Patanol eye drops are an antihistamine ophthalmic solution containing olopatadine 0.1%, originally sold as a prescription drug by Alcon and rebranded as OTC Pataday Twice Daily Relief in February 2020. The medication targets allergic conjunctivitis caused by pollen, dust, and animal dander.

Olopatadine works through two pathways: it blocks H1-receptors and stabilizes mast cells to prevent histamine release. Clinical studies show relief within 30 minutes and protection against allergen challenge for up to 8 hours per dose. Patients rate it 8.3 out of 10 on Drugs.com, with 79% noting positive experiences.

The original prescription Patanol cost up to $300 per 5 mL bottle. Generic olopatadine 0.1% and OTC Pataday now offer the same proven formulation at far lower cost. This review covers how Patanol works, its side effects, correct usage, and whether the OTC version delivers the same results as the prescription original.

What Are Patanol Eye Drops?

Patanol eye drops are a prescription antihistamine ophthalmic solution containing olopatadine hydrochloride 0.1%, used to treat the signs and symptoms of allergic conjunctivitis. The medication was originally manufactured by Alcon, a Novartis company, and supplied as a sterile 5 mL solution in a DROP-TAINER dispenser.

The Patanol brand was discontinued in the United States in February 2020. Alcon rebranded the formulation as Pataday Twice Daily Relief, which is now available over the counter without a prescription.

Patanol belongs to the drug class of ophthalmic antihistamines and decongestants. The product carries a pH of approximately 7 and an osmolality of approximately 300 mOsm/kg, designed for safe topical application to the eye.

What Is Olopatadine and How Does It Work?

Olopatadine is a relatively selective H1-receptor antagonist and inhibitor of histamine release from mast cells, classified as both an antihistamine and mast cell stabilizer. The compound works through a dual mechanism, blocking histamine at its receptor while also preventing mast cells from releasing it.

Olopatadine hydrochloride is a white, crystalline, water-soluble powder with a molecular weight of 373.88. Each milliliter of Patanol contains 1.11 mg olopatadine hydrochloride, equivalent to 1 mg of pure olopatadine.

The preservative in the formulation is benzalkonium chloride at 0.01%. Inactive ingredients include dibasic sodium phosphate, sodium chloride, hydrochloric acid, sodium hydroxide, and purified water.

What Conditions Do Patanol Eye Drops Treat?

Patanol is FDA-approved for the treatment of signs and symptoms of allergic conjunctivitis, targeting itching, redness, inflammation, watering, and burning caused by common allergens including pollen, ragweed, grass, animal hair, and dander.

Common allergens that trigger the conditions Patanol treats:

Tree, grass, and weed pollen
Ragweed and other seasonal plants
Animal hair and pet dander
Dust mites and household dust
Mold spores

These allergens cause mast cells in the eye to release histamine, the chemical responsible for allergy symptoms. Patanol addresses both the immediate and delayed phases of this allergic response through its dual mechanism of action.

Clinical studies demonstrated Patanol was effective when dosed twice daily for up to 6 weeks. Challenge studies confirmed it significantly outperformed placebo in preventing ocular itching when subjects were exposed to allergens immediately and up to 8 hours after dosing.

How Do Patanol Eye Drops Work in the Eye?

Patanol works through a dual mechanism as both a mast cell stabilizer and an H1-receptor antihistamine, blocking histamine release at its source while simultaneously blocking histamine from binding to receptors in the eye. This two-pronged approach makes it more effective than single-mechanism alternatives.

Here’s the thing: mast cells in the eye release histamine when they detect allergens. Patanol prevents this release. The result? Fewer allergic symptoms occur, since histamine is the primary chemical mediator of eye allergy reactions including itching and redness.

Clinical research showed Patanol was significantly more effective than placebo in preventing ocular itching associated with allergic conjunctivitis, both initially and up to 8 hours after dosing in antigen challenge studies conducted by Alcon Laboratories.

What Is the Mechanism of Action of Olopatadine?

Olopatadine selectively blocks the H1-receptor in eye tissues, preventing histamine from binding to the receptor and triggering the cascade of allergic symptoms including itching, redness, and inflammation. The H1 receptor is the primary target for antihistamine medications.

And here is the best part: the mast cell stabilizing function of olopatadine addresses the root cause of the allergic response. Mast cells, when triggered by an allergen, release histamine. Olopatadine prevents this release, stopping the allergic reaction before it escalates.

The elimination half-life of olopatadine is 3 hours. Despite this relatively short half-life, clinical evidence supports relief lasting up to 8-12 hours per dose, which is why twice-daily dosing is the standard regimen for the 0.1% formulation.

How Quickly Do Patanol Eye Drops Relieve Symptoms?

