Phenobarbital

Phenobarbital is used to control seizures. Phenobarbital is also used to relieve anxiety. It is also used to prevent withdrawal symptoms in people who are dependent ('addicted' , feel a need to continue taking the medication) on another barbiturate medication and are going to stop taking the medication. Phenobarbital is in a class of medications called barbiturates. It works by slowing activity in the brain.

Specimen: Serum

Reference Values:

Therapeutic Range:
Peak Level: 20-40 mg/l 
Trough Level: 5-10 mg/l 

Toxic Range:
Peak Level: >40 mg/l 
Trough Level: >10 mg/l 

Method:   

Loinc: 3948-7