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What is a PHENOBARBITONE GARDINAL?

The Phenobarbitone (Gardinal) test is a therapeutic drug monitoring blood test used to measure the level of phenobarbitone; a barbiturate prescribed for epilepsy and seizure disorders. Since phenobarbitone has a narrow therapeutic range, monitoring is essential to ensure effective seizure control while avoiding toxicity. This test is performed to guide dosage adjustments, assess treatment compliance, and prevent side effects such as drowsiness, confusion, or respiratory depression, ensuring safe and effective long-term management of patients on phenobarbitone therapy.

Additional Information

Also known as/ Other names: Phenobarbital Level Test, Phenobarbitone Serum Level, Gardinal Drug Level, Phenobarbital Therapeutic Drug Monitoring
Parameters: 1
Recommended for: M/F/Others
Sample Type: Blood
Patient Preparation: Recommended specimen: just before the next dose is due at steady state.
Reports: Next Day

FAQs

Why is this test important?

It helps prevent underdosing, which may cause seizures, and overdosing, which can lead to toxicity and serious side effects.

Who should undergo this test?

Patients taking phenobarbitone for epilepsy or seizure disorders are recommended for regular monitoring.

What happens if the test shows low levels?

Low levels may indicate inadequate seizure control, requiring dose adjustment.

What happens if the test shows high levels?

High levels suggest toxicity, which can cause drowsiness, confusion, or respiratory depression.

Can medications affect the test results?

Yes, other drugs may interact with phenobarbitone, altering its blood levels.

What are the risks of not testing?

Without monitoring, patients risk uncontrolled seizures or dangerous drug toxicity.

Can phenobarbitone toxicity be prevented?

Yes, regular monitoring and dose adjustments help prevent toxicity.

What conditions are linked to phenobarbitone use?

Phenobarbitone is mainly prescribed for epilepsy, seizure disorders, and sometimes anxiety or sleep issues.

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