Chemical Component Summary

FormulaC17 H20 N2 S
Molecular Weight284.42
Isomeric SMILESCN(C)CCCN1c2ccccc2Sc2ccccc12

Chemical Details

Formal Charge0
Atom Count40
Chiral Atom Count0
Chiral Atomsn/a
Bond Count42
Aromatic Bond Count12
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB00420 Different stereochemistry
  • approved
  • vet_approved
DescriptionA phenothiazine with actions similar to chlorpromazine but with less antipsychotic activity. It is primarily used in short-term treatment of disturbed behavior and as an antiemetic. Promazine is not approved for use in the United States.
  • 10-(3-(Dimethylamino)propyl)phenothiazine
  • Frenil
  • N-(3-Dimethylaminopropyl)phenothiazine
  • N-Dimethylamino-1-methylethyl thiodiphenylamine
  • N,N-dimethyl-3-(10H-phenothiazin-10-yl)-propan-1-amine
SaltsPromazine Hydrochloride
Brand Names
  • Promazine HCl Inj 50mg/ml
  • Combelen
  • Prazine
  • Sparine
  • Talofen
Affected OrganismHumans and other mammals
IndicationUsed as an adjunct for short term treatment of moderate and severe psychomotor agitation. Also used to treat agitation or restlessness in the elderly.
PharmacologyPromazine belongs to a group of medications known as the phenothiazine antipsychotics. It acts by blocking a variety of receptors in the brain, particularly dopamine receptors. Dopamine is involved in transmitting signals between brain cells. When there is an excess amount of dopamine in the brain it causes over-stimulation of dopamine receptors. These receptors normally act to modify behaviour and over-stimulation may result in psychotic illness. Promazine hydrochloride blocks these receptors and stops them becoming over-stimulated, thereby helping to control psychotic illness. Promazine has weak extrapyramidal and autonomic side effects which lead to its use in the elderly, for restless or psychotic patients. Its anti-psychotic effect is also weaker and it is not useful in general psychiatry.
Mechanism of actionPromazine is an antagonist at types 1, 2, and 4 dopamine receptors, 5-HT receptor types 2A and 2C, muscarinic receptors 1 through 5, alpha(1)-receptors, and histamine H1-receptors. Promazine's antipsychotic effect is due to antagonism at dopamine and serotonin type 2 receptors, with greater activity at serotonin 5-HT2 receptors than at dopamine type-2 receptors. This may explain the lack of extrapyramidal effects. Promazine does not appear to block dopamine within the tubero-infundibular tract, explaining the lower incidence of hyperprolactinemia than with typical antipsychotic agents or risperidone. Antagonism at muscarinic receptors, H1-receptors, and alpha(1)-receptors also occurs with promazine.
Route of administrationIntramuscular; Intravenous
  • Alpha1 Antagonists
  • Amino Acids
  • Amino Acids, Branched-Chain
  • Amino Acids, Essential
  • Amino Acids, Peptides, and Proteins
CAS number58-40-2

Drug Targets

NameSequence SearchPharmacological ActionActions
Muscarinic acetylcholine receptor M2MNNSTNSSNNSLALTSPYKTFEVVFIVLVAGSLSLVTIIGNILVMVSIKV...unknownantagonist
Muscarinic acetylcholine receptor M2MNNSTNSSNNSLALTSPYKTFEVVFIVLVAGSLSLVTIIGNILVMVSIKV...unknownantagonist
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Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682