Valtrex Dosage for Genital Herpes: Label Schedules
Valtrex dosage for genital herpes differs for a first episode, a recognized recurrence, daily suppression, and transmission reduction. The selected schedule also depends on symptom timing, diagnostic certainty, kidney function, pregnancy, immune status, and other medicines.
Medically reviewed
Infectious-disease specialist · antiviral therapy and medication safety
Reviewed August 27, 2026
Valtrex dosage for genital herpes depends on the treatment goal, not only the drug name. A first episode, a recognized recurrence, daily suppression, and reduction of transmission use different label schedules. The table below is a reference for a clinician discussion; it is not a personal dosing instruction.
Valtrex dosage for genital herpes by treatment goal
The current U.S. prescribing information lists the following adult schedules. A prescriber may need to use different guidance or adjust the plan after reviewing the patient. Do not combine rows, extend a course, or reuse an old prescription without clinical advice.
| Clinical situation | U.S. label schedule | Timing in the evidence | What must be individualized |
|---|---|---|---|
| Initial episode | 1 gram twice daily for 10 days | Label evidence was strongest when treatment began early after signs or symptoms appeared. | Confirm a first episode, assess severity and other STI testing, and check pregnancy, immune status, kidney function, and ability to take oral medicine. |
| Recurrent episode | 500 mg twice daily for 3 days | Start at the first sign or symptom of a recognized recurrence; effectiveness is less certain when started late. | Confirm that this matches a previously diagnosed recurrence rather than a first episode, another infection, or a complication. |
| Daily suppression, immunocompetent adult | 1 gram once daily | Taken continuously and reviewed over time, not started and stopped as an outbreak-only course. | Recurrence frequency, quality-of-life impact, HSV type, transmission concerns, kidney function, adherence, and whether suppression is still wanted. |
| Alternative suppression schedule | 500 mg once daily for patients with 9 or fewer recurrences per year | Daily suppression; CDC notes that this lower schedule may be less effective for people with frequent recurrences. | Accurate recurrence count, breakthrough symptoms, diagnosis, and the treatment goal. |
| Suppression in certain adults with HIV-1 | 500 mg twice daily | Ongoing suppression under HIV and prescribing follow-up. | Immune status, antiretroviral regimen, kidney function, other medicines, and specialist guidance. |
| Reduction of HSV-2 transmission | 500 mg once daily for the source partner with 9 or fewer recurrences per year | Daily use as one part of a prevention strategy. | Confirmed symptomatic HSV-2, partner context, recurrence history, safer-sex plan, and the limits of evidence. Medication does not eliminate transmission risk. |
Label and guideline schedules are not identical in every detail. CDC guidance, for example, gives a 7-to-10-day range for a first clinical episode and includes more than one valacyclovir option for episodic recurrent HSV-2. That is a reason to follow the prescription written for the diagnosed situation, not a reason to switch schedules independently.
Renal and timing checks for Valtrex dosage for genital herpes
First episode or recurrence?
A first episode can be prolonged or severe even when it begins mildly. A short recurrent-episode course should not be self-selected for a new or uncertain genital lesion.
HSV-1 or HSV-2?
Genital HSV-1 generally recurs and sheds less often than HSV-2. CDC recommends shared decision-making before suppressive therapy for genital HSV-1.
Kidney function and hydration
Valacyclovir is cleared through the kidneys. The label contains renal-adjustment tables; the appropriate change depends on measured kidney function and the treatment indication.
Pregnancy or immune compromise
Pregnancy, HIV, transplant medicine, chemotherapy, or other immune compromise changes the clinical context and may require condition-specific guidance or in-person care.
Practical steps before and during treatment
- Clarify the treatment goal. Ask whether the prescription is for a first episode, episodic treatment of a recurrence, daily suppression, or transmission reduction.
- Record when symptoms started. Timing matters most for episodic treatment. New lesions, pain, prodrome, fever, urinary symptoms, and previous testing help the clinician interpret the episode.
- Share the full medication and health list. Include kidney disease, dialysis, dehydration, pregnancy or breastfeeding, immune conditions, and medicines that can affect the kidneys.
- Follow the written schedule exactly. Do not double a dose, borrow tablets, combine schedules, or turn a suppressive prescription into an outbreak course without speaking to the prescriber or pharmacist.
- Plan prevention separately. Suppression can reduce—but does not remove—HSV-2 transmission risk. Condoms or other barriers and avoiding sexual activity during lesions or prodrome remain relevant.
- Reassess ongoing suppression. CDC recommends discussing each year whether continued suppression still matches recurrence frequency, preferences, and quality-of-life goals.
When not to manage this as a routine recurrence
Seek urgent medical assessment for eye pain or light sensitivity, severe headache with neck stiffness, confusion, seizure, widespread rash, inability to urinate, severe dehydration, pregnancy with a new outbreak near delivery, or symptoms suggesting a severe or disseminated infection. Get prompt help for facial swelling, breathing difficulty, blistering or peeling skin, markedly reduced urination, or new neurologic symptoms after taking valacyclovir.
A genital sore, discharge, pelvic pain, fever, or urinary symptoms can have causes other than herpes and may require examination and testing for other infections.
What treatment can and cannot do
Oral antivirals can shorten or prevent symptomatic episodes and daily suppression can reduce HSV-2 transmission in studied settings. They do not eradicate latent herpes virus. Asymptomatic shedding and transmission can still occur, and recurrence risk returns to its natural course after suppressive medicine is stopped.
Frequently asked questions
Can I use the 3-day recurrent schedule for my first genital herpes episode?
No. The short label course is for a recognized recurrent episode in an immunocompetent adult. A first or uncertain episode needs diagnosis and a clinician-selected plan.
Is 500 mg once daily always the suppressive dose?
No. The label limits that alternative to immunocompetent adults with 9 or fewer recurrences per year, and CDC notes it may be less effective for frequent recurrences. Other patient factors can also change the plan.
Does daily Valtrex make sexual transmission impossible?
No. Suppressive valacyclovir can reduce HSV-2 transmission in studied couples, but it does not eliminate risk. Safer-sex practices and avoiding sex during lesions or prodrome remain important.
Primary sources
- DailyMed: Valtrex prescribing information (current label accessed August 27, 2026)
- CDC: Herpes STI Treatment Guidelines (accessed August 27, 2026)
This information is educational and does not replace medical advice, testing, diagnosis, or an individualized prescription.