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Drug interaction between metoprolol and chlordiazepoxide
International Journal of Cardiology
|December 1, 1986
Summary
Chlordiazepoxide partially reversed metoprolol's heart rate slowing effect in rabbits after two weeks of administration. This interaction may involve hepatic enzyme induction, impacting drug metabolism.
Area of Science:
- Pharmacology
- Cardiovascular Physiology
- Drug Interactions
Background:
- Metoprolol is a beta-blocker used to treat cardiovascular conditions.
- Chlordiazepoxide is a benzodiazepine with potential effects on drug metabolism.
Purpose of the Study:
- To investigate the interaction between chlordiazepoxide and metoprolol.
- To determine the effect of chlordiazepoxide on the negative chronotropic properties of metoprolol.
Main Methods:
- Administration of metoprolol and chlordiazepoxide to rabbits.
- Monitoring of heart rate changes (negative chronotropic effect).
- Assessment of drug interaction over a two-week period.
Main Results:
- Chlordiazepoxide partly reversed metoprolol's negative chronotropic effect in 3 of 5 rabbits.
- The observed reversal suggests a potential drug interaction.
Conclusions:
- Concomitant administration of chlordiazepoxide may alter metoprolol's cardiovascular effects.
- Hepatic enzyme induction by chlordiazepoxide is a likely mechanism for this interaction.