Are Systane Eye Drops Safe? Side Effects & Recall

Systane eye drops have a well-documented safety profile across multiple clinical trials, and the brand has not been the subject of a major product recall. The confusion around recalls stems from a widely publicized 2023 contamination event involving different artificial tear brands, not Systane. That said, no over-the-counter eye drop is completely without risk, and the details around preservatives, contamination of opened bottles, and long-term use are worth understanding.

What Systane Drops Contain and How They Work

Systane is a family of lubricating eye drops made by Alcon, and the lineup includes several formulations: Systane Ultra, Systane Complete, Systane Balance, and preservative-free versions of some of these. The active ingredients across most formulations are polyethylene glycol (PEG) and propylene glycol (PG), which act as demulcents, a category of substance that coats and protects irritated tissue. What sets Systane apart from many generic artificial tears is its use of hydroxypropyl guar (HP-guar), a gelling agent that reacts with borate ions on the eye’s surface to form a mesh-like layer. This gel matrix holds the lubricating ingredients against the cornea longer than a simple saline solution would, extending the period of relief.

A review of preclinical and clinical studies on HP-guar-based formulations found that the cross-linked gel matrix prolongs the retention of demulcents, providing longer-lasting lubrication and surface protection compared to drops without the gelling technology.¹ A decade-long review of Systane Ultra specifically concluded that its combination of PEG, PG, and HP-guar provides effective protection and helps heal corneal damage caused by dry eye disease.² None of these active ingredients are known to cause significant harm to the eye, which is a meaningful distinction from some of the inactive ingredients discussed below.

Common Side Effects

The most frequently reported side effect of Systane and similar lubricating eye drops is temporary blurred vision right after instilling the drop. In a clinical trial of Systane Balance used by patients with meibomian gland dysfunction (a common cause of dry eye), blurred vision was the most common medication-related adverse event, occurring in about 6% of participants.³ This blurring is usually brief, lasting seconds to a minute or two, and happens because the gel-forming ingredients need a moment to spread and settle across the eye’s surface. It is not a sign of damage.

Beyond blurred vision, some users report mild stinging or burning on application, particularly if their eyes are already inflamed. Occasional tearing or a feeling of something in the eye can also happen. These reactions are generally self-limiting and tend to diminish with continued use as the ocular surface heals. Severe reactions like significant eye pain, persistent redness, or vision changes that last more than a few minutes are rare and warrant a visit to an eye care provider, as they could indicate an allergy to one of the drop’s components or an underlying condition that needs treatment beyond over-the-counter drops.

The Preservative Question

The safety conversation around any eye drop gets more complicated when you look at preservatives, and this is where Systane’s formulation choices matter. Most multi-dose eye drop bottles contain a preservative to prevent bacterial growth after the bottle is opened. The preservative used most widely in ophthalmic products is benzalkonium chloride, commonly called BAK, which appears in roughly 70% of ophthalmic formulations.⁴ BAK is effective at keeping bottles sterile, but it has a well-documented downside: it is toxic to the cells on the surface of the eye.

Research shows that BAK damages conjunctival and corneal epithelial cells, causes loss of goblet cells (which produce the mucus layer of your tear film), delays corneal wound healing, and triggers cell death through apoptosis.⁴ Laboratory studies have also found that BAK exposure induces inflammation, oxidative stress, and nerve damage in corneal tissue, effects that can paradoxically worsen the dry eye disease the drops are supposed to treat.⁵ The damage is dose-dependent: higher concentrations cause rapid harm, while even very low concentrations can gradually erode the corneal barrier over days.⁶

Here is where it gets relevant for Systane users specifically. Standard multi-dose Systane Ultra and Systane Balance bottles use a proprietary preservative system called Polyquad (polyquaternium-1) rather than BAK. This distinction matters. In head-to-head laboratory comparisons, Polyquad-preserved formulations showed no significant difference in cell toxicity compared to plain saline, while BAK-preserved formulations caused dramatically more cell death and apoptosis.⁷ A clinical study using impression cytology (sampling cells from the eye’s surface) similarly found that Polyquad-preserved drops were safer and better tolerated than BAK-preserved drops, with better ocular surface comfort.⁸

