science

Pipamazine

Pipamazine 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 Pipamazine rather than just read about it. In short: Pipamazine (INN; trade names Mornidine, Mometine, Nausidol) is a drug of the phenothiazine class formerly used as an antiemetic. It is chemically related to chlorpromazine, but has negligible antipsychotic activity and produces few extrapyramidal side effects.

Key takeaways

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

Reference excerpt

Pipamazine (INN; trade names Mornidine, Mometine, Nausidol) is a drug of the phenothiazine class formerly used as an antiemetic. It is chemically related to chlorpromazine, but has negligible antipsychotic activity and produces few extrapyramidal side effects. Pipamazine was introduced to the U.S. market in 1959 by G. D. Searle & Company. It was advertised for morning sickness and postoperative nausea and vomiting, and was claimed to reduce the need for postoperative analgesia. It was eventually withdrawn from the U.S. market in 1969, after reports of hepatotoxicity (liver injury). There is very little published information on pipamazine; it is mostly absent from modern-day sources, apart from a few passing mentions in the pharmacological literature.

Adverse effects Mornidine advertisements for postoperative recovery claimed "unusually low side effects". However, contemporary comparative trials found that hypotension (low blood pressure) was a substantial concern when the drug was given at normal dosages for this indication; blood pressure reductions of up to 70 mmHg were reported. Reductions in dosage mitigated hypotension while maintaining antiemetic efficacy. In his book The Creation of Psychopharmacology, Irish psychiatrist David Healy states that the failure of pipamazine to perform as a neuroleptic and its negative side effect profile helped Searle lose interest in the antipsychotic sector, and contributed to the company's refusal to market haloperidol in the United States.

Synthesis

The alkylation of 2-chloro-10-(3-chloropropyl)phenothiazine [2765-59-5] (1) with Isonipecotamide [39546-32-2] (2) gives pipamazine (3).

References

Illustrations

Worked examples

Example 1 — a first encounter with Pipamazine

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

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

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

Frequently asked questions

What is Pipamazine in simple terms?

Why does Pipamazine 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 Pipamazine?

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 Pipamazine.