Drugs & toxicology

Primidone unit converter

Anticonvulsant drug level, metabolized in part to phenobarbital

Also known as: Mysoline

Converter

Enter a value in any unit and all other units fill in.

µg/mL µmol/L mg/dL µg/dL µg/L

Worked example

8.5 µg/mL (middle of the reference range) = 38.9 µmol/L

Conversion formulas

µmol/L	µmol/L = µg/mL × 4.582	µg/mL = µmol/L × 0.2183
mg/dL	mg/dL = µg/mL × 0.1	µg/mL = mg/dL × 10
µg/dL	µg/dL = µg/mL × 100	µg/mL = µg/dL × 0.01
µg/L	µg/L = µg/mL × 1000	µg/mL = µg/L × 0.001

Reference range

Unit	Adults
µg/mL	5 – 12
µmol/L	22.91 – 54.98
mg/dL	0.5 – 1.2
µg/dL	500 – 1200
µg/L	5000 – 12 000

Source: FDA drug label (DailyMed): primidone (Mysoline) · Last reviewed: 2026-10-14

Note from the source: Clinically effective serum level 5-12 mcg/mL (FDA label)

Frequently asked questions

How do I convert Primidone from µg/mL to mg/dL?

mg/dL = µg/mL × 0.1. In the other direction: µg/mL = mg/dL × 10.

What is the reference range of Primidone?

For adults the range is 5 – 12 µg/mL (FDA drug label (DailyMed): primidone (Mysoline)). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Primidone?

Common units are µg/mL, µmol/L, mg/dL, µg/dL, µg/L.