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October 31, 2026
Yes. Glaucoma eye drops can cause dry eyes or make dry eye you already have worse. In studies, about half of people using pressure-lowering drops report dry-eye symptoms, and symptoms get worse with each added medicine [1,2]. The preservative benzalkonium chloride (BAK) is a common cause, but the medicine itself and blocked eyelid oil glands also play a part [3,4].
The answer is almost never to stop your drops. Preservative-free drops, fewer bottles, lubricating drops, eyelid care and a laser treatment called selective laser trabeculoplasty (SLT) can ease the burning while your optic nerve stays protected [5,6].
This article is general education, not personal medical advice. Do not stop, skip or change a glaucoma medicine without talking to the doctor who prescribed it.
Key takeaways
In this article
Most dry-eye symptoms from glaucoma drops can wait for a regular visit. A few symptoms cannot. Severe pain in one eye with blurred vision, halos and nausea can mean acute angle-closure glaucoma, which can cause blindness within days. A drop that leaves you wheezing or faint needs emergency help right away [11,12].
Call 911 if, after using an eye drop, you have:
Go to the emergency room or an urgent eye clinic now for:
Call your eye doctor the same day for:
They can, and it is common. In a US study of 630 people using glaucoma drops, 48% had dry-eye symptom scores in the mild to severe range. People using two or three medicines had worse scores than people using one [1]. Dry eye is also common with age, so some people had it before their drops started [16].
In another study of 101 patients, 78% had an unstable tear film. Each added BAK-containing drop roughly doubled the odds of surface damage on a dye test [2]. In 516 patients on long-term drops, worse surface disease went with older age, more daily drops and more severe glaucoma. Four in ten had already switched drops because they could not tolerate them [7].
These studies show a link. They cannot show which part of treatment caused the dryness in one person, so an eye exam should come before any change.
Most people describe burning, stinging, a scratchy or sandy feeling, red eyes, or blurry vision that clears when they blink. Some people get watery eyes, because an irritated surface triggers reflex tears. Strong itching and puffy eyelids can be signs of an allergy to a drop [8,16].
Dry eye and drop allergy can look alike, and both can happen at once. For example, brimonidine (Alphagan P) causes allergic conjunctivitis, redness or itching in about 10% to 20% of users, according to its label [8]. A simple record helps your eye doctor sort out the cause:
Our guide to what causes dry eyes covers other triggers.
Usually several things add up: the preservative, the medicine itself, and how many drops you use each day for how many years. Many people also have blocked eyelid oil glands, called meibomian gland dysfunction, or age-related dry eye that the drops make worse [3,4].
Preservatives keep germs from growing in a bottle that is opened many times. BAK is the most common one and is used in about 70% of eye drop products. It can damage the cells on the surface of the eye, and the effect matters more with lifelong use, as in glaucoma [3,17]. Many brand-name glaucoma drops contain BAK, including Xalatan (latanoprost), Lumigan (bimatoprost) and Rhopressa (netarsudil) [18,19,20].
Removing the preservative does not remove the medicine's own side effects. Redness is the most common side effect of several drops. Labels report it in 31% of people using Lumigan, 30% to 50% using Travatan Z, and 53% using Rhopressa [19,20,21]. Dorzolamide-timolol can burn or sting in up to 30% of people, even in its preservative-free form [22].
More drops mean more exposure to both preservative and medicine. Studies link more medicines and longer use with worse symptoms, more surface damage and changes in the eyelid oil glands [1,4]. In one study, oil-gland changes were seen with both prostaglandin and beta-blocker drops, so this is not limited to one drug class [4].
Preservative-free glaucoma drops contain no preservative. The FDA-approved ones in the table below, including tafluprost, latanoprost, dorzolamide-timolol and timolol, come in sterile single-use vials that you open, use once and throw away. "BAK-free" is not the same thing: those bottles use a different preservative [22,23,24,25].
The table lists common US options by preservative type, based on FDA labels checked in October 2026. Generic versions may use a different preservative from the brand, so check the ingredient list on your own box.
| Brand (medicine) | Drug class | Preservative | Container |
|---|---|---|---|
| Zioptan (tafluprost) | Prostaglandin | None | Single-use vials [23] |
| Iyuzeh (latanoprost) | Prostaglandin | None | Single-use vials [24] |
| Cosopt PF (dorzolamide and timolol) | Combination | None | Single-use vials [22] |
| Timoptic in Ocudose (timolol) | Beta blocker | None | Single-use vials [25] |
| Travatan Z (travoprost) | Prostaglandin | sofZia (no BAK) | Multidose bottle [21] |
| Xelpros (latanoprost) | Prostaglandin | Potassium sorbate (no BAK) | Multidose bottle [26] |
| Alphagan P (brimonidine) | Alpha agonist | Purite (no BAK) | Multidose bottle [8] |
| Xalatan, Lumigan, Rhopressa | Prostaglandin or rho kinase inhibitor | BAK | Multidose bottle [18,19,20] |
For the medicines studied, yes. A 2026 review of 10 trials with 1,880 patients found preservative-free latanoprost lowered pressure about as much as preserved latanoprost at 4 to 12 weeks. It also caused about one-third less eye redness [6]. A broader 2020 review found no clear difference in pressure or redness between BAK drops and other options in short trials. Its authors warned that safety reporting was weak, so the true difference is uncertain [27].