Patanol generally produces improvement in allergy eye symptoms within 30 minutes of application, with some users reporting noticeable relief within 3 minutes of applying a single drop to each eye. Relief duration extends up to 12 hours per dose for most patients.

The recommended dosing interval of 6-8 hours aligns with clinical data showing protection against antigen challenge up to 8 hours after dosing. Is morning-and-evening dosing enough? For most patients, yes. One drop in the morning and one in the evening covers most active allergy hours effectively.

One reviewer on Drugs.com reported that olopatadine ‘effectively calmed my eyes down within 3 minutes of one drop per eye and lasted a full 12 hours until evening,’ rating the experience highly and calling it ‘a real game changer’ compared to previous treatments.

What Are the Side Effects of Patanol Eye Drops?

Patanol is generally well-tolerated, with adverse experiences reported in less than 5% of patients in clinical trials. Patanol ranks among the safer ophthalmic antihistamine options available for allergic conjunctivitis management. Most side effects are mild and resolve on their own.

To be clear: the most commonly reported side effects from WebMD and GoodRx sources include headache, cold symptoms, sore throat, and eye discomfort. These typically resolve on their own as the body adjusts to the medication during ongoing treatment.

Local eye reactions can include a burning or stinging sensation immediately after application, transient blurring of vision, and a gritty feeling. These sensations are common with ophthalmic drops and do not typically indicate a serious problem.

What Are the Most Common Side Effects of Patanol?

The most common side effects of Patanol include headache, sore throat, cold symptoms, and eye discomfort such as stinging, burning, or a gritty sensation upon application of the drops. These are typically mild and short-lived.

Common side effects reported by patients:

Headache and dizziness
Sore throat and nasal dryness
Stinging or burning sensation in the eye
Gritty or foreign body sensation in the eye
Temporary blurred vision after application
Sensitivity to light
Dry mouth and change in taste perception
Fatigue or tiredness

Systemic side effects from ophthalmic application are minimal because the topical dose is small. Olopatadine absorbed through the nasolacrimal duct may contribute to minor systemic effects such as fatigue or nasal dryness in some patients.

What Are the Serious Side Effects to Watch For?

Serious side effects of Patanol include severe burning, stinging or irritation after application, eye swelling, significant eye redness, severe discomfort, and crusting or drainage from the eye that may signal infection or adverse reaction requiring immediate care.

Patients should stop using Patanol and contact their doctor at once if severe redness, swelling, burning, stinging, drainage, or crusting develops. These signs may indicate an allergic reaction to benzalkonium chloride or another ingredient in the solution.

Contamination of the dropper tip poses a serious risk. Touching the dropper tip to the eye, fingers, or any surface can introduce bacteria. Contaminated drops can cause an eye infection that may lead to vision loss or serious eye damage, making proper dropper technique critical.

How Should You Use Patanol Eye Drops?

Patanol is applied by tilting the head back, pulling down the lower eyelid to create a small pocket, holding the dropper above the eye, and squeezing exactly one drop into the pocket, then keeping the eye closed for 1-2 minutes after application. Washing hands before use is essential.

Steps to apply Patanol eye drops correctly:

Wash hands thoroughly with soap and water before handling the bottle.
Tilt the head back slightly and look upward.
Pull the lower eyelid down to create a small pocket.
Hold the dropper tip above the eye without touching it.
Squeeze exactly one drop into the lower eyelid pocket.
Close the eye gently and press the inner corner for 1-2 minutes.
Repeat in the other eye if both eyes are affected.
Replace the cap tightly and store at room temperature.

After applying the drop, pressing a finger gently to the inner corner of the eye helps prevent the medication from draining into the nasal passage. This technique, called nasolacrimal occlusion, reduces systemic absorption and increases local eye exposure.

Patanol should be stored at 4 degrees Celsius to 25 degrees Celsius (39 degrees Fahrenheit to 77 degrees Fahrenheit). What if the liquid looks cloudy or discolored? Don’t use it. The solution must be clear and particle-free. The bottle cap must remain tightly closed when not in use.

What Is the Recommended Dosage for Patanol?

The recommended dose of Patanol is one drop in each affected eye two times per day at an interval of 6-8 hours, approved for adults and children 3 years of age and older using the 0.1% olopatadine formulation. Dosing should not exceed two applications per day.

Dosage guidelines by patient group:

Adults: 1 drop per eye, twice daily, 6-8 hours apart
Children 3 years and older: same as adults, 1 drop twice daily
Children under 3 years: not approved for olopatadine 0.1% solution
Children under 2 years: not approved for any olopatadine ophthalmic product
Elderly patients: no dose adjustment needed per clinical studies

Clinical studies showed Patanol was effective when dosed twice daily for up to 6 weeks. If symptoms persist beyond this period, patients should return to their doctor for reassessment rather than continuing treatment indefinitely without supervision.

