Answer
They may detect rare bone-marrow or liver problems and can measure medicine concentrations when interactions, pregnancy, toxicity or uncertain response make this useful.
Sources for this answer
- Ethosuximide 250 mg capsules, soft Epesri 250 mg capsules, soft — Current selected SmPCemc · Summary of Product Characteristics
- Ethosuximide Neuraxpharm 500 mg/5 ml oral solution — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.