Carbamazepine TDM

Therapeutic drug monitoring for carbamazepine. Calculates dose adjustments based on serum concentration, accounting for autoinduction and pseudolinear pharmacokinetics.

mg/day

Total daily carbamazepine dose in mg

mcg/mL

Steady-state serum carbamazepine concentration

mcg/mL

Therapeutic range is 4-12 mcg/mL

Concurrent phenytoin, phenobarbital, or rifampin will increase clearance

Valproic acid inhibits carbamazepine metabolism and displaces from protein binding

weeks

Autoinduction is complete after ~3-5 weeks at a stable dose

Enter values and click Calculate to see results.

References

  1. Therapeutic Drug Monitoring of Carbamazepine: A 20-Year Observational Study — PMC/MDPI Pharmaceutics (2021). https://pmc.ncbi.nlm.nih.gov/articles/PMC8621251/
  2. Carbamazepine Dosage Guide + Max Dose, Adjustments — Drugs.com (2025). https://www.drugs.com/dosage/carbamazepine.html
  3. Steady-state Carbamazepine Pharmacokinetics following Oral and Stable-Labeled Intravenous Administration — PMC (2014). https://pmc.ncbi.nlm.nih.gov/articles/PMC4038037/