Definition

Noun: 1. A synthetic organic compound, specifically a heterocyclic compound, used primarily as an anthelmintic (de-wormer) in veterinary medicine to treat internal parasite infestations in farm animals. 2. (Chemistry) The parent chemical structure from which a major class of antipsychotic and antihistamine drugs (phenothiazines) are derived. In this context, it refers to the core molecular framework.

Usage Examples

• Noun (Veterinary Use):
  • The veterinarian administered phenothiazine to the herd to control the outbreak of stomach worms.
  • Phenothiazine has been a standard treatment for parasitic infections in livestock for decades.
• Noun (Chemical Core):
  • The phenothiazine nucleus is characterized by a central ring system containing nitrogen and sulfur atoms.
  • Many important neuroleptic drugs are synthesized by modifying the basic phenothiazine structure.

Advanced Usage

• While "phenothiazine" itself is the specific chemical compound, the term is often used metonymically to refer to the entire class of derivative drugs in medical and chemical literature. For example: "The mechanism of action of phenothiazine antipsychotics involves dopamine receptor antagonism." Here, it implicitly refers to drugs the phenothiazine structure.

Variants and Related Words

• Phenothiazines (plural noun): Refers to the broad class of pharmaceutical drugs derived from phenothiazine, used as antipsychotics (e.g., chlorpromazine), antihistamines, and antiemetics.
• Phenothiazine-based (adjective): Describing a drug or compound whose structure is built upon the phenothiazine core.

Synonyms

• (For the veterinary drug): Thiodiphenylamine (an older chemical name), anthelmintic (general class).
• (For the drug class): Neuroleptics, antipsychotics (specifically for the derived pharmaceuticals like chlorpromazine).

Different Meanings

1. Primary Meaning: The specific chemical compound (C₁₂H₉NS) used as a veterinary anthelmintic.
2. Secondary/Chemical Meaning: The fundamental tricyclic chemical skeleton that serves as the precursor for a significant group of medicinal drugs.

Notes on Usage

• In modern contexts, especially in human medicine and pharmacology, the word "phenothiazine" is more frequently encountered in its plural form ("phenothiazines") referring to the derivative drugs rather than the parent compound.
• Its use as a veterinary de-wormer is its most direct and concrete application. When discussing human psychiatry, it is almost exclusively in reference to the derived drug class.

Noun

1. a compound used primarily in veterinary medicine to rid farm animals of internal parasites