Can You Use Patanol With Contact Lenses?

Patanol must not be used while wearing contact lenses because it contains benzalkonium chloride, a preservative that can permanently stain and discolor soft contact lenses and may cause eye irritation when absorbed into the lens material.

Contact lenses must be removed before applying Patanol. Patients should wait at least 10 to 15 minutes after instilling the drops before reinserting their lenses. The Canadian product monograph specifies 15 minutes; Drugs.com and Mayo Clinic specify 10 minutes as the minimum.

Patients should not wear contact lenses at all if their eyes are red or irritated. The underlying inflammation from allergic conjunctivitis combined with lens wear can worsen discomfort and delay recovery from the eye allergy condition.

Who Should Not Use Patanol Eye Drops?

Patanol should not be used by anyone with a known allergy to olopatadine or to any other ingredient in the formulation, including the preservative benzalkonium chloride, which can itself cause eye irritation and adverse reactions in sensitive patients.

Patients who should not use Patanol without medical guidance:

Individuals allergic to olopatadine or benzalkonium chloride
Children younger than 3 years of age
Patients with active eye infections
Pregnant or breastfeeding women (consult doctor first)
Contact lens wearers with red or irritated eyes

Patients with any active eye infection should consult their doctor before using Patanol. The medication is not appropriate as a standalone treatment for infectious conjunctivitis. Using it without treating an underlying infection could mask symptoms and delay proper care.

Patients should not drive or operate machinery immediately after applying Patanol, as the drops can cause temporary blurred vision. Full vision clarity must return before resuming activities that require sharp or sustained eyesight.

Is Patanol Safe During Pregnancy and Breastfeeding?

Patanol carries an Australian Pregnancy Category B1 classification, meaning animal studies have not shown evidence of fetal harm, but adequate controlled studies in pregnant women have not been conducted, leaving its safety in human pregnancy unclear.

The product labeling advises patients to inform their doctor if they are pregnant or breastfeeding before using Patanol. The decision to use the medication during pregnancy or lactation requires a risk-benefit assessment by a qualified healthcare provider familiar with the patient’s condition.

Because topical ophthalmic application results in lower systemic exposure than oral dosing, the fetal risk is likely minimal. Breastfeeding mothers should discuss timing of drop administration with their doctor to minimize any potential transfer of olopatadine through breast milk.

What Do Patanol Eye Drop Reviews Say?

Patanol holds an average rating of 8.3 out of 10 on Drugs.com from 24 user reviews, with 79% of reviewers reporting a positive experience and only 8% reporting a negative experience when treating seasonal allergic conjunctivitis. Patient satisfaction is consistently high across review platforms.

On WebMD, Patanol carries an average rating of 3.4 out of 5 from 181 reviews, with approximately 62% reporting a positive effect. The discrepancy between platforms reflects differences in reviewer populations, rating scale conventions, and the mix of prescription versus OTC users.

Across both platforms, users consistently praise Patanol for its speed of action and effectiveness in controlling itching and redness. Is this improvement real? The data says yes. Multiple reviewers describe it as a significant upgrade over other antihistamine eye drops they had tried for seasonal allergies.

What Are the Positive Experiences With Patanol?

Positive reviewers of Patanol consistently highlight its rapid onset of action, with symptoms calming within minutes of application and relief lasting up to 12 hours, making twice-daily dosing sufficient for full-day allergy symptom control.

One reviewer on Drugs.com reported that olopatadine ‘effectively calmed my eyes down within 3 minutes of one drop per eye and lasted a full 12 hours until evening.’ The reviewer cited this as far superior to drops requiring application every 4 hours or hourly throughout the day.

Bottom line: long-term users report the medication is safe for extended use when prescribed by a doctor. One patient noted: ‘Patanol helped me, and the good thing is it’s safe to use long term.’ Twice-daily convenience was frequently cited as a major advantage over other antihistamine eye drops.

What Are Common Complaints About Patanol?

The most frequent complaint about Patanol is its cost as a prescription drug, with some patients citing prices up to $300 for a single 5 mL bottle, a price barrier that made the medication inaccessible to patients without insurance coverage.

In fact, some users report only partial relief for severe allergy sufferers. One reviewer noted: ‘works okay, not a miracle though for my itchy eyes’ and supplemented Patanol with other OTC drops during peak allergy season. Very high allergen exposure can overwhelm antihistamine therapy.

The twice-daily dosing limitation concerns patients with severe morning or evening allergy spikes. Because Patanol can only be used twice daily, some patients feel the 6-8 hour dosing gap leaves them under-protected during peak allergy exposure hours.

Is Patanol Better Than Pataday?

