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Serum/plasma concentration of primidone (anticonvulsant drug level)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of primidone, a medication used to control certain types of seizures, in your blood.

Quick summary

["Primidone levels help doctors check if your dose is working properly and adjust it as needed."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
73195-0
Short code
Primidone ind plt IgG SerPl Ql FC
Synonyms
Primidone ind plt IgG SerPl Ql FC
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
flow-cytometry
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you’re taking primidone to manage epilepsy or other seizure disorders. It helps ensure the medication is at an effective level without causing too much in your system.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from a vein in your arm. If you’re on a diet or have taken certain supplements, let your provider know.

What the Test Results Mean

Results are used to guide your medication dose. Too little may mean seizures aren’t controlled, while too much could lead to side effects like drowsiness or dizziness. Your provider will discuss these with you.

Common Side Effects of Primidone

Primidone can cause drowsiness, fatigue, or mild dizziness. Rarely, it may affect your balance or coordination. If you experience severe side effects like rash, trouble breathing, or vision changes, seek medical help immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Primidone Level

Frequently asked questions

What does a primidone level tell your doctor?
Primidone levels help assess whether your medication is achieving the right balance for seizure control. Low levels may indicate insufficient dosing, while high levels could signal toxicity or poor metabolism. Regular monitoring is especially important if you’re taking other medications that interact with primidone.
How often should I get this test?
Your provider will determine the frequency based on your treatment plan, seizure history, and other medications. Typically, tests are done every few weeks to months to adjust your dose safely.
Can I drink water before the test?
Yes, you can drink water as usual unless your provider specifies otherwise. Avoid alcohol or caffeine before the test, as they may affect your results.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy