The best replacement for phenobarbital is pentobarbital.

The best alternatives to phenobarbital are rated as following:
★★★★★  pentobarbital
★★★  phenytoin
★★  potassium bromide
★★  butalbital
★  phenobarbital
★  keppra
★  phenobarbitone
★  carbamazepine
★  diazepam
★  dilantin

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Speaking about phenobarbital, one probably shouldn't forget about phenytoin.

Other search terms related to phenobarbital and their ratings are:
★★★★★ phenytoin
★★★★★ belladonna
keppra
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Google Trends

Scale is based on the average worldwide traffic of phenobarbital in all years. Click on graph for more.
phenobarbital
pentobarbital
phenytoin