chemistry

Indinavir

Indinavir 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 Indinavir rather than just read about it. In short: Indinavir (IDV; trade name Crixivan, made by Merck) is a protease inhibitor used as a component of highly active antiretroviral therapy to treat HIV/AIDS. It is soluble white powder administered orally in combination with other antiviral drugs.

Key takeaways

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

Reference excerpt

Indinavir (IDV; trade name Crixivan, made by Merck) is a protease inhibitor used as a component of highly active antiretroviral therapy to treat HIV/AIDS. It is soluble white powder administered orally in combination with other antiviral drugs. The drug prevents protease from functioning normally. Consequently, HIV viruses cannot reproduce, causing a decrease in the viral load. Commercially sold indinavir is indinavir anhydrous, which is indinavir with an additional amine in the hydroxyethylene backbone. This enhances its solubility and oral bioavailability, making it easier for users to intake. It was synthetically produced for the purpose of inhibiting the protease in the HIV virus. It is no longer recommended for use in HIV/AIDS treatment due to its side effects. Furthermore, it is controversial for many reasons starting from its development to its usage. It was patented in 1991 and approved for medical use in 1996, on March 13 by the United States Food and Drug Administration, on October 1 by the Australian Therapeutic Goods Administration and on October 4 by the European Medicines Agency.

Medical uses Indinavir does not cure HIV/AIDS, but it can extend the length of a person's life for several years by slowing the progression of the disease. The type that is widely used and created by Merck is indinavir sulfate. The pills are created from sulfate salts and are sold in dosages of 100, 200, 333, and 400 mg of indinavir. It is normally used as one of the three drugs in a triple-combination therapy for the HIV virus. Commercially available capsules should be stored at 15 – 30 °C. It should be kept in a tight container so that it is kept away from moisture. Therefore, it is advised that users should keep the pills in the manufacturer-provided bottle and do not remove the desiccant.

Indinavir wears off quickly after dosing. Unboosted indinavir requires a very precise dosing of 800 mg every eight hours to thwart HIV from forming drug-resistant mutations, including resistances to other protease inhibitors. Boosted indinavir requires two 400-mg indinavir capsules with 1 to 2 100-mg ritonavir capsules twice a day. In both cases, the drugs must be taken with plenty of water one or two hours after a meal. It is recommended that users drink at least 1.5 liters a day when intaking the drug. Drug users must significantly increase their water intake due to indinavir's low solubility that can cause it to crystallize. There are restrictions on what sorts of food may be eaten concurrently with the unboosted indinavir treatment. Furthermore, it is no longer recommended to use in the United States for initial treatments due to pill burden and risk of kidney stones.

Viral resistance Many people were skeptical of being too hopeful with indinavir due to previous events that occurred with AZT. Viral resistance to the drug leads to the drug becoming useless since the virus evolves to have an enzyme that is able to resist the protease inhibitor. In order to avoid this as much as possible, it is important for users to consistently take the exact amount of the drug at the allocated times. This fear of viral resistance caused a lot of users to be wary of the drug.

Side effects The most common side effects of indinavir include:

Gastrointestinal disturbances (abdominal pain, diarrhea, nausea, vomiting) General malaise and fatigue Nephrolithiasis/urolithiasis (the formation of kidney stones), which sometimes may lead to more severe condition including kidney failure Metabolic alterations including hyperlipidemia (cholesterol or triglyceride elevations) and hyperglycemia Alterations in body shape (lipodystrophy), colloquially known as "Crix belly" Increased levels of Bilirubin, causing skin and white parts of the eyes to turn yellow Inhibits urinary nitrous oxide production and may inhibit nitric oxide production. Renal abnormalities, sterile leukocyturia, and reduced creatinine clearance. Impairs endothelial function in healthy HIV-negative men and may accelerate atherosclerotic disease.

Chemical properties

Indinavir is a white crystalline powder. It is very soluble in water and methanol. Each capsule contains sulfate salt in addition to anhydrous lactose and magnesium stearate. The capsule shell is made of gelatin and titanium dioxide. Its melting point or its temperature of decomposition is 150 – 153 °C at which it starts to emit toxic vapors such as nitrogen oxides and sulfur oxides.

The drug fits inside the protease, stopping it from functioning normally. As a result, structural proteins, resulting from polypeptide products of gag and gag-pol genes, cannot form. These structural proteins are necessary for the synthesis of new HIV virions. Eventually, the viral load decreases because of the lack of reproduction.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Indinavir

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

In research: Indinavir 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 Indinavir 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: Indinavir is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2-Pyridyl compounds, CYP3A4 inhibitors, Carboxamides, so understanding it makes those chapters shorter.
In everyday life: Look for Indinavir 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 Indinavir in 20 minutes

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

Frequently asked questions

What is Indinavir in simple terms?

Why does Indinavir 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 Indinavir?

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 Indinavir.