Patanol and Pataday are not competing products but rather the same olopatadine 0.1% formulation sold under different brand names: Patanol was the original prescription brand, and Pataday Twice Daily Relief is its direct OTC successor following the February 2020 rebrand by Alcon.

So what does that actually mean for shoppers? Alcon markets three OTC versions under the Pataday name: Pataday Twice Daily Relief (olopatadine 0.1%, formerly prescription Patanol), Pataday Once Daily Relief (olopatadine 0.2%, formerly prescription Pataday), and Pataday Once Daily Relief Extra Strength (olopatadine 0.7%, formerly prescription Pazeo).

Only Pataday Twice Daily Relief carries FDA approval for reducing eye redness in addition to itching relief. The higher-concentration once-daily versions treat itching effectively but do not carry the redness-reduction indication approved for the 0.1% formulation.

What Is the Difference Between Patanol and Pataday?

The core difference between Patanol and Pataday is olopatadine concentration and dosing frequency: Patanol (now Pataday Twice Daily Relief) contains 0.1% olopatadine and requires twice-daily dosing, while Pataday Once Daily Relief contains 0.2% and requires only once-daily administration.

Comparison of olopatadine eye drop versions:

Product	Concentration	Dosing	Duration
Pataday Twice Daily Relief (formerly Patanol)	0.1% olopatadine	Twice daily	Up to 12 hours
Pataday Once Daily Relief	0.2% olopatadine	Once daily	Up to 16 hours
Pataday Once Daily Extra Strength (formerly Pazeo)	0.7% olopatadine	Once daily	Up to 24 hours

For most patients, starting with the lowest effective concentration is the recommended approach. The 0.1% version covers twice-daily symptoms effectively. Patients who need all-day coverage without midday re-dosing benefit from stepping up to the 0.2% or 0.7% formulations.

How Much Does Patanol Cost?

Patanol as a prescription drug cost up to $300 for a single 5 mL bottle without insurance coverage. Patanol ranked among the more expensive ophthalmic antihistamines on the market before the February 2020 OTC switch significantly lowered costs.

Since the OTC switch, Pataday Twice Daily Relief is available at standard retail prices without a prescription. The removal of the prescription requirement significantly reduced out-of-pocket costs for most patients who previously paid full prescription prices.

Generic olopatadine ophthalmic 0.1% is also available since the Patanol brand was discontinued in the US. Generic versions are therapeutically equivalent to the brand-name product and are typically available at a fraction of the original brand-name cost.

Is There a Generic or OTC Version of Patanol?

Yes. The Patanol brand was discontinued in the United States, and FDA-approved generic versions of olopatadine ophthalmic 0.1% are now available, alongside the OTC Pataday Twice Daily Relief, which is the direct successor to the original Patanol formulation.

The FDA approved the OTC switch for all three Pataday products in February 2020. Alcon markets them as Pataday Twice Daily Relief, Pataday Once Daily Relief, and Pataday Once Daily Relief Extra Strength. No prescription is required for any of these three products.

Generic olopatadine 0.1% is available over the counter at most pharmacies. Prescription savings programs and pharmacy discount cards can also reduce costs for patients who need higher-concentration versions (0.2% or 0.7%) that may still require a prescription in some markets.

Is Patanol Worth It for Allergy Eye Relief?

Yes. Patanol is a clinically validated, dual-mechanism antihistamine with a strong track record for treating allergic conjunctivitis, effective in studies when dosed twice daily for up to 6 weeks and rated positively by 79% of patients on Drugs.com with an 8.3 out of 10 average rating.

Here’s why that matters: the dual mechanism as both a mast cell stabilizer and H1-receptor antagonist gives it an advantage over single-mechanism alternatives. The approach addresses the allergic response at two points, producing faster and more durable relief for most allergy sufferers.

As Pataday Twice Daily Relief, the olopatadine 0.1% formulation is now accessible over the counter at a significantly lower price than the original prescription product. Generic equivalents reduce costs further. For patients with seasonal or perennial allergic conjunctivitis, olopatadine 0.1% represents a proven, accessible option backed by decades of clinical use.

Who Is Patanol Best Suited For?

Patanol is best suited for adults and children over 3 years old who experience seasonal or year-round allergic conjunctivitis with symptoms of itching, redness, and watering triggered by identifiable allergens.

Patients who need rapid relief within 30 minutes and sustained control throughout an 8-12 hour period without frequent re-dosing benefit most from olopatadine 0.1% twice-daily therapy. The medication fits active individuals who don’t want the interruption of hourly OTC drops.

Patients with very severe allergies or those who need all-day coverage without a midday dose should consider stepping up to Pataday Once Daily Relief (olopatadine 0.2%) or Pataday Once Daily Extra Strength (olopatadine 0.7%), both available OTC at most pharmacies.

Patanol Eye Drops Review: Do They Work for Allergies?