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Patanol Eye Drops

PATANOL Eye Drops (Prescription Medicine)

Patanol Eye Drops contain 1.0 mg/mL (0.1%) olopatadine. They are indicated for the treatment of the signs and symptoms of allergic conjunctivitis.

The recommended therapy is one to two drops in the affected eye(s) twice daily.

(Olopatadine) 0.1 % Eye Drops


Eye Drops (sterile, isotonic solution) 1.11 mg/mL olopatadine hydrochloride which is equivalent to 1.0 mg/mL (0.1%) olopatadine: 5 mL DROP-TAINER® dispenser.



Olopatadine hydrochloride, C21H23NO3 •HCl, a dibenzoxepine derivative, is a white, crystalline, water-soluble powder (Figure 1). It has a molecular weight of 373.88 and a melting point of 248°C (decomp). PATANOL Eye Drops contain olopatadine hydrochloride (1.11 mg/mL) which is equivalent to olopatadine (1.0 mg/mL). The inactive ingredients in PATANOL Eye Drops are sodium chloride, sodium phosphate (dibasic) and purified water. The solution is preserved with benzalkonium chloride (0.1 mg/mL).

PATANOL Eye Drops is a sterile, isotonic, preserved solution for topical application to the eye. The solution is buffered to a pH of approximately 7 so that it is within the physiological range of the ocular surface fluid. The solution is clear and colourless to pale yellow and is presented in a DROP-TAINER® bottle.

The active ingredient in PATANOL Eye Drops is olopatadine as its hydrochloride salt, or (Z)-11-[3-(dimethylamino)propylidene]-6-11-dihydrodibenz[b,e]oxepin-2-acetic acid hydrochloride. The CAS registry number for olopatadine hydrochloride is [140462-76-6].


Following topical ocular administration in humans, olopatadine was shown to have low systemic exposure. Two studies in normal volunteers (totalling 24 subjects) dosed bilaterally with olopatadine 0.15% ophthalmic solution once every 12 hours for two weeks demonstrated plasma concentrations to be generally below the quantitation limit of the assay (< 0.5 ng/mL). Samples in which olopatadine was quantifiable were typically found within 2 hours of dosing and ranged from 0.5 to 1.3 ng/mL. The half-life in plasma was approximately 8 - 12 hours and elimination was predominantly through renal excretion. Approximately 60 - 70 % of the dose was recovered in the urine as parent drug. Two metabolites, the mono-desmethyl and the N-oxide, were detected at low concentrations in the urine.


Olopatadine is an anti-allergic compound which has been demonstrated to stabilize human conjunctival tissue mast cells, preventing the release of histamine and other inflammatory mediators. Olopatadine is a selective histamine H1-antagonist (Ki values for Histamine H1, H2 and H3 receptors were 32 nM, 100 (M and 79 (M, respectively) that inhibits Type I immediate hypersensitivity reactions. It has been shown to inhibit the release of pro-inflammatory mediators from human conjunctival mast and epithelial cells. Olopatadine has no significant effects on alpha-adrenergic, dopamine and muscarinic Type 1 and 2 receptors.


The safety of PATANOL Eye Drops was evaluated in 15 clinical studies in which 1,208 patients were evaluated for safety. These studies included three clinical pharmacology plasma level and tear studies, three comfort studies, five conjunctival antigen challenge studies, an environmental study, an adjunct study to loratadine and two additional safety studies. These 15 studies show no clinically significant change observed in visual acuity, pupil diameter, pupillary response, intraocular pressure, dilated fundus parameters, blood chemistry, haematology, urinalysis, pulse or mean arterial pressure in patients receiving PATANOL Eye Drops.

Three studies assessed the comfort of PATANOL relative to other agents. Each included 30 subjects. They were single dose crossover studies in which all subjects received all test agents, and single-blinded because the subjects themselves reported the comfort of the agents tested. In one study olopatadine 0.1% was compared to ketorolac 0.5%. In the two other studies, olopatadine 0.1% was compared to ketorolac 0.5% and levocabastine 0.05%. The studies showed that PATANOL Eye Drops 0.1 % was significantly more comfortable than ketorolac 0.5 % and levocabastine 0.05 %.

Results from three pivotal conjunctival antigen challenge studies involving 278 patients demonstrated that, when subjects were challenged with antigen both initially and up to 8 hours after dosing, PATANOL Eye Drops were significantly more effective than the placebo in preventing chemosis, ocular itching and redness.

Results are also available from a randomised, placebo-controlled study assessing the prophylactic use of PATANOL Eye drops in 132 patients with seasonal allergic conjunctivitis or rhinoconjunctivitis. PATANOL was found to significantly reduce (in comparison to placebo) the effects of pollen counts on ocular itching, redness, sneezing, runny nose, and itchy nose.


PATANOL Eye Drops are indicated for the treatment of the signs and symptoms of allergic conjunctivitis.

Dosage and Administration

The recommended therapy is one to two drops of PATANOL Eye Drops in the affected eye(s) twice daily.


PATANOL Eye Drops are contraindicated in patients hypersensitive to olopatadine hydrochloride or any other component of the preparation (see DESCRIPTION).

Warnings and Precautions

Not for injection or oral ingestion

Use in Pregnancy

Olopatadine was not teratogenic in rats and rabbits at oral doses of 600 mg/kg and 400 mg/kg, respectively (> 90,000 and > 60,000 times the maximum recommended ocular human use level, respectively). Given that animal studies are not always predictive of human responses, and that no adequate and well controlled studies in pregnant women have been performed, it should be carefully considered whether the potential benefit to the mother justifies the potential risk to the embryo or foetus.

Use in Lactation

Olopatadine has been identified in the milk of nursing rats following oral administration. Rat pups of mothers administered olopatadine orally at greater than 4 mg/kg/day showed (625 times - but not at 312 times - the maximum recommended ocular human use level demonstrated) reduced body weight gain during the nursing period. It is not known whether topical ocular administration could result in sufficient systemic absorption to produce detectable quantities in human breast milk. PATANOL Eye Drops should be used with caution in breastfeeding woman.

Use in Children

Safety and effectiveness have not been established in children below 3 years of age.

Carcinogenicity / Mutagenicity / Fertility

Long term studies in mice and rats did not provide any evidence of carcinogenicity at oral olopatadine doses up to 500 mg/kg/day and 200 mg/kg/day, respectively (78,000 and 31,000 times the maximum recommended ocular human use level, respectively). No mutagenic potential was observed when olopatadine was tested in an in vitro bacterial reverse mutation (Ames) test, an in vitro mammalian chromosome aberration assay or an in vivo mouse micronucleus test.

There are no human data addressing the effects of olopatadine on fertility. In animal reproductive/fertility studies, olopatadine had no effect on the fertility of male and female rats at oral doses up to 50 mg/kg/day (7,800 times the maximum recommended ocular human use level). However, decreases in the fertility index, number of corpora lutea and implantation rate were seen at an oral dose of 400 mg/kg/day.

Effect on Ability to Drive or Operate Machinery

Instillation of eye drops may cause transient blurring of vision. Caution should be taken when driving or operating machinery if blurred vision is experienced.

Instruction to Patients

PATANOL contains the preservative benzalkonium chloride, which may be deposited in soft (hydrophilic) contact lenses. Patients who wear soft contact lenses should remove their lenses prior to instilling PATANOL Eye Drops and should not reinsert their lenses until 10 minutes after instillation of the eye drops.

To prevent contaminating the dropper tip and solution, care should be taken not to touch the eyelids or surrounding areas with the dropper tip of the bottle. The bottle should be tightly closed when not in use.

Each bottle of PATANOL Eye Drops should be discarded within 28 days of opening.

Adverse Effects

Headaches have been reported at an incidence of 7 %. The following adverse experiences have been reported in less than 5 % of patients: asthenia, blurred vision, burning or stinging, cold syndrome, dry eye, foreign body sensation, hyperaemia, hypersensitivity, keratitis, lid oedema, nausea, pharyngitis, pruritus, rhinitis, sinusitis and taste perversion. Some of these events are similar to the underlying disease being studied.


Interactions with other medications have not been investigated in vivo. Drug interaction studies on human liver microsomal preparation have shown that olopatadine is not an inhibitor of cytochrome P-450 isozymes 1A2, 2C8/9, 2C19, 2D6, 2E1 or 3A1. PATANOL Eye Drops have low drug interaction potential as systemic levels of olopatadine achieved after ocular dosing are negligible and 60 - 70 % of the drug is excreted unchanged in the urine .


No specific ocular side effects are known for a topical overdosage of PATANOL Eye Drops. Results from studies indicated that topical ocular administration resulted in very low systemic concentrations. Multiple oral doses that resulted in plasma concentrations at least 2 to 3 orders of magnitude greater than those from topical ocular dosing were well tolerated.

A topical overdosage of PATANOL Eye Drops may be flushed from the eye(s) with warm tap water.

If PATANOL Eye Drops are accidentally ingested the following information may be useful. One bottle contains 5 mg of olopatadine. In single dose oral studies, olopatadine was well tolerated up to a dose of 360 mg, with rapid absorption and rapid excretion of the parent drug in the urine. Approximately 84 % of the dose was recovered in the urine as parent drug within the first 24 hours. The most often observed side effect was tiredness usually of a mild to moderate nature, although severe tiredness has been reported.

Pharmaceutical Precautions

Store below 25°C.
Discard container 28 days after opening.

Medicine Classification

Prescription Medicine.

Package Quantities

5 mL DROP-TAINER® dispenser.



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