chemistry

Sofosbuvir/velpatasvir/voxilaprevir

Sofosbuvir/velpatasvir/voxilaprevir 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 Sofosbuvir/velpatasvir/voxilaprevir rather than just read about it. In short: Sofosbuvir/velpatasvir/voxilaprevir, sold under the brand name Vosevi, is a fixed-dose combination medication for the treatment of hepatitis C. It contains sofosbuvir, a hepatitis C virus (HCV) nucleotide analog NS5B polymerase inhibitor; velpatasvir, an HCV NS5A inhibitor; and voxilaprevir an HCV NS3/4A protease inhibitor.

Key takeaways

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

Reference excerpt

Sofosbuvir/velpatasvir/voxilaprevir, sold under the brand name Vosevi, is a fixed-dose combination medication for the treatment of hepatitis C. It contains sofosbuvir, a hepatitis C virus (HCV) nucleotide analog NS5B polymerase inhibitor; velpatasvir, an HCV NS5A inhibitor; and voxilaprevir an HCV NS3/4A protease inhibitor. The most common adverse reactions include headache, fatigue, diarrhea, and nausea. The combination was approved for medical use in the United States and in the European Union in July 2017. Vosevi is sold by Gilead Sciences.

Medical uses In the US, sofosbuvir/velpatasvir/voxilaprevir is indicated for the treatment of adults with chronic hepatitis C virus infection without cirrhosis (liver disease) or with compensated cirrhosis (Child-Pugh A). In the EU, it is indicated for the treatment of chronic hepatitis C virus infection in people aged twelve years of aged and older and weighing at least 30 kilograms (66 lb).

Adverse effects The FDA label for sofosbuvir/velpatasvir/voxilaprevir contains a boxed warning about the risk of Hepatitis B virus reactivation.

History The safety and efficacy of sofosbuvir/velpatasvir/voxilaprevir was evaluated in two phase III clinical trials that enrolled approximately 750 adults without cirrhosis or with mild cirrhosis. The first trial compared twelve weeks of treatment with the combination versus treatment with placebo in adults with genotype 1 who had previously failed treatment with an NS5A inhibitor drug. Participants with genotypes 2, 3, 4, 5, or 6 all received the combination. The second trial compared twelve weeks of treatment with the combination versus treatment with the previously approved drugs sofosbuvir and velpatasvir in adults with genotypes 1, 2, or 3 who had previously failed treatment with sofosbuvir but not an NS5A inhibitor drug. Results of both trials demonstrated that 96-97 percent of participants who received the combination had no virus detected in the blood 12 weeks after finishing treatment, suggesting that participants’ infection had been cured. The US Food and Drug Administration (FDA) granted the application for sofosbuvir/velpatasvir/voxilaprevir priority review and breakthrough therapy designations. The FDA granted approval of Vosevi to Gilead Sciences Inc.

References

Worked examples

Example 1 — a first encounter with Sofosbuvir/velpatasvir/voxilaprevir

Start with the simplest possible case. Write down what Sofosbuvir/velpatasvir/voxilaprevir 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 Sofosbuvir/velpatasvir/voxilaprevir 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 Sofosbuvir/velpatasvir/voxilaprevir 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 Sofosbuvir/velpatasvir/voxilaprevir

In research: Sofosbuvir/velpatasvir/voxilaprevir 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 Sofosbuvir/velpatasvir/voxilaprevir 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: Sofosbuvir/velpatasvir/voxilaprevir is common in secondary-school and first-year university syllabi. It links to neighbouring topics Combination antiviral drugs, NS3/4A protease inhibitors, NS5A inhibitors, so understanding it makes those chapters shorter.
In everyday life: Look for Sofosbuvir/velpatasvir/voxilaprevir 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 Sofosbuvir/velpatasvir/voxilaprevir in 20 minutes

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

Frequently asked questions

What is Sofosbuvir/velpatasvir/voxilaprevir in simple terms?

Why does Sofosbuvir/velpatasvir/voxilaprevir 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 Sofosbuvir/velpatasvir/voxilaprevir?

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 Sofosbuvir/velpatasvir/voxilaprevir.