Valacyclovir Dosing and Administration Guidelines

Standard Dosing for Normal Renal Function

The Centers for Disease Control and Prevention recommends 1 gram orally twice daily for 7-10 days for genital herpes first episode, with treatment most effective when started within 48 hours of symptom onset 1
For recurrent genital herpes episodes, the Centers for Disease Control and Prevention suggests 500 mg orally twice daily for 5 days, with an alternative regimen of 1 gram once daily for 5 days 2
The Centers for Disease Control and Prevention recommends 1 gram orally once daily for suppressive therapy in patients with ≥10 recurrences per year, and 500 mg orally once daily for those with <10 recurrences per year 2

The Centers for Disease Control and Prevention advises dose adjustments for patients with renal impairment, with a recommended dose of 1 gram every 12 hours for herpes zoster in patients with CrCl 30-49 mL/min 3
For patients with CrCl 10-29 mL/min, the Centers for Disease Control and Prevention recommends 1 gram every 24 hours for herpes zoster, and 500 mg every 24 hours for genital herpes (recurrent) 3

The Centers for Disease Control and Prevention warns against valacyclovir 8 grams per day in immunocompromised patients due to the risk of thrombotic thrombocytopenic purpura/hemolytic uremic syndrome (TTP/HUS) 1
The Centers for Disease Control and Prevention notes that TTP/HUS has been reported in HIV-infected patients on high-dose therapy but not at standard HSV treatment doses 4, 5

The Centers for Disease Control and Prevention states that no routine laboratory monitoring is needed for patients with normal renal function receiving episodic or suppressive therapy 4, 5, 3
The Centers for Disease Control and Prevention emphasizes that renal function monitoring is mandatory in patients with substantial renal impairment 4, 5

The Centers for Disease Control and Prevention recommends continuing episodic therapy until lesions completely heal, and discussing discontinuation of suppressive therapy after 1 year to reassess recurrence frequency 2, 4, 5
The Centers for Disease Control and Prevention suggests suspecting acyclovir resistance if lesions do not begin to resolve within 7-10 days, and using IV foscarnet 40 mg/kg every 8 hours as the treatment of choice for resistant HSV 1, 4, 5

The Centers for Disease Control and Prevention recommends using twice-daily regimens (500 mg twice daily) for suppressive therapy in HIV-infected patients, and avoiding short-course therapy (1-3 days) 4, 5
The American Geriatrics Society notes that exposure to acyclovir is enhanced in elderly patients due to decreased glomerular filtration, and emphasizes the importance of dose adjustment based on creatinine clearance 6, 7

Patients with pre-existing renal impairment, hypertension, or diabetes should have baseline renal function documented, as recommended by Clinical Gastroenterology and Hepatology guidelines 8
Concurrent nephrotoxic medications, dehydration, or other conditions that could compromise renal function require monitoring, according to Clinical Gastroenterology and Hepatology guidelines 8

If clinical deterioration occurs or new symptoms develop suggesting renal dysfunction, BMP should be checked, as suggested by Clinical Gastroenterology and Hepatology guidelines 8