What Antibiotic Eye Drops Are Safe During Pregnancy?

Most topical antibiotic eye drops appear to be safe during pregnancy based on the evidence currently available, though the formal research is thinner than you might expect. A large propensity-score study found that first-trimester use of topical ophthalmic antibiotics for common conditions like styes, blepharitis, and bacterial conjunctivitis was not linked to increased rates of birth defects, preterm birth, or low birth weight. The reassurance comes with a caveat worth understanding: even eye drops can be absorbed into your bloodstream in small amounts, which is why the choice of antibiotic and how you use the drops both matter.

Why Eye Drops Aren’t Automatically Risk-Free

It sounds counterintuitive that a drop placed on the surface of your eye could reach a developing fetus, but the anatomy of your tear drainage system makes it possible. When you put a drop in your eye, a portion of it drains through the nasolacrimal duct into the nasal cavity, where it can be absorbed through the mucous membranes and enter the general circulation. A 2023 narrative review of ophthalmic treatments during pregnancy confirmed that even with topical administration, there is a meaningful amount of systemic absorption that clinicians need to consider.¹

That said, the amount reaching your bloodstream from an eye drop is far smaller than what you would get from swallowing a pill. A single drop of antibiotic solution delivers micrograms of medication to your eye, and only a fraction of that enters systemic circulation. This is why ophthalmologists and obstetricians generally treat topical eye antibiotics as low-risk during pregnancy, even when the same antibiotic taken orally would prompt more caution. The concern is not that eye drops are dangerous but that almost no drug has been formally tested in pregnant women, so doctors work from indirect evidence and professional judgment.

Which Antibiotic Eye Drops Have the Best Evidence

The most direct evidence comes from a propensity-score analysis published in the journal Eye, which compared pregnancy outcomes in women who used topical ophthalmic antibiotics during their first trimester against women who used no antibiotics for similar eye conditions. The study found no association between antibiotic eye drop use and increased rates of congenital anomalies, preterm birth, or low birth weight.² That study specifically examined fluoroquinolone drops alongside other classes, so the reassurance isn’t limited to a single antibiotic type.

In clinical practice, the following categories come up most often:

• Erythromycin ointment: Widely considered a first-line choice. Erythromycin belongs to the macrolide class, which has a long track record of use during pregnancy. Ophthalmologists commonly reach for erythromycin ophthalmic ointment when treating bacterial conjunctivitis or styes in pregnant patients, in part because macrolides have not been associated with birth defects in decades of use.
• Polymyxin B/trimethoprim drops: Another option frequently used during pregnancy. These drops work through a different mechanism and are generally considered low-risk given the minimal systemic absorption from topical use.
• Fluoroquinolone drops: These are the workhorses for many bacterial eye infections outside of pregnancy and have been traditionally avoided during pregnancy based on animal studies. However, newer human data has shifted the picture considerably.

The review from 2023 noted a key frustration: despite ongoing advances in ophthalmic drugs, no updated comprehensive safety data exist for most of these medications in pregnant or breastfeeding women.¹ Doctors are largely relying on older classification systems, small observational studies, and extrapolation from oral-dose safety profiles.

The Fluoroquinolone Question

Fluoroquinolone eye drops like ofloxacin, ciprofloxacin, and moxifloxacin deserve their own discussion because the gap between perception and evidence is unusually wide. Animal studies showed joint and cartilage damage in young animals exposed to fluoroquinolones, which led to blanket warnings against use during pregnancy. For years, many pregnant women were told to avoid them entirely.

The human evidence tells a different story. A large observational cohort study compared pregnancy outcomes in 949 women exposed to fluoroquinolones during the first trimester against nearly 3,800 unexposed controls. The rate of major birth defects was the same in both groups, at about 2.4%, and the risk of spontaneous miscarriage was not elevated either. The researchers concluded that these “reassuring findings support the recommendation to allow fluoroquinolone use in early pregnancy in selected cases.”³ That study included women who took fluoroquinolones orally, meaning their systemic exposure was far higher than what you would get from a few days of eye drops.

