phenobarbital

As a noun phenobarbital

is (pharmaceutical drug) a barbiturate drug used as a sedative.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between butalbital and phenobarbital

is that butalbital is a barbiturate drug while phenobarbital is a barbiturate drug used as a sedative.

As nouns the difference between phenobarbital and phenobarbitol

is that phenobarbital is a barbiturate drug used as a sedative while phenobarbitol is an alternative spelling of phenobarbital.

As nouns the difference between phenobarbital and valium

is that phenobarbital is a barbiturate drug used as a sedative while valium is a drug, now known as diazepam.

As nouns the difference between taxonomy and phenobarbital

is that taxonomy is the science or the technique used to make a classification while phenobarbital is a barbiturate drug used as a sedative.

As nouns the difference between phenobarbital and phenobarb

is that phenobarbital is (pharmaceutical drug) a barbiturate drug used as a sedative while phenobarb is (informal|uncountable) the drug phenobarbital or phenobarbitone.

As nouns the difference between phenobarbital and primidone

is that phenobarbital is a barbiturate drug used as a sedative while primidone is an anticonvulsant of the pyrimidinedione class whose active metabolites, phenobarbital and phenylethylmalonamide, are also anticonvulsants.