So if you are using a standard multi-dose Systane bottle, the preservative system is considerably gentler than what you would find in many other eye drops on the shelf. That said, for people who use artificial tears very frequently (more than four to six times a day), or who are also using preserved prescription eye drops like glaucoma medications, the cumulative preservative exposure can still add up. In those situations, preservative-free single-use vials are the better choice. Alcon sells preservative-free versions of Systane Ultra and Systane Complete, and these eliminate the preservative concern entirely.

Using Systane with Contact Lenses

A common question is whether it is safe to put Systane drops in while wearing contacts. The short answer is that Systane has been tested in contact lens wearers and found to be safe, though the specific formulation matters. A two-week clinical evaluation of Systane Ultra in contact lens wearers found no adverse events, no change in visual acuity, and no increase in corneal staining.⁹ Systane Complete has also been studied for direct application onto soft contact lenses, with researchers concluding that it safely improved comfort and dryness symptoms when used before, during, and after lens wear.¹⁰

A broader review of artificial tears and rewetting drops used with contact lenses concluded that these products are generally safe and effective, with minimal impact on the ocular surface, especially if the drops are preservative-free.¹¹ If you wear contacts daily and reach for drops multiple times a day, preservative-free vials are the safer long-term bet, since preservatives can accumulate in the lens material over time.

After LASIK and Other Eye Surgeries

Dry eye is extremely common after LASIK and other refractive surgeries, and artificial tears are a standard part of postoperative care. Systane has been specifically evaluated in this context. A randomized clinical trial of patients recovering from LASIK found that Systane used twice daily was safe and well tolerated, with no adverse events reported. The Systane-treated eyes also had a measurably longer tear breakup time two weeks after surgery compared to placebo, suggesting the drops helped stabilize the recovering tear film.¹² Many ophthalmologists recommend preservative-free formulations during the early healing window, since the cornea is more vulnerable to irritants immediately after surgery.

Contamination Risks with Opened Bottles

One safety concern that applies to all multi-dose eye drops, not just Systane, is bacterial contamination after a bottle has been opened and used for a while. A study analyzing 271 containers of multi-use tear drops, gels, and ointments found bacterial contamination in about 12% of them. Among eye drops specifically, the contamination rate was about 8%, while ointments were contaminated at a much higher rate of 32%. The bacteria detected included clinically significant species like Pseudomonas aeruginosa, MRSA, and Serratia marcescens.¹³

A separate study looking at multi-dose eye drops in a surgical setting found lower contamination rates (about 2% of dropper tips tested positive), with the organisms identified being normal skin bacteria rather than dangerous pathogens.¹⁴ The practical takeaway is straightforward: don’t touch the dropper tip to your eye, eyelid, or fingers; replace multi-dose bottles after the manufacturer’s recommended period (usually 28 to 90 days after opening, depending on the product); and consider single-use vials if you are immunocompromised or recovering from eye surgery.

The Recall Confusion

If you searched for “Systane recall,” you were likely prompted by news coverage of a serious contamination event in early 2023 that involved artificial tear products but did not involve Systane. The products recalled were EzriCare and Delsam Pharma’s Artificial Tears, which were manufactured at a facility in India and found to be contaminated with a drug-resistant strain of Pseudomonas aeruginosa. That outbreak led to serious eye infections, vision loss, and several deaths. The FDA issued warnings and the products were pulled from the market.

Systane, manufactured by Alcon, was not part of that recall and was not linked to the contamination event. The two product lines have entirely different manufacturers, supply chains, and quality control processes. However, the incident understandably rattled consumers’ confidence in all over-the-counter eye drops, and searches for safety information about trusted brands like Systane spiked in the aftermath. If your Systane bottle has an Alcon label and was purchased from a mainstream retailer or pharmacy, you are not affected by that recall.

