biology

Granisetron

Granisetron is a biology 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 Granisetron rather than just read about it. In short: Granisetron is a serotonin 5-HT3 receptor antagonist used as an antiemetic to treat nausea and vomiting following chemotherapy and radiotherapy. Its main effect is to reduce the activity of the vagus nerve, which is a nerve that activates the vomiting center in the medulla oblongata.

Key takeaways

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

Reference excerpt

Granisetron is a serotonin 5-HT3 receptor antagonist used as an antiemetic to treat nausea and vomiting following chemotherapy and radiotherapy. Its main effect is to reduce the activity of the vagus nerve, which is a nerve that activates the vomiting center in the medulla oblongata. It does not have much effect on vomiting due to motion sickness. This drug does not have any effect on dopamine receptors or muscarinic receptors. Granisetron was developed by chemists working at the British drug company Beecham c. 1985 and is available as a generic. It is produced by Roche Laboratories under the trade name Kytril. The drug was approved in the United Kingdom in 1991 and in United States in 1994 by the FDA. A granisetron transdermal patch with the trade name Sancuso was approved by the US FDA on September 12, 2008. Sancuso is manufactured by 3M Drug Delivery Systems for Kyowa Kirin, Inc. It was patented in 1985 and approved for medical use in 1991. Granisetron is a therapeutic alternative on the World Health Organization's List of Essential Medicines.

Medical uses

Chemotherapy It may be used for chemotherapy-induced nausea and vomiting and appears to work about the same as ondansetron. The most common side-effects of chemotherapy treatment are nausea, vomiting and diarrhea. This is one type of drug that a doctor can prescribe to prevent, lessen, or relieve discomfort.

Post operative A number of medications including granisetron appear to be effective in controlling post-operative nausea and vomiting (PONV). It is unclear if it is more or less effective than other agents such as droperidol, metoclopramide, or ondansetron.

Gastroparesis The granisetron patch (Sancuso) has been studied for use in gastroparesis, though it is not FDA approved for this indication.

Other Is a possible therapy for nausea and vomiting due to acute or chronic medical illness or acute gastroenteritis Treatment of cyclic vomiting syndrome although there are no formal trials to confirm efficacy.

Adverse effects Granisetron is a well-tolerated drug with few side effects. Headache, dizziness, and constipation are the most commonly reported side effects associated with its use. There have been no significant drug interactions reported with this drug's use. It is broken down by the liver's cytochrome P450 system and it has little effect on the metabolism of other drugs broken down by this system.

Extended release An extended release injectable version of granisetron, known as Sustol is also available in the United States as of 2016. The long acting form is used for the treatment of both acute and delayed CINV in moderately emetogenic chemotherapy and anthrocycline and/or cyclophosphamide (AC) highly emetogenic regimens. In its review, the FDA did not grant the broad HEC label to the drug citing the focus on AC regimens, primarily breast-cancer, and lack of data.

References

Illustrations

Worked examples

Example 1 — a first encounter with Granisetron

Start with the simplest possible case. Write down what Granisetron claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Granisetron 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 Granisetron 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 Granisetron

In research: Granisetron appears in biology 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 Granisetron 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: Granisetron is common in secondary-school and first-year university syllabi. It links to neighbouring topics 5-HT3 antagonists, Antiemetics, Cancer treatments, so understanding it makes those chapters shorter.
In everyday life: Look for Granisetron 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 Granisetron in 20 minutes

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

Frequently asked questions

What is Granisetron in simple terms?

Why does Granisetron matter?

Because it connects several biology 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 Granisetron?

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 Granisetron.