The best allergy eye drops for most people are dual-action formulas containing olopatadine or ketotifen. These ingredients both block histamine (the chemical causing your itching and redness) and prevent your immune cells from releasing more of it. All three concentrations of Pataday (olopatadine) and Zaditor (ketotifen) are available over the counter, and they’re the go-to recommendation for everyday seasonal or pet-related eye allergies.
That said, the “best” drop depends on how severe your symptoms are, how often they flare up, and whether you wear contact lenses. Here’s what to know about each type.
Dual-Action Drops: The First Choice
Dual-action drops work two ways at once. They block histamine receptors so the itching and redness ease quickly, and they stabilize mast cells (the immune cells in your eye tissue that trigger allergic reactions) so fewer inflammatory chemicals get released in the first place. This combination makes them more effective than drops that only do one of those jobs.
The two most widely available OTC dual-action ingredients are olopatadine and ketotifen. In a head-to-head trial of 120 patients, olopatadine reduced itching, tearing, and redness significantly more than ketotifen by day four. At the 30-minute mark, 42 to 62 percent of olopatadine users showed improvement compared to 20 to 27 percent on ketotifen. By day seven, olopatadine cut symptoms by 80 to 87 percent versus 60 to 75 percent for ketotifen. Olopatadine also caused fewer side effects and produced better quality-of-life scores.
That doesn’t mean ketotifen is a bad choice. It’s effective, widely available as the store-brand version of Zaditor, and usually a few dollars cheaper. But if you want the fastest, strongest OTC relief, olopatadine (sold as Pataday) has the edge.
Choosing a Pataday Concentration
Pataday comes in three strengths, all available without a prescription:
- Pataday 0.1% (Once Daily Relief Extra Strength is the older twice-daily formula): One drop in each eye twice a day, at least six to eight hours apart. Approved for ages 2 and up.
- Pataday 0.2%: One drop in each eye once a day. Approved for ages 2 and up.
- Pataday 0.7%: One drop in each eye once a day. This is the highest concentration and was previously prescription-only. Approved for ages 2 and up.
If you want the simplest routine, the 0.2% or 0.7% once-daily options are more convenient. The 0.7% version delivers the most medication per drop, which can help during peak pollen season when symptoms are relentless.
Mild Symptoms: Start With Artificial Tears
If your eyes feel mildly gritty or watery during allergy season but aren’t intensely itchy, plain lubricating drops may be enough. Artificial tears physically flush pollen and dander off the eye’s surface and soothe irritation without any active drug. Clinical guidelines recommend them as the first step for mild allergic conjunctivitis. You can use them as often as needed throughout the day, and they pair well with medicated drops if you need to add something stronger later.
Long-Term Use: Mast Cell Stabilizers
If your allergies last for months (perennial allergies triggered by dust mites, mold, or pets), a pure mast cell stabilizer like cromolyn sodium can work well for ongoing prevention. These drops stop your mast cells from degranulating, which means they block the entire cascade of inflammatory chemicals before it starts.
The tradeoff is patience. Mast cell stabilizers need several weeks of continuous use before they reach full effectiveness. They won’t rescue you from a sudden flare the way an antihistamine drop will. Think of them as a maintenance strategy: you start using them before allergy season ramps up and keep going throughout. For acute itching on top of that baseline, you can add an antihistamine or dual-action drop.
Drops to Use Carefully: Decongestants
Eye drops that “get the red out” (brands like Visine Original or Clear Eyes) contain vasoconstrictors that shrink blood vessels on the eye’s surface. They make your eyes look whiter within minutes, which feels satisfying. The problem is rebound redness. The American Academy of Ophthalmology recommends not using decongestant eye drops for more than 72 hours. After that, your blood vessels can dilate even more than before, leaving your eyes redder than they were when you started.
Some combination drops pair a decongestant with an antihistamine, and these can be useful for short bursts of severe redness and itching. But for day-to-day allergy management, stick with dual-action antihistamine/mast cell stabilizer drops instead. They treat the underlying allergic response without the rebound risk.
When OTC Drops Aren’t Enough
For severe or recurring allergic conjunctivitis that doesn’t respond to OTC dual-action drops, doctors may prescribe stronger options. Topical anti-inflammatory drops (corticosteroids or NSAIDs) can knock down stubborn inflammation, but both come with risks that require professional monitoring. Steroid drops can raise eye pressure and should only be used in short courses under specialist supervision. Prescription NSAID drops carry a risk of corneal surface damage, especially in people with dry eye, diabetes, or a history of eye surgery.
Oral antihistamines like loratadine or cetirizine can also help when eye symptoms are part of a bigger allergy picture involving sneezing and congestion. They work systemically rather than locally, which means they may dry out your eyes somewhat, but they reduce the overall allergic load your body is dealing with.
Tips for Contact Lens Wearers
Most medicated allergy drops should be applied before you insert your lenses. The standard recommendation is to put drops in 15 minutes before putting your contacts in. This gives the medication time to absorb and prevents preservatives from getting trapped between your lens and your cornea.
If your lenses themselves seem to worsen your symptoms, try switching to a hydrogen peroxide-based cleaning solution. These are less likely to contain preservatives that can irritate already-sensitive eyes. Daily disposable lenses are another good option during allergy season since a fresh lens every morning means less allergen buildup.
Preservatives and Sensitive Eyes
Many eye drops contain benzalkonium chloride (BAK) as a preservative. For occasional use, this is fine for most people. But if you’re using drops multiple times a day, or if your eyes are already irritated, BAK can add to the discomfort. Preservative-free formulations come in single-use vials or special multi-dose bottles designed to stay sterile without preservatives. Brands like Systane, Refresh, and Blink all offer preservative-free lubricating drops. For medicated allergy drops specifically, preservative-free options are less common, but the once-daily Pataday formulations minimize preservative exposure simply because you’re only using one drop per day.
Using Allergy Drops for Children
Both Pataday (olopatadine) and Zaditor (ketotifen) are approved for children ages 2 and older. The dosing is the same as for adults: one drop per eye, either once or twice daily depending on the formulation. For children under 2, there’s no established OTC recommendation, and a pediatrician should guide treatment. Artificial tears are generally safe at any age and can be a good starting point for toddlers with mild seasonal eye irritation.