Switching can help some people a lot. In one small study, 30 patients moved from preserved latanoprost to preservative-free tafluprost. Over 12 weeks, eye pressure stayed the same, and the share of eyes with surface damage on a dye test fell from 72% to 12% [28]. That study had no comparison group and changed the medicine as well as the preservative, so results in other people may differ.
Often, yes. Fewer daily drops means less preservative and less medicine on the eye surface. Options include a combination drop with two medicines in one bottle, a once-daily medicine in place of a twice-daily one, laser treatment, or a drug-releasing implant. Each choice must still keep your eye pressure at its target [1,7].
Two drug-releasing implants are FDA-approved as of October 2026: Durysta (bimatoprost) and iDose TR (travoprost). An eye doctor places them inside the front of the eye during a procedure [29,30]. They have their own risks and limits. For example, the Durysta label limits each eye to a single implant and rules it out for people with certain corneal problems, such as Fuchs dystrophy [29].
A combination drop can add a medicine that does not suit your heart, lungs or other health problems, so it is a prescription decision. Our overview of glaucoma eye drop types and side effects compares the drug classes.
For many people with open-angle glaucoma or high eye pressure, yes. Selective laser trabeculoplasty (SLT) is a laser treatment that helps fluid drain out of the eye. In the LiGHT trial, 74% of people treated first with SLT needed no drops to stay at their target pressure after three years [5,11].
LiGHT enrolled 718 untreated people at six UK hospitals. No one in the SLT group needed glaucoma surgery by three years, compared with 11 people in the drops group [5].
SLT is not right for everyone, and it is not a cure. In the six-year LiGHT results, about 70% of SLT-treated eyes were still at target pressure without drops or surgery. Repeat laser treatments were allowed in the trial, and other eyes needed drops or surgery to stay at target [31]. Read more in our guide to SLT laser for glaucoma and our overview of glaucoma surgery and laser options.
Start with preservative-free artificial tears, used at least 5 minutes apart from your glaucoma drops. If that is not enough, your eye doctor may treat eyelid inflammation, prescribe an anti-inflammatory dry-eye drop, or suggest tiny plugs for the tear ducts. Artificial tears ease the surface but never replace your pressure drops [9,10,16].
For more on lid care, prescription drops and in-office treatments, see our guide to dry eye treatment options.
Artificial tears contain no pressure-raising medicine, and no side effects were seen when glaucoma patients used them in a trial [9]. Two other kinds of drops need care. Steroid eye drops can raise pressure in some people, and redness-relief drops carry a warning for people with narrow-angle glaucoma. Ask your eye doctor before using either [36,37].
Long-term steroid use can raise eye pressure and cause glaucoma, so never use leftover steroid drops or someone else's prescription [36]. If a steroid is prescribed for the eye surface, ask when your pressure will be checked. Redness relievers such as naphazoline say to ask a doctor first if you have narrow-angle glaucoma, and overuse can make redness worse [37].
Bring all your eye drops, or photos of the labels. Say which drop stings, when symptoms are worst, and any doses you skip because a drop hurts or costs too much. Then ask:
Netra Restoration Therapy (NRT) is an integrative program used alongside, not instead of, care from your eye doctor. NRT does not lower eye pressure. It does not replace glaucoma drops, laser or surgery, and it is not a treatment for dry eye caused by drops. NRT has not been tested in controlled trials for glaucoma or for drop-related dry eye.
If you use NRT or any other complementary care, keep using your prescribed drops and keep your pressure and visual field checks on schedule. Never put herbal, homemade or other non-sterile liquids into the eye. To learn how results should be judged, read about how NRT effectiveness is evaluated.
Yes, in most cases. Choose a preservative-free artificial tear and wait at least 5 minutes between it and your glaucoma drop so one does not wash out the other. Artificial tears ease surface symptoms but do not lower eye pressure, so they never replace your prescribed drops.
No single drop is best for everyone. Preservative-free tafluprost, latanoprost, timolol and dorzolamide-timolol avoid preservatives entirely, and some bottles use other preservatives in place of BAK. The right choice depends on your target pressure, your other health conditions, cost and whether you can open single-use vials.
It can. Dry eyes, burning, stinging and a feeling that something is in the eye are listed side effects of latanoprost, and the brand Xalatan contains BAK. A preservative-free or BAK-free latanoprost may feel better, but ask your eye doctor before you switch.
For the medicines studied, yes. A 2026 review of 10 trials found preservative-free latanoprost lowered eye pressure about as much as preserved latanoprost, with less eye redness. Your doctor should still recheck your pressure after any switch, because each eye responds a little differently.
No. BAK-free bottles still contain a preservative, just a different one, such as sofZia, potassium sorbate or Purite. Preservative-free drops contain no preservative at all and usually come in single-use vials that you throw away after each dose.
It varies from person to person. In one small study of people switched to a preservative-free drop, surface damage and comfort kept improving over 12 weeks. If you feel no better by your planned review, other causes such as eyelid disease or allergy may need treatment.
No, not on your own. Glaucoma often causes no warning symptoms, so pressure can rise and damage the optic nerve without you noticing. Call your eye doctor instead, because there are almost always other drops, laser or dry-eye treatments to try.
Sources checked October 31, 2026.
This article provides general education and does not replace an individual eye examination, diagnosis or treatment plan. Sudden severe eye pain, rainbow halos, nausea or sudden vision loss needs emergency care right away.
