Eye Drop Expiration After Opening: Safety Guidelines

Most multi-dose eye drops should be discarded 30 days after opening unless the package insert specifies a different period. Preservative-free single-use vials must be discarded immediately after one use.

Why the Limit?

• Preservatives lose efficacy over time → bacterial/fungal contamination risk.
• Chemical degradation alters pH, osmolarity, drug potency.
• Corneal toxicity from breakdown products.

Best Practices

• Write opening date on bottle.
• Store per label (some refrigerate).
• Don’t touch dropper tip to eye, lashes, fingers.
• Discard if solution changes color, clarity, or has particles.
• When in doubt, throw it out—eye infections are serious.