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In vitro antimicrobial activity of 18 phenothiazine derivatives: structure-activity relationship
P Bourlioux1, J M Moreaux, W J Su
1Faculty of Pharmacy, Chatenay-Malabry, France.
Abstract:
The antimicrobial activity of 18 phenothiazine derivatives has been evaluated against aerobic and anaerobic bacteria. The mean of the MIC reveals five active drugs against the bacterial strains tested: thioridazine, chlorpromazine, trifluoperazine, fluphenazine and triflupromazine. The other derivatives are less active and some show no antimicrobial activity. It seems that in vitro antibacterial activity alone is insufficient to explain certain intestinal diseases linked to the use of these molecules in psychiatry.
Insights
Five phenothiazine derivatives show antimicrobial activity against tested bacteria. However, in vitro antibacterial effects may not fully explain intestinal issues associated with psychiatric drug use.
Area of Science:
- Pharmacology
- Microbiology
- Medicinal Chemistry
Background:
- Phenothiazine derivatives are widely used in psychiatric medications.
- Some phenothiazines are known to possess antimicrobial properties.
- The relationship between phenothiazine use and gastrointestinal side effects requires further investigation.
Purpose of the Study:
- To evaluate the in vitro antimicrobial activity of 18 phenothiazine derivatives.
- To identify which phenothiazine derivatives exhibit significant antibacterial effects.
- To explore the potential link between antibacterial activity and observed intestinal diseases in patients.
Main Methods:
- Antimicrobial activity testing against aerobic and anaerobic bacteria.
- Determination of Minimum Inhibitory Concentration (MIC) for each derivative.
- Comparative analysis of the activity spectrum of different phenothiazine compounds.
Main Results:
- Five phenothiazine derivatives demonstrated notable antimicrobial activity: thioridazine, chlorpromazine, trifluoperazine, fluphenazine, and triflupromazine.
- The remaining derivatives exhibited lower or no significant antimicrobial activity.
- A clear correlation between in vitro antibacterial potency and the occurrence of intestinal diseases was not established.
Conclusions:
- Thioridazine, chlorpromazine, trifluoperazine, fluphenazine, and triflupromazine are the most potent antimicrobial phenothiazines among those tested.
- In vitro antibacterial activity alone is insufficient to elucidate the mechanisms behind intestinal diseases associated with phenothiazine therapy.
- Further research is needed to understand the complex interactions between phenothiazines, gut microbiota, and host physiology.