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Pharmacology · Agents Used in Psychiatry and Neurology

Thioxanthene derivatives

*Thioxanthenum*

Thioxanthene derivatives are a pharmacological group of antipsychotics, with chlorprothixene as the primary representative. These drugs possess a characteristic spectrum of psychotropic activity and are widely used in medical practice.

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Main drugChlorprothixene is the main representative of the thioxanthene derivative group.
Antidepressant propertyExhibits moderate antidepressant activity in addition to its sedative effect.
SafetyIn therapeutic doses, it practically does not cause extrapyramidal symptoms.
2 min readFor medical studentsUpdated 09/24/2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesReviewed by medical editor: Aulov A. A., general practitioner · 09/24/2026

Pharmacodynamic profile of chlorprothixene

The spectrum of action of the group's main representative is largely similar to chlorpromazine (aminazine).

  • Main effects: pronounced sedative and antiemetic, as well as adrenoblocking and anticholinergic effects.
  • Potentiation: the drug enhances the effect of general anesthetics, hypnotics, and narcotic analgesics.
  • Features: antipsychotic activity is less pronounced compared to chlorpromazine, but moderate antidepressant activity is present.

Safety profile and dosing

Side effects of chlorprothixene are similar to those observed with chlorpromazine, but are less pronounced.

  • Extrapyramidal system: in therapeutic doses, the drug practically does not cause extrapyramidal symptoms.
  • Low doses: due to the predominance of the sedative component, they are prescribed for sleep disorders, neurotic disorders, and pruritus.
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Clinical application

Indications for the appointment of thioxanthene derivatives cover various pathological conditions:

  1. Treatment of psychoses, including alcoholic psychoses.
  2. Relief of nausea and vomiting as an antiemetic agent.
  3. Correction of neurotic disorders and sleep disturbances (in low doses).
  4. Elimination of pruritus (as part of low-dose therapy).

Antipsychotics of other chemical groups

This category includes drugs that differ significantly in their spectrum of action:

  • Diphenylbutylpiperidine derivatives (pimozide): the spectrum of action is close to haloperidol. It has a prolonged effect upon oral administration, but is not used in acute psychoses due to the complete absence of sedative action.
  • Indole derivatives (dicarbine/carbidine): a "soft" antipsychotic with pronounced antidepressant activity and central adrenoblocking action. Indicated for various forms of schizophrenia with a deep depressive component and in alcoholic psychoses.

Briefly: answers to topical questions

What is the mechanism of action of thioxanthene derivatives at the receptor level?

The mechanism of action of thioxanthene derivatives, like other antipsychotics, consists in the blockade of central nervous system receptors.

Main and additional mechanisms:

  • Dopamine receptors — blockade of postsynaptic D₂-receptors (main effect) and presynaptic D₃-receptors.
  • Serotonin receptors — blockade of 5-HT receptors.
  • Norepinephrine receptors — blockade of α₁-adrenergic receptors.
  • Histamine receptors — blockade of H₁-receptors.
  • Acetylcholine receptors — blockade of M-cholinergic receptors.

What specific side effects occur when taking chlorprothixene?

Side effects of chlorprothixene are similar to those of chlorpromazine, but less pronounced. In therapeutic doses, chlorprothixene practically does not cause extrapyramidal symptoms.

Class and exam questions

How do thioxanthene derivatives differ from chlorpromazine?

They have a weaker antipsychotic activity, but possess a moderate antidepressant component, and side effects are manifested to a lesser degree.

Does chlorprothixene cause extrapyramidal symptoms?

In therapeutic doses, this drug practically does not cause extrapyramidal symptoms.

What is chlorprothixene prescribed for in low doses?

Low doses are used due to the sedative component in neurotic disorders, sleep disturbances, and pruritus.

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What else to study on this topic

  • Comparison of the antipsychotic activity of chlorprothixene and chlorpromazine
  • Pharmacokinetic features of diphenylbutylpiperidine derivatives
  • Mechanisms of central adrenoblocking activity of indole derivatives
  • Use of antipsychotics in alcoholic psychoses
  • Features of schizophrenia therapy with a depressive component

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