If you have genital herpes, you have two ways to use antiviral medication. You can take a pill every day to prevent outbreaks (suppressive therapy), or you can take a short course only when an outbreak starts (episodic therapy). Both use the same antiviral drugs. They do different jobs. The right choice depends on how often you get outbreaks, whether you have a partner you want to protect, and what fits your life.
This post lays out what each approach actually does so you can have a useful conversation with a prescriber.
What episodic therapy does
Episodic therapy means you keep a short course of an antiviral on hand and start it the moment an outbreak begins. The goal is to shorten that specific outbreak, not to prevent future ones.
Timing is the whole game. The medication works by blocking viral replication, and replication is heaviest at the very start of an outbreak. If you start at the first sign of tingling, itching, or burning (the prodrome) or within the first day of a visible sore, you can cut a few days off the outbreak. Start it on day three and you have largely missed the window.
Typical valacyclovir regimens for genital herpes are 1 gram once daily for five days, or 500 mg twice daily for three days. For cold sores the dose is higher and shorter: 2 grams twice daily for one day.
Episodic therapy makes sense when:
- Your outbreaks are infrequent (a common informal line is fewer than six per year).
- You can recognize your prodrome reliably and start fast.
- You are not focused on lowering transmission risk to a partner between outbreaks.
What suppressive therapy does
Suppressive therapy means one pill every day, whether or not you have symptoms. For genital herpes the standard valacyclovir dose is 500 mg once daily, stepped up to 1 gram once daily for people with 10 or more recurrences per year.
Daily suppression does three things episodic treatment cannot.
It cuts outbreak frequency by roughly 70 to 80 percent. Many people on suppression go from monthly outbreaks to one or two a year, or none.
It reduces asymptomatic shedding. Herpes can be present on the skin and transmissible even when you have no symptoms and no visible sore. This subclinical shedding is responsible for a large share of transmission. Daily antiviral lowers how often it happens, which is the mechanism behind the per-year transmission numbers in discordant couples.
It lowers transmission risk to a partner. In the landmark trial by Corey and colleagues, once-daily valacyclovir 500 mg cut the rate of partner HSV-2 acquisition to about half that seen on placebo over eight months (Corey et al., NEJM 2004). It does not eliminate the risk. It reduces it.
Suppressive therapy makes sense when:
- You get frequent or bothersome outbreaks.
- You have a partner who does not have herpes and you want to lower their risk.
- Outbreaks disrupt your work, sex life or mental health enough that prevention beats treatment.
The transmission point matters more than people expect
If you are choosing mainly to protect a partner, this is the deciding factor. Episodic therapy does almost nothing for transmission risk, because most transmission happens during asymptomatic shedding between outbreaks, not during a visible outbreak you would treat. Daily suppression is the only one of the two that addresses that.
Suppression works best as one layer of protection alongside others. The CDC and standard practice pair daily antiviral with condom use and with disclosure plus avoiding sex during prodrome or an active outbreak (CDC STI Treatment Guidelines, 2021). Each layer adds something. None of them alone gets you to zero.
Cost and convenience
Valacyclovir is generic and inexpensive in both approaches. Episodic therapy uses fewer pills per year if your outbreaks are rare, so it can cost less for someone with two outbreaks annually. Suppression is 365 pills a year, but at generic prices the difference is usually modest.
Convenience cuts the other way for some people. Remembering a daily pill is a burden if you are not used to it. Remembering to keep an episodic course filled and starting it fast enough is a different kind of burden. Neither is obviously easier; it depends on you.
You are not locked in
This is not a permanent decision. Recurrence rates tend to fall over the years after a first infection, so someone who needed daily suppression early on may do fine on episodic treatment later. A reasonable plan is to reassess at least once a year, and a trial off daily therapy is a normal thing to try when outbreaks have quieted down. People also switch the other way, moving from episodic to suppressive when they start a new relationship and want to lower transmission risk.
How to decide
Ask yourself three questions:
- How many outbreaks do I get in a year, and how much do they bother me?
- Do I have a partner without herpes whose risk I want to lower?
- Would a daily pill or a kept-ready short course fit my habits better?
Frequent or bothersome outbreaks, or a transmission concern, point toward daily suppression. Rare outbreaks with no transmission concern point toward episodic treatment. Many people land somewhere in between and the call comes down to preference, which is a legitimate basis for the decision.
Medically reviewed by: [Reviewer name, credentials] — [Date]
If you are weighing daily versus episodic treatment, a licensed clinician can review your outbreak history and your goals and help you pick. Start an online visit.
This article is for general education and is not a substitute for personalized medical advice from a licensed clinician.