science

Etravirine

Etravirine is a science 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 Etravirine rather than just read about it. In short: Etravirine (ETR), sold under the brand name Intelence is an antiretroviral medication used for the treatment of HIV. Etravirine is a human immunodeficiency virus type 1 (HIV-1) non-nucleoside reverse transcriptase inhibitor (NNRTI).

Key takeaways

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

Reference excerpt

Etravirine (ETR), sold under the brand name Intelence is an antiretroviral medication used for the treatment of HIV. Etravirine is a human immunodeficiency virus type 1 (HIV-1) non-nucleoside reverse transcriptase inhibitor (NNRTI). Unlike agents in the class, resistance to other NNRTIs does not seem to confer resistance to etravirine. Etravirine is marketed by Janssen, a subsidiary of Johnson & Johnson. In January 2008, the US Food and Drug Administration (FDA) approved its use for people with established resistance to other drugs, making it the 30th anti-HIV drug approved in the United States and the first to be approved in 2008. It was also approved for use in Canada in April 2008. Etravirine is licensed in the United States, Canada, Israel, Russia, Australia, New Zealand, and the European Union, and is under regulatory review in Switzerland.

Medical uses In the US, etravirine is indicated for the treatment of HIV-1 infection in treatment-experienced patients aged two years of age and older. In the EU, etravirine, in combination with a boosted protease inhibitor and other antiretrovirals, is indicated for the treatment of human-immunodeficiency-virus-type-1 (HIV-1) infection in antiretroviral-treatment-experienced people aged six years of age and older.

Contraindication People with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency or glucose-galactose malabsorption should not take this etravine.

Adverse effects In 2009, the FDA prescribing information for etravirine was modified to include "postmarketing reports of cases of Stevens–Johnson syndrome, toxic epidermal necrolysis, and erythema multiforme, as well as hypersensitivity reactions characterized by rash, constitutional findings, and sometimes organ dysfunction, including liver failure."

Mechanism of action Etravirine is a second-generation non-nucleoside reverse transcriptase inhibitor (NNRTI), designed to be active against HIV with mutations that confer resistance to the two most commonly prescribed first-generation NNRTIs, mutation K103N for efavirenz and Y181C for nevirapine. This potency appears to be related to etravirine's flexibility as a molecule. Etravirine is a diarylpyrimidine (DAPY), a type of organic molecule with some conformational isomerism that can bind the enzyme reverse transcriptase in multiple conformations, allowing for a more robust interaction between etravirine and the enzyme, even in the presence of mutations.

Chemistry Etravine forms as colourless orthorhombic crystals in space group Pna21. The structures of these and of a number of solvate and salt forms have been reported.

Research Etravine has been studied for use in a drug repositioning application. Etravirine was shown to cause an increase in frataxin production.

References

Illustrations

Worked examples

Example 1 — a first encounter with Etravirine

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

In research: Etravirine appears in science 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 Etravirine 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: Etravirine is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aminopyrimidines, Belgian inventions, CYP3A4 inducers, so understanding it makes those chapters shorter.
In everyday life: Look for Etravirine 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 Etravirine in 20 minutes

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

Frequently asked questions

What is Etravirine in simple terms?

Why does Etravirine matter?

Because it connects several science 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 Etravirine?

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 Etravirine.