Alternatives to Zirgan If You Can't Fill Your Prescription

Zirgan (ganciclovir ophthalmic gel 0.15%) is considered one of the best treatments available for acute herpetic keratitis, but it isn't always easy to find in stock. If your pharmacy doesn't carry it, you have options — and acting quickly is important. Untreated herpes simplex virus keratitis can progress and cause corneal scarring that may permanently affect your vision.

Here are the most clinically relevant alternatives to Zirgan, with their advantages, limitations, and typical costs.

1. Trifluridine 1% Ophthalmic Solution (Generic Viroptic)

Trifluridine (the generic for Viroptic) is the most widely available topical antiviral alternative to Zirgan. It's FDA-approved for herpetic keratitis and has been used for decades. Generic trifluridine is stocked at most retail pharmacies across the US.

Dosage: 1 drop in the affected eye every 2 hours while awake (maximum 9 drops/day) until the ulcer heals; then 1 drop every 4 hours while awake for 7 more days.

Pros: Widely available, lower cost with generic, equally effective in clinical trials.

Cons: More frequent dosing (up to 9 drops/day vs 5 for Zirgan); higher risk of ocular surface toxicity with prolonged use; not selective for virus-infected cells.

Cost: Generic trifluridine typically costs $30–$80 per bottle with common discount cards — significantly less expensive than Zirgan without insurance.

2. Oral Acyclovir (Zovirax — Generic Available)

Oral acyclovir is widely available in generic form and is highly effective for herpetic eye infections, particularly for stromal keratitis (deeper corneal involvement) and as adjunctive therapy. It can serve as a bridge therapy while you locate Zirgan or as an alternative if topical agents are unavailable.

Dosage: 400 mg taken five times per day for 10–14 days for active epithelial keratitis.

Pros: Available at virtually any pharmacy, inexpensive ($10–$30 generic), no eye drops required, systemic coverage.

Cons: Five-times-daily dosing can be inconvenient; oral acyclovir ophthalmic ointment is not commercially available in the US; less targeted to the ocular surface than topical therapy.

3. Oral Valacyclovir (Valtrex — Generic Available)

Valacyclovir is the prodrug of acyclovir, meaning the body converts it into acyclovir after you take it. It requires less frequent dosing than acyclovir and is widely available as a generic.

Dosage: 500 mg three times per day for herpetic keratitis.

Pros: More convenient dosing than acyclovir, generic available at low cost ($10–$30), available at any pharmacy.

Cons: Same limitations as oral acyclovir — not a direct topical replacement for ocular surface infection.

4. Oral Famciclovir (Famvir — Generic Available)

Famciclovir is another oral antiviral in the same class. It's sometimes used for herpetic eye infections, particularly in patients who don't tolerate acyclovir or valacyclovir well.

Dosage: 250 mg three times per day.

Which Alternative Is Best for You?

The right alternative depends on your specific situation:

For a direct topical replacement: Trifluridine 1% ophthalmic solution is the closest substitute. It treats the same condition, targets the ocular surface directly, and is widely available at retail pharmacies.

For the most affordable option: Generic oral acyclovir costs as little as $10–$30 and is available everywhere.

For easiest dosing: Oral valacyclovir (500 mg three times per day) is the most convenient oral option.

Always discuss with your prescribing ophthalmologist or optometrist before switching medications. Herpetic keratitis has multiple forms (epithelial, stromal, endothelial) and the best treatment depends on which layer of the cornea is involved.

Still Want to Find Zirgan? Let medfinder Help

If you'd still prefer to fill your original Zirgan prescription, medfinder can call pharmacies near you to find who has it in stock. Read more in our guide: How to Find Zirgan In Stock Near You.