pentobarbital will decrease the level or effect of pimavanserin samhälle affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Bildskärm. Avoid coadministration if possible. Skärm for reduced pimavanserin efficacy. An increase in pimavanserin dosage may be needed.pentobarbital will decrease the level or effect of diazepam buccal by