The Eye study reinforced this with data specific to topical ophthalmic use. Among women who used fluoroquinolone eye drops in the first trimester, rates of congenital anomalies, preterm birth, and low birth weight were essentially identical to those in a comparison group using no antibiotics at all.⁴ The congenital anomaly rate was about 6.8% in both the fluoroquinolone group and the non-antibiotic group, and none of the other outcomes showed statistically meaningful differences.

This doesn’t mean fluoroquinolone drops are automatically first-line during pregnancy. Most practitioners still prefer erythromycin or polymyxin B combinations when those will get the job done, reserving fluoroquinolones for situations where the infection demands broader or more potent coverage. But if your doctor prescribes a fluoroquinolone eye drop during pregnancy, the available human data is genuinely reassuring.

A Simple Technique That Reduces Absorption

Regardless of which drops you use, there is a straightforward physical technique that cuts down on how much medication enters your bloodstream. It’s called nasolacrimal occlusion, or punctal occlusion, and it involves pressing gently on the inner corner of your eye after instilling a drop. You hold light pressure with a fingertip on the bridge of your nose, right where the tear duct opening sits, for about one to two minutes after putting in the drop. This blocks the medication from draining into your nasal cavity, keeping more of it on the eye surface where it belongs.

Research confirms the technique works. A review found that nasolacrimal occlusion and simple eyelid closure both improve how much drug penetrates into the eye while reducing systemic absorption.⁵ You get a better therapeutic effect in the eye and less drug elsewhere in your body.

The catch is that most people perform the technique poorly or forget to do it altogether. One study noted that while nasolacrimal occlusion is effective, patients find it difficult in practice.⁶ If you are pregnant and want to minimize even the small systemic exposure from eye drops, making a conscious effort to press the inner corner of your eye for a full minute after each drop is one of the most practical steps you can take. Closing your eyes gently rather than blinking also helps, since blinking pumps the drop through the drainage system faster.

When You Shouldn’t Wait to Treat an Eye Infection

Some women try to avoid all medications during pregnancy, but delaying treatment for a bacterial eye infection can create its own problems. Bacterial conjunctivitis, if left untreated, can spread to the other eye, become more difficult to clear, or occasionally progress to a more serious infection that requires stronger drugs. A stye or chalazion that worsens can become a preseptal cellulitis, which then demands oral antibiotics rather than topical ones, an outcome nobody wants during pregnancy.

The calculus is straightforward: a few days of low-dose topical antibiotic almost always carries less risk to you and your pregnancy than an escalating infection that requires systemic treatment. Your doctor can help weigh the severity of your particular infection against the specific antibiotic options, but in most cases of bacterial conjunctivitis, blepharitis, or hordeola, prompt treatment with a topical agent is the safer path.

Severe infections like bacterial keratitis (a corneal ulcer) are a different situation entirely. These are sight-threatening and demand aggressive treatment regardless of pregnancy status. In those cases, ophthalmologists will choose the most effective antibiotic for the organism involved and discuss any risks with you. Fortunately, these serious infections are uncommon, and the treatment course is still topical in most cases.

Viral and Allergic Eye Conditions During Pregnancy

Not every red, irritated eye during pregnancy calls for antibiotic drops. Viral conjunctivitis, which accounts for the majority of “pink eye” cases, does not respond to antibiotics at all and typically resolves on its own in one to three weeks. Allergic conjunctivitis, driven by pollen, pet dander, or other irritants, is also common during pregnancy and requires antihistamine or mast cell stabilizer drops rather than antibiotics. Pregnancy-related hormonal changes can make dry eye worse, leading to redness and discomfort that mimics infection but is treated with lubricating drops instead.

