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A randomized, double-blind study was conducted to evaluate the safety and pharmacokinetics of acyclovir following multiple-dose oral administration of valaciclovir (three times a day for 8 days) in geriatric volunteers (65 to 83 years of age). Pharmacokinetic evaluation was performed for three groups: normotensive subjects given 500-mg doses of valaciclovir (n = 11), normotensive subjects given, 1,000-mg doses of valaciclovir (n = 9), and thiazide diuretic-treated hypertensive subjects given 500-mg doses of valaciclovir (n = 9). Valaciclovir, the l-valyl ester of acylclovir, was rapidly absorbed and converted to acyclovir, with plasma valaciclovir concentrations generally undetectable or   75 ml/min/1.73 m2), the elderly subjects (CLCR = 40 to 65 ml/min/1.73 m2) showed higher (approximately 15 to 20%) mean Cmaxs and higher (approximately 30 to 50%) mean AUC(0-infinity)s of acyclovir (P &lt; 0.01), which were consistent with age-related decreases in CLCR. The increased acyclovir exposure from valaciclovir dosing will permit reduced dosing frequency and may result in improved efficacy in the management of herpesvirus diseases.

Pharmacokinetics and safety of multiple-dose valaciclovir in geriatric volunteers with and without concomitant diuretic therapy