Using an eye drop after its printed expiration date or after the manufacturer’s recommended “discard after opening” period is not a good idea. Eye drops need to remain sterile, and both effectiveness and sterility can become less reliable with time.
There Is No Universal 28-Day Rule
Some multidose eye drops are labeled to be discarded about 28 days after opening, but others have different instructions. Preservative-free single-use vials may need to be discarded immediately after use, while some multidose products have longer in-use periods.
The safest rule is simple: follow the exact label or package insert for that product. Do not use a generic internet timeline for every eye drop.
Why Expired or Old Eye Drops Can Be Risky
Once a bottle is opened, the dropper tip and solution can become contaminated if handled incorrectly. Using contaminated drops can cause eye irritation or infection. Medication potency may also become less reliable after the expiration date.
Prescription Eye Drops
Do not continue an old prescription eye drop for a new eye problem just because the symptoms seem similar. Antibiotic, steroid, glaucoma, and other prescription drops have specific uses and risks. Some steroid eye drops, for example, can worsen certain infections or raise eye pressure when used incorrectly.
What If You Accidentally Used an Expired Drop?
One accidental use does not automatically mean an infection will occur. Stop using the expired product and watch for symptoms such as increasing pain, marked redness, discharge, light sensitivity, swelling, or worsening vision.
Seek urgent eye care for severe pain, sudden vision loss, significant light sensitivity, eye injury, or rapidly worsening symptoms.
Safer Eye-Drop Habits
- Wash and dry your hands before use.
- Do not let the dropper tip touch the eye, fingers, lashes, or other surfaces.
- Keep the cap tightly closed.
- Store the product exactly as directed.
- Write the opening date on the bottle if the product has a limited in-use period.
- Discard single-use preservative-free vials after use unless the label specifically says otherwise.
Bottom Line
Do not use expired eye drops, and do not assume every opened bottle is safe for 28 days. The correct discard date depends on the exact product. If you are unsure, ask a pharmacist or eye-care professional.
Last reviewed for medical accuracy: September 2026.