Getting the right diagnosis matters more during pregnancy than at any other time, because it determines whether you need an antibiotic at all. If your eye is watery and itchy without much discharge, you likely have a viral or allergic process. If you have thick yellow-green discharge, especially upon waking, a bacterial cause is more probable. Your doctor or an eye care professional can usually distinguish these with a brief exam, sparing you unnecessary antibiotic exposure if the cause turns out to be non-bacterial.

Eye Drops While Breastfeeding

The concern about systemic absorption does not disappear after delivery if you are breastfeeding, though the stakes change. Any drug that enters your bloodstream can theoretically appear in breast milk, but the amount reaching your infant from a topical eye drop is vanishingly small. The same 2023 review that covered pregnancy also addressed breastfeeding and aimed to provide practical guidance for minimizing harm while treating maternal eye conditions.¹

In practice, the same antibiotics considered safe during pregnancy are also used during breastfeeding. Erythromycin ointment remains a go-to option. The nasolacrimal occlusion technique is equally useful here if you want to limit how much drug enters your system and subsequently your milk. Some practitioners recommend timing eye drop use just after a feeding session so that any drug levels in your blood have peaked and begun declining before the next feeding, though with topical ocular antibiotics the amount involved is so tiny that this precaution is more reassuring than strictly necessary.

Neonatal Eye Prophylaxis and How It Relates

If you have read about antibiotic eye ointment being applied to newborns immediately after birth, you may wonder how that connects to the question of antibiotic eye drops during pregnancy. The newborn application is a separate practice altogether, aimed at preventing infections the baby could acquire during passage through the birth canal.

Erythromycin ophthalmic ointment has been the standard prophylactic agent in many countries. An early trial found that none of the 24 infants born to Chlamydia-positive mothers who received erythromycin ointment developed chlamydial conjunctivitis, compared to a third of infants who received older silver nitrate drops.⁷ That result helped establish erythromycin as the preferred prophylaxis for decades.

More recent evidence has complicated the picture. A 2021 systematic review concluded that neonatal prophylaxis with erythromycin or tetracycline ointments did not actually reduce the incidence of chlamydial conjunctivitis or respiratory infection in infants born to infected mothers, compared to silver nitrate alone.⁸ And a randomized trial comparing silver nitrate, erythromycin, and no prophylaxis at all in low-risk infants found that while silver nitrate modestly lowered conjunctivitis rates, the benefit was small and directed against organisms of low virulence, leading the authors to suggest that parental choice, including no prophylaxis, was reasonable for women who had received adequate prenatal screening.⁹

Several countries, including Canada and some European nations, have already moved away from mandatory neonatal eye prophylaxis for low-risk births. In the United States, most states still require it by law, though the rationale is increasingly debated. This is worth knowing because some parents confuse the newborn ointment discussion with the safety of eye drops during pregnancy itself. They are distinct issues: one is about treating a maternal infection, and the other is about preventing a neonatal one.

What Your Eye Doctor Needs to Know

If you develop an eye infection while pregnant, the single most important thing you can do is tell both your eye care provider and your obstetrician. Ophthalmologists and optometrists may not know you are pregnant unless you mention it, and they can adjust their prescribing accordingly. Conversely, your OB may not realize you are using eye drops unless you bring it up, and they can weigh any topical treatment in the context of your full medication list.

Some eye conditions during pregnancy are not infections at all but signs of systemic changes that deserve attention. Blurred vision, sudden floaters, or visual field loss in the third trimester can occasionally signal preeclampsia or other serious conditions. These are not treated with eye drops and require urgent obstetric evaluation. Mentioning any vision changes to your prenatal care provider ensures nothing is overlooked.

For garden-variety bacterial conjunctivitis, styes, and blepharitis, the evidence supports using topical antibiotics with confidence. Choose erythromycin ointment or polymyxin-based drops when possible, accept a fluoroquinolone if your doctor deems it the best choice for your infection, and practice nasolacrimal occlusion after every drop. The research consistently points in the same direction: treating the infection is safer than ignoring it, and the topical antibiotics available to you carry no measurable increase in pregnancy risk based on the studies conducted so far.