54 patients in five centres participated in a study of the relationship between steady-state plasma-levels of amitriptyline (AT) and its active metabolite nortriptyline (NT) and therapeutic response. The participants were inpatients who, after a 7-12 day period of assessment, were rated greater than or equal to 16 on the Hamilton rating scale for depression. They were given 75 mg of amitriptyline for 3 days and then 150 mg daily for an active-treatment period of 6 weeks. Clinical ratings and plasma-samples were obtained at baseline then at 2, 4, and 6 weeks after starting therapy. Contrary to the findings of three previous trials, no important correlations were found between steady-state plasma-levels and therapeutic outcome or corrected side-effects. Corrected side-effects correlated negatively with therapeutic outcome. There seems little advantage in routine monitoring of AT and NT, since variations in plasma-levels do not account for the considerable variation in therapeutic outcome.
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