science

Sucroferric oxyhydroxide

Sucroferric oxyhydroxide 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 Sucroferric oxyhydroxide rather than just read about it. In short: Sucroferric oxyhydroxide, sold under the brand name Velphoro, is a non-calcium, iron-based phosphate binder used for the control of serum phosphorus levels in adults with chronic kidney disease (CKD) on hemodialysis (HD) or peritoneal dialysis (PD). It is used in form of chewable tablets.

Key takeaways

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

Reference excerpt

Sucroferric oxyhydroxide, sold under the brand name Velphoro, is a non-calcium, iron-based phosphate binder used for the control of serum phosphorus levels in adults with chronic kidney disease (CKD) on hemodialysis (HD) or peritoneal dialysis (PD). It is used in form of chewable tablets. Sucroferric oxyhydroxide is also known as a mixture of polynuclear iron(III)-oxyhydroxide, sucrose and starches. The most common side effects include diarrhea and discolored feces, which may become less frequent with continued treatment. It was approved for medical use in the United States in November 2013, and in the European Union in August 2014.

Medical uses Sucroferric oxyhydroxide is approved by the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA) for the control of serum phosphorus levels in patients with chronic kidney disease (CKD) on dialysis.

Adverse effects The most frequently reported adverse drug reactions reported from trials were diarrhoea and discoloured faeces. The vast majority of gastrointestinal adverse events occurred early during treatment and abated with time under continued dosing.

Interactions Drug-interaction studies and post hoc analyses of Phase III studies showed no clinically relevant interaction of sucroferric oxyhydroxide with the systemic exposures to losartan, furosemide, omeprazole, digoxin, and warfarin, the lipid-lowering effects of statins, and oral vitamin D receptor agonists. According to the European label (Summary of Product Characteristics), medicinal products that are known to interact with iron (e.g. doxycycline) or have the potential to interact with Velphoro should be administered at least one hour before or two hours after Velphoro. This allows sucroferric oxyhydroxide to bind phosphate as intended and be excreted without coming into contact with medications in the gut that it might interact with. According to the US prescribing information, Velphoro should not be prescribed with oral levothyroxine. The combination of sucroferric oxyhydroxide and levothyroxine is contraindicated because sucroferric oxyhydroxide contains iron, which may cause levothyroxine to become insoluble in the gut, thereby preventing the intestinal absorption of levothyroxine.

Hyperphosphatemia

In a healthy person, normal serum phosphate levels are maintained by the regulation of dietary absorption, bone formation and resorption, equilibration with intracellular stores, and renal excretion. When kidney function is impaired, phosphate excretion declines. Without specific treatment, hyperphosphataemia occurs almost universally, despite dietary phosphate restriction and conventional dialysis treatment. In patients on dialysis, hyperphosphataemia is an independent risk factor for fractures, cardiovascular disease and mortality. Abnormalities in phosphate metabolism such as hyperphosphatemia are included in the definition of the new chronic kidney disease–mineral and bone disorder (CKD-MBD).

Structure and mechanism of action Sucroferric oxyhydroxide comprises a polynuclear iron(III)-oxyhydroxide core that is stabilised with a carbohydrate shell composed of sucrose and starch. The carbohydrate shell stabilises the iron(III)-oxyhydroxide core to preserve the phosphate adsorption capacity. Dietary phosphate binds strongly to sucroferric oxyhydroxide in the gastrointestinal (GI) tract. The bound phosphate is eliminated in the faeces and thereby prevented from absorption into the blood. As a consequence of the decreased dietary phosphate absorption, serum phosphorus concentrations are reduced.

Chewability The chewability of sucroferric oxyhydroxide compares well with that of Calcimagon, a calcium containing tablet used as a standard for very good chewability. Tablets of sucroferric oxyhydroxide easily disintegrated in artificial saliva.

Effectiveness and phosphate binding Clinical Phase III studies showed that sucroferric oxyhydroxide achieves and maintains phosphate levels in compliance with the KDOQI guidelines. The reduction in serum phosphate levels of sucroferric oxyhydroxide-treated patients was non-inferior to that in sevelamer-treated patients. The required daily pill burden was lower with sucroferric oxyhydroxide. Sucroferric oxyhydroxide binds phosphate under empty and full stomach conditions and across the physiologically relevant pH range of the GI tract. In a retrospective, real-world study, hyperphosphatemic peritoneal dialysis patients who were prescribed to switch to sucroferric oxyhydroxide from sevelamer, lanthanum carbonate, or calcium acetate had significant reductions in serum phosphorus levels, along with a 53% decrease in the prescribed daily pill burden.

References

Worked examples

Example 1 — a first encounter with Sucroferric oxyhydroxide

Start with the simplest possible case. Write down what Sucroferric oxyhydroxide 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 Sucroferric oxyhydroxide 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 Sucroferric oxyhydroxide 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 Sucroferric oxyhydroxide

In research: Sucroferric oxyhydroxide 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 Sucroferric oxyhydroxide 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: Sucroferric oxyhydroxide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Phosphate binders, so understanding it makes those chapters shorter.
In everyday life: Look for Sucroferric oxyhydroxide 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 Sucroferric oxyhydroxide in 20 minutes

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

Frequently asked questions

What is Sucroferric oxyhydroxide in simple terms?

Why does Sucroferric oxyhydroxide 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 Sucroferric oxyhydroxide?

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 Sucroferric oxyhydroxide.