Applying erythromycin ophthalmic ointment is straightforward once you know the technique: tilt your head back, pull down your lower eyelid to create a small pocket, and squeeze a thin ribbon of ointment (about 1 cm, or roughly one-third of an inch) into that pocket. The whole process takes under a minute, but a few details make the difference between an effective dose and a wasted, contaminated one.
Preparing Your Eye and Hands
Start by washing your hands thoroughly with soap and water. This is the single most important step for preventing new bacteria from entering an already infected eye.
If your eyelids are crusty or sticky, especially first thing in the morning, clean them before applying the ointment. Dip a clean, folded tissue in cooled boiled water and wipe gently from the inner corner of your eye (near the nose) outward toward your ear. If the lids are still sticky after one pass, use a fresh tissue and repeat. Removing that crust lets the medication make full contact with the surface of your eye rather than sitting on top of dried discharge.
Step-by-Step Application
Tilt your head back. You can do this standing in front of a mirror or lying down, whichever feels steadier. Press one finger gently on the skin just below your lower eyelid and pull it down, away from your eyeball. This creates a small pocket between the lid and the eye, called the conjunctival sac.
Hold the tube close to your eye, but not touching it. Squeeze a thin strip of ointment, about 1 cm (one-third of an inch), directly into that pocket. Think of it as a small ribbon laid along the inside of the lower lid. Unless your doctor has told you otherwise, that short strip is a full dose.
Release the lower eyelid and gently close both eyes. Keep them closed for one to two minutes. This gives the ointment time to spread across the surface of the eye and make contact with the infection. Resist the urge to blink rapidly or rub your eyes during this time.
Keeping the Tube Clean
The tip of the tube should never touch your eye, your eyelid, your fingers, or any other surface. Even brief contact can transfer bacteria onto the applicator tip, and those bacteria get pushed back into the tube the next time you recap it. From that point on, every dose you squeeze out carries contamination with it.
After each use, wipe the tip of the tube with a clean, dry tissue. Then close the cap tightly right away. Store the tube at room temperature, between 68°F and 77°F (20°C to 25°C). Keep it away from excessive heat and do not freeze it. If the cap design requires twisting rather than pulling, that’s intentional: it reduces the chance you’ll touch and contaminate the tip while opening it.
How Often to Apply
For superficial eye infections like bacterial conjunctivitis, the standard dosing is up to six times per day, depending on how severe the infection is. Your prescriber will tell you the exact frequency and how many days to continue. Even if the eye looks and feels better after a couple of days, finish the full course. Stopping early gives surviving bacteria a chance to multiply again.
If you miss a dose, apply it as soon as you remember. If it’s nearly time for the next one, skip the missed dose and continue on schedule. Don’t double up to compensate.
What to Expect After Application
Ointments are thicker than eye drops, so your vision will be blurry for several minutes after each dose. This is completely normal. The greasy base of the ointment needs time to spread and absorb. Avoid driving or doing anything that requires sharp vision until it clears. Many people find it easiest to apply the ointment right before bed, since the blur won’t matter while sleeping and the medication sits on the eye surface longer overnight.
You may also notice a slight film or stickiness on your eyelashes. That’s just excess ointment working its way out and can be wiped away with a clean tissue.
Applying to an Infant’s Eyes
Erythromycin ointment is routinely given to newborns shortly after birth to prevent eye infections that can be passed during delivery. The CDC recommends applying it to both eyes as soon as possible after birth, ideally within 24 hours. The technique is similar: a 1 cm ribbon of ointment is placed into the lower eyelid pocket of each eye. In a hospital or birthing center, a nurse or midwife typically handles this. A fresh, unopened tube is used for each baby to eliminate any risk of cross-contamination.
Signs of an Allergic Reaction
Allergic reactions to erythromycin are rare, but they can be serious. Seek emergency help if you experience sudden swelling of the lips, mouth, throat, or tongue, difficulty breathing or swallowing, rapid wheezing, or if your skin or lips turn blue or pale. Sudden confusion, dizziness, or fainting after application also warrants an immediate call to emergency services. Mild irritation or redness at the application site is more common and usually not dangerous, but persistent or worsening irritation is worth reporting to your prescriber.