Eyemycin Side Effects: What to Expect and When to Call Your Doctor

Erythromycin ophthalmic ointment (Eyemycin) is generally a well-tolerated medication. Because it's applied directly to the eye rather than taken by mouth or injection, systemic side effects are rare. However, like any medication, it can cause local reactions — and knowing what to expect can help you use it safely and comfortably.

Common Side Effects of Eyemycin

Most people who use erythromycin ophthalmic ointment experience only mild, temporary side effects. These are normal and typically improve within a few days of starting treatment:

Blurred vision: This is the most common effect of any eye ointment. The petrolatum-based ointment temporarily coats the eye and blurs vision for a few minutes after application. This is expected and resolves quickly on its own.

Minor eye irritation or stinging: Mild stinging or discomfort immediately after application is common and usually brief.

Redness: Some temporary redness of the eye or eyelid may occur after applying the ointment.

Crusty or sticky eyelashes: The ointment can accumulate on eyelashes, especially overnight. Gently wipe excess ointment away with a clean tissue.

Serious Side Effects: Call Your Doctor If You Notice These

Serious side effects from erythromycin ophthalmic ointment are rare. Stop using the ointment and contact your doctor or seek medical attention right away if you experience:

Severe burning, stinging, or intense irritation that doesn't go away or gets significantly worse after application

Signs of a serious allergic reaction: Hives, difficulty breathing, swelling of face, lips, tongue, or throat — seek emergency care immediately

Worsening eye infection: If your symptoms (discharge, redness, pain) are getting worse after 2–3 days of treatment rather than improving, the bacteria may be resistant or you may have a different type of infection (viral, fungal)

Vision changes or eye pain: Significant vision loss, severe pain, or sensitivity to light (photophobia) warrant immediate ophthalmologic evaluation

Signs of a secondary infection: Using any antibiotic can sometimes allow non-susceptible organisms (including fungi) to overgrow. If you develop new or unusual symptoms, contact your prescriber.

What About Blurred Vision From the Ointment?

The temporary blurred vision from erythromycin eye ointment is one of the most common patient concerns, and it's entirely normal. The ointment base (white petrolatum and mineral oil) creates a thin film over the eye that causes blurring for a few minutes after each application.

To minimize this inconvenience:

Apply the ointment just before bedtime if possible — blurred vision won't affect nighttime activities

Do not drive or operate machinery immediately after applying the ointment

Wait a few minutes and blink a few times — vision usually clears within 1–3 minutes

Drug Interactions With Eyemycin

Because erythromycin ophthalmic ointment is applied to the eye and very little is absorbed into the bloodstream, clinically significant drug interactions with other medications are not expected. There are no known interactions between erythromycin ophthalmic ointment and foods, drinks, or other eye drops when used as directed.

However, always tell your doctor about all medications you are taking, including other eye drops or ointments, to avoid accidental contamination or scheduling conflicts.

Who Should Not Use Eyemycin?

Do not use erythromycin ophthalmic ointment if:

You have a known allergy or hypersensitivity to erythromycin or any macrolide antibiotic

You are allergic to any other ingredient in the ointment (mineral oil, white petrolatum)

For more detail on drug interactions, see our guide on Eyemycin drug interactions. If you need help finding erythromycin at a pharmacy near you, visit medfinder.com.