Pentobarbital will decrease the level or impact of fosphenytoin by affecting hepatic enzyme CYP2C9/ten metabolism. Use Caution/Watch. pentobarbital boosts toxicity of methoxyflurane by growing metabolism. Contraindicated. Amplified metabolism of methoxyflurane to nephrotoxic compounds. pentobarbital will lessen the extent or outcome of ritonavir by impacting hepatic/intestinal enzyme ... https://citychemiststore.com/product/buy-nembutal-powder-online/