How OTC Eye Drops Are Regulated

The 2023 contamination event also exposed gaps in how over-the-counter eye drops are overseen in the United States. A commentary in JAMA Ophthalmology noted that the OTC eye care market reached 149 million units in annual sales and nearly $1.6 billion in revenue in 2022 alone, yet the market is largely self-regulated despite the potential for serious injury.¹⁵ Unlike prescription drugs, which undergo rigorous pre-market review, many OTC eye drops are marketed under an FDA monograph system that sets general standards for active ingredients but places much of the quality control burden on the manufacturer.

For a major manufacturer like Alcon, which operates FDA-inspected facilities and has decades of ophthalmic manufacturing history, this system generally works. The risk is higher with smaller, less-established companies or products imported from facilities with less consistent oversight. If you’re choosing between brands on a pharmacy shelf, sticking with established manufacturers is one practical way to reduce risk, though it’s not a guarantee.

Long-Term Use

Many people with chronic dry eye use artificial tears daily for years, so the question of long-term safety is legitimate. A randomized, double-phase study evaluating a multi-component artificial tear over an extended period found that treated eyes showed significant improvements in tear film stability, reduced tear evaporation, and improved lipid layer quality compared to baseline, with symptom scores on a standard dry eye questionnaire also improving significantly. There were no reported long-term harms from continued use. The evidence suggests that for preservative-free formulations, or those using gentle preservative systems like Polyquad, extended daily use does not damage the ocular surface and may in fact allow it to heal over time.

The one caveat for long-term users is that artificial tears treat symptoms, not the underlying cause of dry eye. If you find yourself reaching for drops many times a day and still struggling, the underlying problem may be meibomian gland dysfunction, an inflammatory condition, a medication side effect, or an environmental factor that warrants a proper evaluation rather than more drops.

How Systane Stacks Up Against Other Brands

With dozens of artificial tear brands on the market, you might wonder whether Systane performs any differently from cheaper alternatives. A comparative study using non-invasive imaging to objectively measure tear film stability across 15 commercially available eye drops found that Systane Ultra outperformed all other drops tested for non-invasive tear breakup time, a key measure of how long the tear film stays intact between blinks.¹⁶ Store-brand drops and some well-known brands like Visine underperformed relative to most other drops in the same study.

That said, “best at stabilizing tear film” does not automatically mean “best for every person.” Dry eye has different subtypes. A systematic review of artificial tear formulations noted that people whose dry eye is primarily evaporative (often caused by meibomian gland dysfunction, where the oily layer of the tear film is deficient) tend to benefit most from drops containing liposomes, particularly at higher concentrations.¹⁷ Systane Balance and Systane Complete contain lipid components designed for this purpose, while Systane Ultra is geared more toward aqueous deficiency. Choosing the right formulation within the Systane family, or among competitors, depends on which layer of your tear film is failing, something an eye care professional can help you figure out.

When Artificial Tears Are Not Enough

Systane and other over-the-counter artificial tears occupy the first rung on the dry eye treatment ladder. They work well for mild to moderate symptoms and are genuinely safe for the vast majority of users. But dry eye disease is a spectrum, and moderate-to-severe cases often need more than lubrication alone. Prescription anti-inflammatory drops like cyclosporine or lifitegrast target the immune-driven inflammation that perpetuates the cycle of dryness and surface damage. Punctal plugs, which block the tear drainage ducts to keep tears on the eye longer, are another option. In-office procedures like intense pulsed light therapy or thermal expression of clogged meibomian glands address structural causes that no drop can fix.

If you have been using Systane or any artificial tear regularly for weeks and your symptoms are not improving, or if you notice increasing redness, light sensitivity, or fluctuating vision, those are signs to move beyond self-treatment. Over-the-counter drops are a reasonable first step, and they remain a useful supplement even when stronger treatments are added, but they have a ceiling, and recognizing when you have hit it matters more than choosing between brands.