Background: Acyclovir, a specific and selective inhibitor of replication of herpesviridae family, has well documented efficacy for speedy rash healing and decreasing pain of herpes zoster. Limited oral bioavailability of acyclovir requires frequent dosing. Valacyclovir is rapidly and almost completely converted to acyclovir in vivo and gives three to fivefold increase in acyclovir bioavailabili...

A new, simple and sensitive spectrophotometric method for the determination of valacyclovir and cefotaxime has been developed. The method is based on the condensation of valacyclovir and cefotaxime with 1, 2napthaquinone-4sulfonic acid sodium (NQS) in alkaline media to yield orange colored products respectively. Valacyclovir and cefotaxime showed maximum absorbance at 495nm and 475nm with linea...

OBJECTIVE To compare valacyclovir hydrochloride with acyclovir in the treatment of recurrent genital herpes infection. DESIGN A multicenter, double-blind, placebo-controlled, randomized, parallel-design study. SETTING University clinics (dermatology, gynecology, and infectious diseases) and private practices. PATIENTS One thousand two hundred patients with recurrent genital herpes simplex...

INTRODUCTION Mathematical models that incorporate HIV disease progression dynamics can estimate the potential impact of strategies that delay HIV disease progression and reduce infectiousness for persons not on antiretroviral therapy (ART). Suppressive treatment of HIV-positive persons co-infected with herpes simplex virus-2 (HSV-2) with valacyclovir, an HSV-2 antiviral, can lower HIV viral loa...

Oral valacyclovir for cytomegalovirus (CMV) prophylaxis in bone marrow transplantation (BMT) was investigated in a randomized, double-blind, acyclovir-controlled, multicenter clinical trial in recipients of allogeneic BMT who were CMV seropositive (or donor positive) before transplantation and were aged 13 years or older. Patients were randomized before BMT. All initially received intravenous a...

BACKGROUND Valacyclovir exhibits better oral absorption and higher, more prolonged serum concentrations than oral acyclovir. The efficacy of valacyclovir and acyclovir on genital herpes simplex virus (HSV) shedding was assessed in a double-blind, 3-period crossover trial. METHODS Sixty-nine immunocompetent participants with genital HSV-2 received oral valacyclovir, acyclovir, and matching pla...

BACKGROUND In patients with multiple myeloma (MM), bortezomib is associated with a significant risk of Varicella zoster virus (VZV) reactivation. There are some reports that acyclovir reduces the risk of VZV reactivation. We assessed whether VZV reactivation could be reduced by using prophylactic valacyclovir at a dose of 500 mg daily. PATIENTS AND METHODS We retrospectively evaluated 32 pati...

Variability in valacyclovir bioavailability and the potential for cephalexin-valacyclovir interaction were evaluated. The intraindividual acyclovir area under the concentration-time curve (AUC) varied minimally, whereas interindividual differences were substantial. Coadministration of the human peptide transporter 1 (hPEPT1) substrates valacyclovir and cephalexin minimally reduced the acyclovir...

Drug-related eruptions that appear only on intertriginous or flexural folds and in gluteal areas have recently been termed symmetrical drug-related intertriginous and flexural exanthema (SDRIFE). We report a case of a 56-year-old woman with acute erythematous rash in the intertriginous areas after treatment with the L-valine ester of acyclovir, valacyclovir. Oral-challenge tests resulted in ery...

The purpose of this study was to quantitatively determine the contribution of PepT1 [peptide transporter 1 (SLC15A1)] to the intestinal permeability of valacyclovir, an ester prodrug of the antiviral drug acyclovir. In situ single-pass intestinal perfusions were employed (pH 6.5 3 90 minutes) to assess the effective permeability (Peff) of 100 mM [ H]valacyclovir in wild-type and PepT1 knockout ...