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Fluoxetine-induced tricyclic toxicity: extent and duration
1Department of Psychiatry and Behavioral Sciences, University of Oklahoma, Oklahoma City 73190.
Journal of Clinical Pharmacology
|April 1, 1991
Summary
Combining fluoxetine with tricyclic antidepressants can cause dangerous increases in tricyclic drug levels. Careful monitoring and dose adjustments are crucial when initiating this combined therapy.
Area of Science:
- Pharmacology
- Clinical Toxicology
Background:
- Tricyclic antidepressants (TCAs) are often used for depression.
- Combined fluoxetine-tricyclic medication is recommended for nonresponders to TCAs alone.
Observation:
- Three cases showed significant (100-300%) increases in tricyclic blood levels after adding fluoxetine.
- Post-fluoxetine TCA dose reductions did not correlate well with blood level decreases.
Findings:
- Fluoxetine significantly elevates tricyclic blood levels, potentially leading to toxicity.
- The long half-life of fluoxetine necessitates anticipating these increases in advance.
Implications:
- Clinicians must carefully monitor tricyclic levels when co-prescribing fluoxetine.
- A cautious approach and tentative dosing strategy are recommended for combined therapy.