chemistry

Iloperidone

Iloperidone 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 Iloperidone rather than just read about it. In short: Iloperidone, sold under the brand name Fanapt among others, is an atypical antipsychotic for the treatment of schizophrenia and bipolar I disorder. Medical uses Iloperidone is indicated for the treatment of schizophrenia and mania or mixed episodes in bipolar I disorder.

Key takeaways

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

Reference excerpt

Iloperidone, sold under the brand name Fanapt among others, is an atypical antipsychotic for the treatment of schizophrenia and bipolar I disorder.

Medical uses Iloperidone is indicated for the treatment of schizophrenia and mania or mixed episodes in bipolar I disorder. In a 2013 study in a comparison of 15 antipsychotic drugs in effectivity in treating schizophrenic symptoms, iloperidone demonstrated mild effectiveness — as effective as lurasidone, and 13 to 15% less effective than ziprasidone, chlorpromazine, and asenapine. It generally appears to work better than placebo.

Side effects Examination of the safety and tolerability of iloperidone have shown that at a 5 mg/day dose in healthy male volunteers, the drug was fairly well tolerated, although hypotension, dizziness, and somnolence were very common side effects ranging from mild to moderate in severity. A second study showed that co administration of food decreased the severity of these effects. This study also indicated that repeat administration of iloperidone could decrease the effects of hypotension. The approved dose is 12–24 mg, not 5 mg. However, claims of better tolerance have been reported.

Withdrawal The British National Formulary recommends a gradual taper when discontinuing antipsychotics to avoid acute withdrawal symptoms or rapid relapse. Symptoms of withdrawal commonly include nausea, vomiting, and loss of appetite. Other symptoms may include restlessness, increased sweating, and trouble sleeping. Less commonly there may be a feeling of the world spinning, numbness, or muscle pains. Symptoms generally resolve after a short period of time. There is tentative evidence that discontinuation of antipsychotics can result in psychosis. It may also result in reoccurrence of the condition that is being treated. Rarely tardive dyskinesia can occur when the medication is stopped.

Pharmacology

Iloperidone exerts its effects by acting upon and antagonizing specific neurotransmitters, particularly multiple dopamine and serotonin receptor subtypes. It is considered an 'atypical' antipsychotic because it displays serotonin receptor antagonism, similar to other atypical antipsychotics. The older typical antipsychotics are primarily dopamine antagonists. Iloperidone has been shown to act as an antagonist at all tested receptors except for 5-HT2A. It exhibits high (nM) affinity to serotonin 5-HT2A (Ki value of 5.6 nM) where it acts as a inverse agonist. Antagonism occurs at all other receptors following dopamine D2 (6.3 nM) and D3 (7.1 nM) and α1-adrenergic receptors (0.36 nM), moderate affinity for dopamine D4 (25 nM), serotonin 5-HT6 (43 nM), 5-HT7 (22 nM), and low affinity for the serotonin 5-HT1A (168 nM), dopamine D1, and histamine H1 receptors. In addition, pharmacogenomic studies identified single nucleotide polymorphisms associated with an enhanced response to iloperidone during acute treatment of schizophrenia.

History Hoechst Marion Roussel Inc. made initial inquiries into the drug; however, in May 1996, they discontinued research, and in June 1997 gave research rights to Titan Pharmaceuticals. Titan then handed over worldwide development, manufacturing and marketing rights to Novartis in August 1998. On June 9, 2004, Titan Pharmaceuticals announced that the Phase III development rights have been acquired by Vanda Pharmaceuticals. The original launch date was scheduled for 2002. On November 27, 2007, Vanda Pharmaceuticals announced that the U.S. Food and Drug Administration (FDA) had accepted their New Drug Application for iloperidone, confirming the application is ready for FDA review and approval. On July 28, 2008, the FDA issued a not-approvable letter to Vanda Pharmaceuticals concerning the drug, stating that further trials are required before a decision can be made concerning marketed usage of iloperidone. Iloperidone was approved by the FDA for the treatment of schizophrenia in the United States on May 6, 2009. and for treating bipolar I disorder in April 2024.

See also List of investigational anxiolytics Lidanserin

References

External links Fanapt Prescribing Information

Illustrations

Worked examples

Example 1 — a first encounter with Iloperidone

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

In research: Iloperidone 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 Iloperidone 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: Iloperidone is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1,3-Propanediyl compounds, Aromatic ketones, Atypical antipsychotics, so understanding it makes those chapters shorter.
In everyday life: Look for Iloperidone 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 Iloperidone in 20 minutes

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

Frequently asked questions

What is Iloperidone in simple terms?

Iloperidone, sold under the brand name Fanapt among others, is an atypical antipsychotic for the treatment of schizophrenia and bipolar I disorder. Medical uses Iloperidone is indicated for the treatment of schizophrenia and mania or mixed episodes in bipolar I disorder.

Why does Iloperidone 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 Iloperidone?

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 Iloperidone.