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[Cyclosporin (CyA) and H2 antagonists]
V Filingeri1, R Rosati, A Iacona
1Clinica Chirurgica, II Università degli Studi di Roma.
Minerva Medica
|May 1, 1990
Summary
This study found that Cimetidine and Ranitidine increase Ciclosporin (CyA) serum levels in rats, likely due to enhanced hepatotoxicity. Famotidine did not show this interaction, suggesting specific H2-receptor antagonist effects.
Area of Science:
- Pharmacology
- Toxicology
- Drug Interactions
Background:
- Ciclosporin (CyA) is an immunosuppressant with a narrow therapeutic index.
- H2-receptor antagonists are commonly used to reduce stomach acid.
- Potential drug interactions between CyA and H2-receptor antagonists require investigation.
Purpose of the Study:
- To investigate the potential pharmacokinetic and pharmacodynamic interactions between Ciclosporin (CyA) and various H2-receptor antagonists.
- To determine if co-administration affects CyA serum levels and potential hepatotoxicity.
Main Methods:
- An experimental study was conducted using rats.
- Rats were treated with Ciclosporin (CyA) alone and in combination with Cimetidine, Ranitidine, or Famotidine.
- Serum levels of CyA were measured to assess drug interactions.
Main Results:
- Serum levels of Ciclosporin (CyA) were significantly higher in rats treated with CyA and Cimetidine.
- A similar increase in CyA serum levels was observed when CyA was co-administered with Ranitidine.
- No significant change in CyA serum levels was detected when co-administered with Famotidine.
Conclusions:
- Cimetidine and Ranitidine may increase Ciclosporin (CyA) serum concentrations in rats.
- This interaction is potentially linked to increased hepatotoxicity when CyA is combined with Cimetidine or Ranitidine.
- Famotidine does not appear to interact with Ciclosporin (CyA) in this experimental model, suggesting a selective interaction profile for H2-receptor antagonists.