science

Pecazine

Pecazine 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 Pecazine rather than just read about it. In short: Pecazine (INN), also known as mepazine (trade name Pacatal), is a phenothiazine formerly used as a neuroleptic drug or major tranquilizer. Pecazine was first synthesized in 1953 by Wilhelm Schuler and Otto Nieschulz and was quickly incorporated into psychiatric practice as an ataractic, i.e., a true tranquilizer rather than a hypnotic or depressant.

Key takeaways

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

Reference excerpt

Pecazine (INN), also known as mepazine (trade name Pacatal), is a phenothiazine formerly used as a neuroleptic drug or major tranquilizer. Pecazine was first synthesized in 1953 by Wilhelm Schuler and Otto Nieschulz and was quickly incorporated into psychiatric practice as an ataractic, i.e., a true tranquilizer rather than a hypnotic or depressant. It was considered interchangeable with chlorpromazine, albeit with a different side effect profile, which included less sedation and a lower risk of extrapyramidal symptoms due to its potent parasympatholytic and anticholinergic effect. As early as 1958, however, studies reported inferiority to other phenothiazines in the treatment of schizophrenia and questioned its place in the clinic; in 1960, a double-blind, randomized controlled trial found pecazine to be no more effective than placebo. Subsequent research found that, like the structurally related promethazine, pecazine is essentially devoid of antipsychotic activity. Pecazine was implicated in a number of cases of agranulocytosis and was subsequently withdrawn from the market. More recently, it has become a subject of research interest as a MALT1 and RANKL inhibitor.

References

Illustrations

Worked examples

Example 1 — a first encounter with Pecazine

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

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

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

Frequently asked questions

What is Pecazine in simple terms?

Why does Pecazine 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 Pecazine?

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 Pecazine.