Fenyramidol
Fenyramidol (INN) or phenyramidol (BAN, USAN), trade name Cabral, is a pharmaceutical drug which acts as a muscle relaxant. Drug Interactions 
Fenyramidol inhibits the metabolism of phenytoin, leading to possible increases in plasma phenytonin levels. References 

Aminopyridines
Drugs with unknown mechanisms of action
Phenylethanolamines