Pentobarbital will lessen the level or outcome of etonogestrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Check. pentobarbital will minimize the extent or influence of disopyramide by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Minimal/Significance Not known. fentanyl transdermal and pentobarbital both improve sedation. Avoid or Use Alternate Drug... https://side-effects-of-nembutal06059.tinyblogging.com/the-single-best-strategy-to-use-for-nembutal-and-seconal-are-both-examples-of-74698873