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Carbamazepine toxicity resulting from generic substitution
J T Gilman1, L A Alvarez, M Duchowny
1Department of Neuroscience, Miami Children's Hospital, FL 33155.
Neurology
|December 1, 1993
Summary
Generic substitution of Tegretol with Epitol led to carbamazepine toxicity in two children. Increased serum concentrations caused adverse effects, highlighting the importance of monitoring generic drug efficacy.
Area of Science:
- Pharmacology
- Clinical Pharmacy
- Neuroscience
Background:
- Generic substitution is common in healthcare settings.
- Previous reports indicate potential issues with generic anticonvulsants.
- Carbamazepine (Tegretol) is a widely prescribed antiepileptic drug.
Observation:
- Two pediatric cases of carbamazepine toxicity are presented.
- The toxicity occurred after switching from Tegretol to Epitol, a generic formulation.
- Both children experienced elevated serum carbamazepine levels.
Findings:
- Serum carbamazepine concentrations increased by 22% and 41% in the two patients.
- The toxicity symptoms resolved upon dose adjustment and lowering of serum concentrations.
- No residual adverse effects were noted in either child.
Implications:
- This highlights potential therapeutic inequivalence between branded and generic carbamazepine formulations.
- Close monitoring of serum drug levels is crucial after generic substitution of narrow therapeutic index drugs.
- Further studies are warranted to assess the bioequivalence of different carbamazepine generics.