was conducted to evaluate the pharmacokinetic and safety profiles of intravenous zanamivir, an influenza viral neuraminidase inhibitor, in Japanese subjects to further characterize these profiles particularly following relatively high-doses when compared with inhalation doses and to provide reassurance that there are no marked differences with profiles reported for other ethnically different populations. METHODS:Single doses of 100, 300, 600 mg zanamivir were administered to healthy Japanese men in a randomized, double-blind, ascending dose, placebo-controlled, incomplete three-period cross-over study. In period 3, subjects were given 600 mg of zanamivir on day 1, followed by a 60 h washout period and then a 5-day course of 600 mg zanamivir twice daily. Each subjects received two of three active dosages of zanamivir from 100, 300 and 600 mg, and placebo. RESULTS:Adverse events reported in the study were all mild in intensity and resolved without any treatment. The mean AUC0-∞ values after single intravenous administration of 100, 300 and 600 mg were 16768, 53462 and 100400 ng·h/mL, respectively, demonstrating dose proportionality. No accumulation or time variance was observed after 5 days of twice-daily administration of 600 mg zanamivir. Urinary concentrations of zanamivir after single doses ranging from 100 to 600 mg indicated that over 94% of the zanamivir administered was excreted in urine within 24 h. WHAT IS NEW AND CONCLUSION:Single and 5-day BID repeat dosing of 600 mg were safely administered in Japanese healthy subjects. The pharmacokinetic profile of zanamivir after intravenous administration was consistent with previously reported findings in non-Japanese subjects.

journal_name

J Clin Pharm Ther

authors

Shida Y,Hara K,Nohda S,Soutome T,Hirama T

doi

10.1111/jcpt.12056

subject

Has Abstract

pub_date

2013-06-01 00:00:00

pages

236-40

issue

3

eissn

0269-4727

issn

1365-2710

journal_volume

38

pub_type

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