Rocuronium is a neuromuscular blocking agent acting as a competitive antagonist of acetylcholine. Results of an inhibition of eight individual liver microsomal cytochromes P450 (CYP) are presented. As the patients are routinely premedicated with diazepam, possible interaction of diazepam with rocuronium has been also studied. Results indicated that rocuronium interacts with human liver microsomal CYPs by binding to the substrate site. Next, concentration dependent inhibition of liver microsomal CYP3A4 down to 42% (at rocuronium concentration 189 μM) was found. This effect has been confirmed with two CYP3A4 substrates, testosterone (formation of 6β-hydroxytestosterone) and diazepam (temazepam formation). CYP2C9 and CYP2C19 activities were inhibited down to 75-80% (at the same rocuronium concentration). Activities of other microsomal CYPs have not been inhibited by rocuronium. To prove the possibility of rocuronium interaction with other drugs (diazepam), the effect of rocuronium on formation of main diazepam metabolites, temazepam (by CYP3A4) and desmethyldiazepam, (also known as nordiazepam; formed by CYP2C19) in primary culture of human hepatocytes has been examined. Rocuronium has caused inhibition of both reactions by 20 and 15%, respectively. The results open a possibility that interactions of rocuronium with drugs metabolized by CYP3A4 (and possibly also CYP2C19) may be observed.

• MeSH
• androstanoly metabolismus   farmakologie   MeSH
• cytochrom P-450 CYP3A metabolismus   fyziologie   MeSH
• cytochrom P450 CYP2C19 metabolismus   fyziologie   MeSH
• cytochrom P450 CYP2C9 metabolismus   MeSH
• cytochromy metabolismus   MeSH
• diazepam farmakologie   MeSH
• hepatocyty metabolismus   MeSH
• inhibitory cytochromu P450 MeSH
• jaterní mikrozomy enzymologie   MeSH
• kultivované buňky MeSH
• lékové interakce MeSH
• lidé MeSH
• nervosvalové látky nedepolarizující farmakologie   MeSH
• systém (enzymů) cytochromů P-450 metabolismus   MeSH
• vazebná místa MeSH
• vztah mezi dávkou a účinkem léčiva MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH