pentobarbital will reduce the level or influence of alosetron by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Slight/Significance Unfamiliar.pentobarbital will reduce the extent or result of etoposide by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep track of.Induction of microsomal enzymes by this drug, could