Standard Valtrex Dose for Shingles
Valtrex (valacyclovir) treats shingles (herpes zoster) with 1 gram taken orally three times daily for 7 days. Start treatment as soon as possible, ideally within 72 hours of rash onset, for best results.[1]
How to Take It
Take each 1-gram dose with or without food, spaced about 8 hours apart (e.g., morning, afternoon, evening). Swallow tablets whole; do not crush or chew. Drink plenty of water to stay hydrated and reduce kidney risks.[1][2]
Dose Adjustments for Kidney Issues
Patients with reduced kidney function need lower doses to avoid buildup:
- Creatinine clearance 30-49 mL/min: 1 gram every 12 hours for 7 days.
- Creatinine clearance 10-29 mL/min: 1 gram every 24 hours for 7 days.
- Creatinine clearance <10 mL/min: 500 mg every 24 hours for 7 days.
Dialysis patients take 500 mg after each session. Doctors calculate based on lab tests.[1]
What If You Miss a Dose?
Take it as soon as you remember, unless the next dose is within 2 hours. Skip and resume schedule—do not double up.[2]
Why This Dose Works for Shingles
Valtrex converts to acyclovir in the body, which stops the varicella-zoster virus from replicating. The high-dose, short-course regimen targets the acute phase to speed rash healing, cut pain, and lower postherpetic neuralgia risk by about 50% if started early.[1][3]
Common Side Effects Patients Report
Headache, nausea, and stomach pain affect 10-15% of users. Rare but serious: confusion, kidney problems, or seizures, especially in older adults or those with kidney disease. Stop and call a doctor for rash worsening, yellowing skin, or severe dizziness.[1][2]
How Valtrex Compares to Acyclovir for Shingles
Valtrex requires fewer pills (21 total) than acyclovir (35 pills at 800 mg five times daily for 7-10 days) due to better absorption. Both are effective, but Valtrex is often preferred for convenience.[3]
[1]: Valtrex Prescribing Information (FDA)
[2]: CDC Shingles Treatment Guidelines
[3]: UpToDate: Treatment of Herpes Zoster