science

Idraparinux

Idraparinux 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 Idraparinux rather than just read about it. In short: Idraparinux sodium is an anticoagulant medication in development by Sanofi-Aventis. It has a similar chemical structure and the same method of action as fondaparinux, but with an elimination half-life about five to six times longer (an increase from fondaparinux's 17 hours to approximately 80 hours), which means that the drug should only need to be injected once a week.

Key takeaways

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

Reference excerpt

Idraparinux sodium is an anticoagulant medication in development by Sanofi-Aventis. It has a similar chemical structure and the same method of action as fondaparinux, but with an elimination half-life about five to six times longer (an increase from fondaparinux's 17 hours to approximately 80 hours), which means that the drug should only need to be injected once a week. Supriya Dey et al recently reported shortest chemical synthesis of Idraparinux for the large-scale production. Sanofi discontinued the development of idraparinux sodium.

Negative clinical trial A phase III trial of idraparinux sodium for stroke prevention in patients with AF (AMADEUS) was halted prematurely due to excessive clinically relevant and intracranial bleeding. Bleedings were particularly increased in elderly patients and those with renal impairment. Sanofi discontinued the development of idraparinux sodium in favour of a biotinylated formulation of the drug called idrabiotaparinux sodium.

Method of action Idraparinux selectively blocks coagulation factor Xa. See Heparin: Mechanism of anticoagulant action for a comparison of the mechanism of heparin, low-molecular-weight heparins, fondaparinux and idraparinux.

Idrabiotaparinux Idrabiotaparinux sodium is also administered once-weekly. It has the same pentasaccharidic structure as idraparinux sodium, but with biotin attached, which allows its neutralisation with avidin, an egg-derived protein with low antigenicity. Sanofi conducted three phase III trials of idrabiotaparinux sodium between 2006 and 2008 in approximately 13,550 patients. In one phase III trial (the BOREALIS-AF study), idrabiotaparinux sodium was non-inferior to warfarin in preventing the recurrent venous thromboembolism at three months in patients with pulmonary embolism and the incidence of clinically relevant bleeding was lower in the idrabiotaparinux sodium arm. The drug was expected to be filed for stroke prevention in patients with atrial fibrillation in 2011. The study was prematurely terminated, and the reason remains unclear. However, Sanofi has since discontinued its development. The company announced in May 2011 that the drug is available for licensing. A systematic review found that until now there is not sufficient evidence to clarify whether idraparinux or idrabiotaparinux are as effective and safe as the standard warfarin treatment for venous thromboembolism prevention. Idraparinux or idrabiotaparinux decreased major bleeding rate significantly but had a trend to increase the all-cause mortality compared with warfarin.

References

8. Supriya Dey, Hong Jay Lo and Chi Huey Wong “ An efficient Modular One pot synthesis of Heparin-Based Anticoagulant Idraparinux” J. Am. Chem. Soc. 2019, 141, 10309

Illustrations

Worked examples

Example 1 — a first encounter with Idraparinux

Start with the simplest possible case. Write down what Idraparinux 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 Idraparinux 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 Idraparinux 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 Idraparinux

In research: Idraparinux 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 Idraparinux 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: Idraparinux is common in secondary-school and first-year university syllabi. It links to neighbouring topics Drugs not assigned an ATC code, Heparins, Oligosaccharides, so understanding it makes those chapters shorter.
In everyday life: Look for Idraparinux 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 Idraparinux in 20 minutes

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

Frequently asked questions

What is Idraparinux in simple terms?

Why does Idraparinux 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 Idraparinux?

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 Idraparinux.