Zirgan
Zirgan is a topical antiviral eye medication containing ganciclovir that is specifically formulated as an ophthalmic gel for treating eye infections. It is primarily prescribed for acute herpetic keratitis, a corneal infection caused by herpes simplex virus. This brand-name medication is applied directly to the eye to reduce healing time and prevent worsening of the viral infection.
Zirgan is a prescription antiviral eye gel used to treat herpes simplex virus infections of the cornea.
Key facts at a glance
- RxNorm
- 864647
- Generic
- Zirgan
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Zirgan is indicated for the treatment of acute herpetic keratitis (herpes simplex virus type 1 infection of the cornea), commonly known as viral eye ulcers or eye herpes.
Ganciclovir, the active ingredient in Zirgan, is a nucleoside analog that inhibits viral DNA synthesis. It works by competing with natural nucleotides for incorporation into viral DNA, ultimately halting viral replication in the affected eye tissue.
Zirgan is for topical ophthalmic use only. Patients should wash hands before application and avoid contaminating the dropper tip. Contact lenses should typically be removed before instilling the gel. Common side effects may include eye redness, blurred vision, and mild eye irritation. As with all antiviral medications, treatment should begin as early as possible for best outcomes.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy