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Ganciclovir: uses, dosing, side effects & brands

Ganciclovir is a cytomegalovirus nucleoside analog dna polymerase inhibitor sold in the U.S. under 3 brand and generic names, for aids-related opportunistic infections and cytomegalovirus retinitis. Below: what the FDA label says, every product that contains it, what the pills look like, and its recall record.

By the pharmaranks editorial teamReviewed against the FDA (openFDA label, NDC Directory & Enforcement) sourcesUpdated Jul 24, 2026How we research

Key facts

Drug class
Cytomegalovirus Nucleoside Analog Dna Polymerase Inhibitor
Treats (across its forms)
Aids-Related Opportunistic Infections and Cytomegalovirus Retinitis
Available as
Capsule · Injectable · Implant · Topical
Sold as
3 products — Cytovene, Vitrasert and Zirgan
Prescription?
Prescription only
Generic available?
Not in our catalog

How Zirgan is dosed

From the FDA label for Zirgan (application NDA022211). Other ganciclovir products — different forms, different strengths — are dosed differently. Follow the label for the one you were prescribed.

The recommended dosage is 1 drop in the affected eye 5 times per day (approximately every 3 hours while awake) until the corneal ulcer heals, and then 1 drop 3 times per day for 7 days. Apply 1 drop in the affected eye 5 times per day (approximately every 3 hours while awake) until the corneal ulcer heals, and then 1 drop 3 times per day for 7 days. ( 2 )

Everything below is the FDA label for Zirgan (topical). Ganciclovir is also sold as capsule, injectable and implant, and those are different medicines to take — follow the label for the one you were prescribed.

Zirgan side effects

Most common adverse reactions reported in patients were blurred vision (60%), eye irritation (20%), punctate keratitis (5%), and conjunctival hyperemia (5%). Most common adverse reactions were blurred vision (60%), eye irritation (20%), punctate keratitis (5%), and conjunctival hyperemia (5%). ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Bausch & Lomb Incorporated, at 1-800-553-5340 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Who shouldn’t take Zirgan

None. None.

Every ganciclovir product we track (3)

Same active ingredient — different manufacturer, form, price and FDA recall record. That last one is what our independent score measures.

Ganciclovir products
#DrugRatingPharmacy pays
1
Cytovene
Not yet rated—View →
2
Vitrasert
Not yet rated—View →
3
Zirgan
Not yet rated—View →

How long ganciclovir keeps

The date on a sealed pack is not the only one: some ganciclovir labels start a second clock once the product is opened or mixed, as short as 24 hours.

Does ganciclovir expire? The in-use limits and storage rules from its labels

Ganciclovir and breastfeeding

From LactMed, the US National Library of Medicine’s Drugs and Lactation Database — quoted, not rewritten.

Several factors might affect the decision to use ganciclovir in a nursing mother. No information is available on the clinical use of ganciclovir during breastfeeding. Cytomegalovirus (CMV) can be transmitted to infants though breastmilk, with preterm and immunocompromised infants at greatest risk. No information is available on any changes in the risk of transmission if the mother is being treated with ganciclovir. Although the manufacturer recommends avoiding breastfeeding during ganciclovir use because of the risk of infant drug toxicity, neonates with CMV infections are often treated directly with ganciclovir.

Full LactMed record for ganciclovir: levels in milk, effects in breastfed infants, and the drugs it would consider instead

National Institute of Child Health and Human Development, record revised February 15, 2026. LactMed states its information is not a substitute for professional judgement.

What people report to the FDA about ganciclovir

The FDA Adverse Event Reporting System (FAERS) collects reports from patients and clinicians. It holds 10,753 reports naming ganciclovir, and the FDA flagged 97% of those reports as serious. The effects reported most often — leaving out reports about overdose, misuse or the condition being treated, which dominate the raw list for common medicines:

  • cytomegalovirus infection1,308 reports
  • drug resistance745 reports
  • pyrexia634 reports
  • neutropenia592 reports
  • pancytopenia556 reports
  • diarrhoea465 reports
  • cytomegalovirus viraemia460 reports
  • pneumonia447 reports

Read these as a signal, not a rate. A report does not mean ganciclovir caused the effect — anyone can file one, and many describe people taking several medicines for several conditions. Crucially there is no denominator: FAERS does not record how many people took the drug, so these counts cannot be turned into “X% of patients” — a bigger number often just means a more widely used or more talked-about drug. Duplicates exist, and publicity drives reporting. For what is actually established, read the FDA label section above.

Source: openFDA drug/event (FAERS), retrieved July 25, 2026.

Related calculators

How long it stays in your system →

Frequently asked questions

What is Zirgan?

ZIRGAN (ganciclovir ophthalmic gel) 0.15% contains ganciclovir, a nucleoside analog antiviral. ZIRGAN is a sterile, preserved, clear, colorless, ophthalmic gel for topical ophthalmic use.

What kind of drug is ganciclovir?

The FDA classifies ganciclovir as a cytomegalovirus nucleoside analog dna polymerase inhibitor. If you are checking whether it is safe to combine with something else, the class is what matters — two drugs from the same class usually should not be stacked.

Can you take ganciclovir with other medicines?

It depends on the medicine. We check it against the FDA labels rather than guessing: our interaction checker searches each drug's own label for the other and quotes what it says, naming the section it came from. Run ganciclovir against whatever else you take — and remember that a label not naming a drug is not the same as that combination being safe.

What brand names is ganciclovir sold under?

We track 3 ganciclovir-containing products in the U.S.: Cytovene, Vitrasert and Zirgan. They are the same active ingredient; they differ in form, manufacturer, price and FDA recall record.

What forms does ganciclovir come in?

Across the brands we track, ganciclovir is currently marketed as capsule, injectable, implant and topical, per the FDA's National Drug Code Directory. Each form is dosed differently — follow the label for the exact product you were prescribed.

Is there a generic ganciclovir?

We do not currently list a generic-labelled ganciclovir product. That does not always mean none exists — it means none appears under a generic name in the FDA data we track. Ask your pharmacist.

Cite this page
APA
pharmaranks. (2026, July 24). Ganciclovir: uses, dosing, side effects & brands. https://pharmaranks.com/drugs/ganciclovir
MLA
“Ganciclovir: uses, dosing, side effects & brands.” pharmaranks, 24 July 2026, https://pharmaranks.com/drugs/ganciclovir.

We summarise public FDA and NIH sources — for a clinical claim, cite the primary source we link to as well.

Sources: FDA openFDA drug label, National Drug Code Directory, and Enforcement (recall) database. This page reproduces public FDA data and is not medical advice. Dosing is set by your prescriber.

Read the full FDA label for ganciclovir on DailyMed (NIH) ↗.