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Inhibition of ciramadol glucuronidation by benzodiazepines
Summary
Benzodiazepines like diazepam can inhibit ciramadol glucuronidation, affecting drug clearance. While lorazepam showed no significant interaction, diazepam may alter ciramadol
Area of Science:
- Pharmacology
- Drug Metabolism
- Drug Interactions
Background:
- Glucuronidation is a key pathway for drug elimination.
- Benzodiazepines are commonly co-administered with various medications.
Purpose of the Study:
- To investigate the in vitro and in vivo interactions between ciramadol glucuronidation and benzodiazepines.
- To determine the potential for drug-drug interactions affecting ciramadol disposition.
Main Methods:
- In vitro studies using human and dog liver microsomes to assess inhibition kinetics.
- In vivo studies in dogs to evaluate the effects of lorazepam and diazepam pretreatment on ciramadol pharmacokinetics.
Main Results:
- Benzodiazepines, particularly diazepam, competitively inhibited ciramadol glucuronidation in vitro.
- In vivo, diazepam significantly reduced ciramadol plasma and oral clearance, prolonging its half-life.
- Lorazepam did not significantly alter ciramadol disposition in vivo.
Conclusions:
- Ciramadol glucuronidation is susceptible to inhibition by certain benzodiazepines.
- Coadministration of lorazepam with ciramadol is unlikely to cause significant drug interactions in humans.
- A potential drug interaction exists between diazepam and ciramadol in humans due to inhibited glucuronidation.