Alternatives to Valacyclovir If You Can't Fill Your Prescription

Valacyclovir (brand name Valtrex) is the go-to antiviral for cold sores, genital herpes, and shingles. But what happens when your pharmacy is temporarily out of stock, your insurance won't cover it, or you're dealing with an access issue? The good news: you have real, clinically proven alternatives.

This guide breaks down the main alternatives to Valacyclovir — how they compare in effectiveness, dosing, side effects, and cost — so you can have an informed conversation with your doctor.

Why Would You Need a Valacyclovir Alternative?

There are several common scenarios where an alternative to Valacyclovir makes sense:

Your pharmacy is temporarily out of stock

Your insurance doesn't cover Valacyclovir and the cash price is too high

You've had side effects from Valacyclovir and want to try something different

You have a rare allergy to valacyclovir or acyclovir

Always talk to your doctor before switching antivirals. Dose equivalencies are not always 1:1, and not every alternative covers every indication.

Alternative #1: Acyclovir (Zovirax) — The Original Antiviral

Acyclovir is the drug that Valacyclovir converts into inside your body. In fact, Valacyclovir was designed specifically to improve acyclovir's poor oral absorption — it delivers 3 to 5 times more acyclovir into your bloodstream than taking acyclovir directly.

Despite that, acyclovir works equally well for most indications when dosed properly. The main trade-off is more frequent dosing.

Dosing comparison for genital herpes (suppressive therapy):

Valacyclovir: 500 mg once daily

Acyclovir: 400 mg twice daily

Dosing comparison for shingles:

Valacyclovir: 1g three times daily for 7 days

Acyclovir: 800 mg five times daily for 7 days

Cost: Acyclovir is typically the least expensive option. GoodRx prices for generic acyclovir start around $10 for a 30-day supply, compared to about $19 for generic Valacyclovir with a discount card.

Best for: Patients on a tight budget, long-term suppressive therapy, or those who can manage a more frequent dosing schedule.

Alternative #2: Famciclovir (Famvir) — The Three-Times-a-Day Option

Famciclovir is a prodrug of penciclovir — another antiviral in the same drug class as acyclovir. Like Valacyclovir, it has good oral bioavailability and requires less frequent dosing than acyclovir.

Studies comparing famciclovir and valacyclovir show essentially equivalent efficacy for cold sores and genital herpes. A large meta-analysis found both were highly effective at reducing shingles pain, with famciclovir ranking slightly better for long-term nerve pain prevention.

Typical dosing for shingles: 500 mg three times daily for 7 days

Typical dosing for recurrent genital herpes: 1,000 mg twice daily for 1 day (single-day therapy)

Cost: Generic famciclovir typically runs $15-$40 with a discount card, depending on the quantity. It's more expensive than acyclovir but comparable to Valacyclovir.

One caution: Famciclovir is not as widely stocked at pharmacies as Valacyclovir. Some pharmacies carry minimal inventory. Check availability before switching.

Alternative #3: Topical Penciclovir Cream (Denavir) — For Cold Sores Only

Penciclovir 1% cream (brand name Denavir) is a topical prescription antiviral applied directly to a cold sore every 2 hours while awake. It's only for cold sores on the lips and face — not for genital herpes or shingles.

Studies show penciclovir cream shortens cold sore healing time by about half a day to a full day compared to no treatment. It's less effective than oral antivirals for most people, but is an option if you cannot take oral medications.

Alternative #4: Docosanol (Abreva) — OTC for Cold Sores

Docosanol 10% cream (Abreva) is the only FDA-approved over-the-counter treatment for cold sores. It works by a different mechanism — blocking the virus from entering healthy cells — rather than inhibiting viral DNA replication.

Abreva is less potent than prescription antivirals, but is readily available at any pharmacy without a prescription. It's a reasonable bridge option for mild cold sores while you locate Valacyclovir.

Side-by-Side Comparison: Valacyclovir vs. Alternatives

Valacyclovir: 1-3x daily dosing, treats all herpes infections, generic ~$19+ with discount card, excellent bioavailability

Acyclovir: Up to 5x daily dosing, treats all herpes infections, generic ~$10+ with discount card, lower bioavailability but same efficacy

Famciclovir: 2-3x daily dosing, treats all herpes infections, generic ~$15-$40 with discount card, may be harder to find at pharmacy

Penciclovir cream: Topical only, cold sores only, prescription, applied every 2 hours

Docosanol (Abreva): OTC topical, cold sores only, no prescription needed, less potent

Can't Find Any Antiviral? Here's What to Do Right Now

Before giving up on Valacyclovir, use medfinder to check which pharmacies near you currently have it in stock. See also: How to Find Valacyclovir in Stock Near You.

If you truly cannot fill any prescription antiviral and have an active outbreak, call your doctor or urgent care. They may have samples available or can recommend a telehealth service that can send medication to a pharmacy near you within hours.