using a reproducible screening procedure for rat liver cytochrome p450 isoenzyme induction/inhibition , five dicarbamate drugs ( meprobamate , mebutamate , carisoprodol , tybamate , and w-554 ) were compared with sodium phenobarbital and found to be from 25 to 100 times less potent hepatic cytochrome p450 inducers than phenobarbital .
C0282303
sodium phenobarbital
C0031412
phenobarbital