chemistry

Olopatadine

Olopatadine is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Olopatadine rather than just read about it. In short: Olopatadine, sold under the brand name Patanol among others, is an antihistamine medication used to decrease the symptoms of allergic conjunctivitis and allergic rhinitis (hay fever). It is used as eye drops or as a nasal spray.

Key takeaways

Olopatadine belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Olopatadine to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Olopatadine from memory before moving on to harder problems.

Reference excerpt

Olopatadine, sold under the brand name Patanol among others, is an antihistamine medication used to decrease the symptoms of allergic conjunctivitis and allergic rhinitis (hay fever). It is used as eye drops or as a nasal spray. The eye drops generally result in an improvement within half an hour. Common side effects include headache, sore throat, eye discomfort, or changes in perception of taste. More significant side effects may include sleepiness. It is unclear if use during pregnancy or breastfeeding is safe. It is an antihistamine and mast cell stabilizer. Olopatadine was patented in 1986 and came into medical use in 1997. It is available as a generic medication. In 2023, it was the 269th most commonly prescribed medication in the United States, with more than 900,000 prescriptions.

Medical uses Olopatadine is an active ingredient in eye drops designed to alleviate allergic conjunctivitis, a condition characterized by itchy, red, and watery eyes. It is intended to serve as a superior alternative to eye drops that contain corticosteroids. By utilizing olopatadine, the goal is to minimize the side effects associated with corticosteroids. These side effects include elevated intraocular pressure, which can lead to glaucoma, and an increased susceptibility to infections. In nasal sprays, olopatadine is used either as a standalone active ingredient, or in a combination with mometasone, a corticosteroid. A fixed-dose combination of olopatadine hydrochloride 665 μg and mometasone furoate 25 μg is called "GSP301".

Side effects Known side effects for olopatadine eye drops include headache, eye burning or stinging, blurred vision, dry eyes, foreign body sensation, hyperemia, keratitis, eyelid edema, pruritus, asthenia, sore throat (pharyngitis), rhinitis, sinusitis, taste perversion, and vomiting. Olopatadine nasal spray may cause side effects such as nosebleeds, painful nasal sores, fever, urinary discomfort, nasal congestion, cough, throat irritation, a bitter taste, drowsiness, headaches, rashes, and repeated instances of painful urination.

Chemistry

Synthesis

Pharmacology

Pharmacodynamics Olopatadine acts as a selective antagonist of the histamine H1 receptor, thus stabilizing mast cells and inhibiting histamine release.

History Olopatadine was patented in 1986 by Kyowa Hakko Kogyo and came into medical use in 1997. In the United States, Pataday Twice Daily Relief was first approved by the FDA in 1996, under the name Patanol as a prescription drug and was indicated for the treatment of the signs and symptoms of allergic conjunctivitis (referring to ocular redness and itching due to allergies). Pataday – now Pataday Once Daily Relief – was first approved by the FDA in 2004, as a prescription drug and was indicated for the treatment of ocular itching associated with allergic conjunctivitis. These drugs are mast cell stabilizers, which work by preventing the release of histamine and therefore prevent or control allergic disorders. In February 2020, Pataday Twice Daily Relief and Pataday Once Daily Relief were switched to be over-the-counter drugs in the United States when the FDA granted the approvals of the nonprescription products to Alcon.

Society and culture

Brand names Brand names include Pallada, Pazeo, Pataday, Patanol S, Patanol, Opatanol, Olopat, Patanase. It is also available as an oral tablet in Japan under the tradename Allelock, manufactured by Kyowa Hakko Kogyo.

References

External links "Olopatadine Nasal Spray". MedlinePlus.

Illustrations

A package of generic formulation of olopatadine eye drops sold under the brand name Pallada

Worked examples

Example 1 — a first encounter with Olopatadine

Start with the simplest possible case. Write down what Olopatadine claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Olopatadine before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Olopatadine ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Olopatadine

In research: Olopatadine appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Olopatadine in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Olopatadine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dibenzoxepins, Dimethylamino compounds, Drugs developed by Alcon, so understanding it makes those chapters shorter.
In everyday life: Look for Olopatadine outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Olopatadine in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Olopatadine means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Olopatadine out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Olopatadine in simple terms?

Why does Olopatadine matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Olopatadine?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Olopatadine.