Answer
They may help investigate toxicity, altered seizure control, interactions or physiological changes affecting phenobarbital concentrations. Other tests may assess blood cells, liver function or related complications.
Sources for this answer
- Phenobarbital Colonis 50 mg/5 ml Oral Suspension — Current selected SmPCemc · Summary of Product Characteristics
- Phenobarbital Sodium 30mg/ml Injection — Current selected SmPCemc · Summary of Product Characteristics