chemistry

Roxithromycin

Roxithromycin 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 Roxithromycin rather than just read about it. In short: Roxithromycin is a semi-synthetic macrolide antibiotic used to treat respiratory tract, urinary and soft tissue infections. It is a derivative of erythromycin - comprising the same 14-membered lactone ring - with an oxime-based side chain attached to the macrolide ring.

Key takeaways

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

Reference excerpt

Roxithromycin is a semi-synthetic macrolide antibiotic used to treat respiratory tract, urinary and soft tissue infections. It is a derivative of erythromycin - comprising the same 14-membered lactone ring - with an oxime-based side chain attached to the macrolide ring. Roxithromycin was patented in 1980 and approved for medical use in 1987. It is available under several brand names in Australia, France, Germany, Israel, South Korea and New Zealand, but not in the United States. Roxithromycin has also been shown to possess antimalarial activity.

Side effects The most common side effects are gastrointestinal: diarrhea, nausea, abdominal pain and vomiting. Less common side effects include central or peripheral nervous system events such as headaches, dizziness, and vertigo. Rarely seen side effects are rashes, abnormal liver function values and alteration in the senses of smell and taste.

Drug interactions

Roxithromycin has fewer interactions than erythromycin as it has a lower affinity for cytochrome P450. Roxithromycin is not known to interact with hormonal contraceptives, prednisolone, carbamazepine, ranitidine or antacids. When roxithromycin is administered with theophylline, some studies have shown an increase in the plasma concentration of theophylline. A change in dosage is usually not required but patients with high levels of theophylline at the start of the treatment should have their plasma levels monitored. Roxithromycin appears to interact with warfarin. This is shown by an increase in prothrombin time and/or international normalised ratio (INR) in patients taking roxithromycin and warfarin concurrently. As a consequence, severe bleeding episodes have occurred.

Available forms Roxithromycin is commonly available as tablets or oral suspension.

Mechanism of action Roxithromycin prevents bacteria from growing, by interfering with their protein synthesis. Roxithromycin binds to the subunit 50S of the bacterial ribosome, and thus inhibits the synthesis of peptides. Roxithromycin has similar antimicrobial spectrum as erythromycin, but is more effective against certain gram-negative bacteria, particularly Legionella pneumophila.

Pharmacokinetics When taken before a meal, roxithromycin is very rapidly absorbed, and diffuses into most tissues and phagocytes. Due to the high concentration in phagocytes, roxithromycin is actively transported to the site of infection. During active phagocytosis, large concentrations of roxithromycin are released.

Metabolism Only a small portion of roxithromycin is metabolised. Most of roxithromycin is secreted unchanged into the bile and some in expired air. Under 10% is excreted into the urine. Roxithromycin's half-life is 12 hours.

History French pharmaceutical company Roussel Uclaf first marketed roxithromycin in 1987.

References

External links "Roxithromycin". Drug Information Portal. U.S. National Library of Medicine. 2022-08-16. Archived from the original on July 24, 2021.

Illustrations

Worked examples

Example 1 — a first encounter with Roxithromycin

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

In research: Roxithromycin 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 Roxithromycin 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: Roxithromycin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dimethylamino compounds, Fourteen-membered rings, Ketoxime ethers, so understanding it makes those chapters shorter.
In everyday life: Look for Roxithromycin 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 Roxithromycin in 20 minutes

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

Frequently asked questions

What is Roxithromycin in simple terms?

Why does Roxithromycin 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 Roxithromycin?

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 Roxithromycin.