Drugs & toxicology

Amitriptyline (+ nortriptyline) unit converter

Tricyclic antidepressant, monitored together with its metabolite nortriptyline

Also known as: Elavil, Amitriptylin

Converter

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

ng/mL mg/L µg/dL

Worked example

140 ng/mL (middle of the reference range) = 0.14 mg/L

Conversion formulas

mg/L	mg/L = ng/mL × 0.001	ng/mL = mg/L × 1000
µg/dL	µg/dL = ng/mL × 0.1	ng/mL = µg/dL × 10

Reference range

Unit	Adults
ng/mL	80 – 200
mg/L	0.08 – 0.2
µg/dL	8 – 20

Source: Therapeutic Drug Monitoring in Psychiatry (Pharmaceuticals 2024), AGNP reference ranges · Last reviewed: 2026-10-14

Note from the source: AGNP consensus reference range of amitriptyline plus nortriptyline 80-200 ng/mL

Frequently asked questions

How do I convert Amitriptyline (+ nortriptyline) from ng/mL to mg/L?

mg/L = ng/mL × 0.001. In the other direction: ng/mL = mg/L × 1000.

What is the reference range of Amitriptyline (+ nortriptyline)?

For adults the range is 80 – 200 ng/mL (Therapeutic Drug Monitoring in Psychiatry (Pharmaceuticals 2024), AGNP reference ranges). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Amitriptyline (+ nortriptyline)?

Common units are ng/mL, mg/L, µg/dL.