Measurement of Plasma Levels of Clomipramine in the Treatment of Chronic Pain

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Abstract
The analgesic effect of clomipramine and the possible relationships between the antalgic action and the plasma levels of this tricyclic drug have been studied in 30 patients with chronic pain induced by nervous lesions determining a deafferentation. Twenty of 30 patients treated with clomipramine reported a significant improvement (up to 50%) observed as soon as the 4th day, with few side effects. The pharmacokinetic analysis shows the existence (r = 0.358; p less than 0.001) of a relationship between analgesia and plasma levels of clomipramine for each individual patient. This study also indicates a "therapeutic window" of plasma levels between 20 and 85 ng/ml. These results permit discussion of measurement of plasma levels of clomipramine in the treatment of chronic pain.

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