High-Fiber Diet and Serum Tricyclic Antidepressant Levels

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The role of dietary fiber as a cause of antidepressant malabsorption has received little attention. Three patients are described who had previously been successfully treated with tricyclic antidepressants and subsequently became refractory to treatment after commencing a high-fiber diet. Serum antidepressant levels were decreased while the patients ingested the high-fiber diets and rose when the fiber content of the diet was reduced. Clinical improvement of their depression followed the concomitant rise in serum tricyclic antidepressant levels. (J Clin Psychopharmacol 1992;12:438–440)

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