biology

Latanoprost

Latanoprost is a biology 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 Latanoprost rather than just read about it. In short: Latanoprost, sold under the brand name Xalatan among others, is a medication used to treat increased pressure inside the eye (intraocular pressure). This includes ocular hypertension and open-angle glaucoma.

Key takeaways

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

Reference excerpt

Latanoprost, sold under the brand name Xalatan among others, is a medication used to treat increased pressure inside the eye (intraocular pressure). This includes ocular hypertension and open-angle glaucoma. Latanaprost is applied as eye drops to the eyes. Onset of effects is usually within four hours, and they last for up to a day. Common side effects include blurry vision, redness of the eye, itchiness, and darkening of the iris. Latanoprost is in the prostaglandin analogue family of medications. It works by increasing the outflow of aqueous fluid from the eyes through the uveoscleral tract. Latanoprost was approved for medical use in the United States and the European Union in 1996. It is on the World Health Organization's List of Essential Medicines. Latanoprost is available as a generic medication. In 2023, it was the 67th most commonly prescribed medication in the United States, with more than 9 million prescriptions. It is available as a fixed-dose combination with netarsudil as netarsudil/latanoprost and with timolol as latanoprost/timolol.

Medical uses In the United States, latanoprost is indicated for the reduction of elevated intraocular pressure in people with open-angle glaucoma or ocular hypertension.

Open-angle glaucoma

In people with ocular hypertension (IOP ≥21 mm Hg) including open-angle glaucoma, treatment with latanoprost reduced IOP levels by 22-39% over 1 to 12 months' treatment. Latanoprost is more effective than timolol 0.5% twice daily in 3 of 4 large (n = 163 to 267) randomised, double-blind trials. Latanoprost demonstrated a stable long-term IOP-lowering effect in 1- or 2-year continuations of these trials, with no sign of diminishing effect during prolonged treatment. Meta-analysis suggests that latanoprost is more effective than timolol in lowering intraocular pressure (IOP). However, it often causes iris pigmentation. While current evidence suggests that this pigmentation is benign, careful lifetime evaluation of patients is still justified.

Closed-angle glaucoma People who had elevated IOP despite iridotomy and/or iridectomy (including people of Asian descent), latanoprost was significantly more effective than timolol in two double-blind, monotherapy trials (8.2 and 8.8 mm Hg vs 5.2 and 5.7 mm Hg for latanoprost vs timolol at 12 and 2 weeks, respectively).

Adverse effects Listed from most to least common:

> 5–15%: blurred vision, burning and stinging, conjunctival hyperemia, foreign body sensation, itching, increased (brown) pigmentation of the iris (causing heterochromia), punctate epithelial keratopathy 4%: cold or upper respiratory tract infections, flu-like syndrome 1–4%: dry eyes, excessive tearing, eye pain, lid crusting, lid edema, lid erythema (hyperemia), lid pain, photophobia 1–2%: chest pain, allergic skin reactions, arthralgia, back pain, myalgia < 1 % (only severe or life-threatening effects): asthma, herpes keratitis, iritis, keratitis, retinal artery embolus, retinal detachment, toxic epidermal necrolysis, uveitis, vitreous hemorrhage from diabetic retinopathy A single case report links latanoprost use to the progression of keratoconus. Research suggests that wiping the eye with an absorbent pad after the administration of eye drops can result in shorter eyelashes and a lesser chance of hyperpigmentation in the eyelid, compared to not wiping off excess fluid.

Pregnancy

Interactions Interactions are similar to other prostaglandin analogs. Paradoxically, the concomitant use of latanoprost and bimatoprost or other prostaglandins may result in increased intraocular pressure. Non-steroidal anti-inflammatory drugs (NSAIDs) can reduce or increase the effect of latanoprost.

Pharmacology

Mechanism of action Like other prostaglandin analogues, latanoprost acid is an analog of prostaglandin F2α that acts as a selective agonist at the prostaglandin F receptor. Prostaglandins increase the sclera's permeability to aqueous fluid. By giving latanoprorost, it increases prostaglandin's scleral activity, increasing outflow of aqueous fluid and lowering intraocular pressure. The outflow of aqueous fluid would reduce the intraocular pressure in the eye, reducing the likelihood of complications such as optic nerve damage and visual field loss.

Pharmacokinetics Latanoprost is absorbed well through the cornea. As an ester prodrug, it completely hydrolyses to the active latanoprost acid upon absorption to become biologically active. Highest concentrations of the acid in the aqueous humour are reached two hours after application, lowering of intraocular pressure starts after 3 to 4 hours, with its highest effect found after 8 to 12 hours, and its effect still present for at least 24 hours. When latanoprost acid reaches the circulation, it is quickly metabolised in the liver by fatty acid beta oxidation to 1,2-dinor- and 1,2,3,4-tetranor-latanoprost acid; blood plasma half life is only 17 minutes. The metabolites are mainly excreted via the kidney, with 88% of the topical dose and 98% of an intravenous dose being recovered in the urine respectively. The activation and deactivation pathway is analogous to the one of tafluprost (at least up to the tetranor-metabolite); compare Tafluprost#Pharmacokinetics.

Chemistry

Stability Latanoprost exhibits thermal and solar instability. The concentration of latanoprost stored at 50 °C will decrease by 10% every 8.25 days. When stored at 70 °C the concentration will decrease by 10% every 1.32 days. Ultraviolet light, for example in sunlight, causes rapid degradation of latanoprost.

Society and culture

Legal status Latanoprost was approved for medical use in the United States and the European Union in 1996. In September 2023, the Committee for Medicinal Products for Human Use of the European Medicines Agency adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Catiolanze, intended for the reduction of elevated intraocular pressure in adults with open angle glaucoma or ocular hypertension and in children from four years and adolescents with elevated intraocular pressure and pediatric glaucoma. The applicant for this medicinal product is Santen Oy. Catiolanze was approved for medical use in the European Union in November 2023.

Brand names Latanoprost is sold under many brand names including Xalatan, Iyuzeh, Xelpros, and Catiolanze. In the US, Xalatan is marketed by Viatris after Upjohn was spun off from Pfizer.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Latanoprost

Start with the simplest possible case. Write down what Latanoprost claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Latanoprost 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 Latanoprost 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 Latanoprost

In research: Latanoprost appears in biology 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 Latanoprost 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: Latanoprost is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alkene derivatives, Carboxylate esters, Cyclopentanes, so understanding it makes those chapters shorter.
In everyday life: Look for Latanoprost 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 Latanoprost in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Latanoprost 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 Latanoprost out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Latanoprost in simple terms?

Why does Latanoprost matter?

Because it connects several biology 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 Latanoprost?

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 Latanoprost.