Drugs & toxicology

Topiramate unit converter

Anticonvulsant drug level for therapeutic drug monitoring

Also known as: Topamax, TPM

Converter

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

µg/mL µmol/L mg/dL µg/dL

Worked example

12.5 µg/mL (middle of the reference range) = 36.8 µmol/L

Conversion formulas

µmol/L	µmol/L = µg/mL × 2.947	µg/mL = µmol/L × 0.3394
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

Reference range

Unit	Adults
µg/mL	5 – 20
µmol/L	14.73 – 58.93
mg/dL	0.5 – 2
µg/dL	500 – 2000

Source: Reference ranges for antiepileptic drugs revisited (ILAE ranges), Drug Des Devel Ther 2018 · Last reviewed: 2026-10-14

Note from the source: ILAE 2008 range 5-20 mg/L (15-60 µmol/L)

Frequently asked questions

How do I convert Topiramate 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 Topiramate?

For adults the range is 5 – 20 µg/mL (Reference ranges for antiepileptic drugs revisited (ILAE ranges), Drug Des Devel Ther 2018). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Topiramate?

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