Abstract
The effects of fluoxetine and imipramine on the pharmacokinetics and nonpsychiatric side effect profile of quetiapine fumarate were investigated in 26 patients with schizophrenia, schizoaffective disorder, or bipolar disorder in a multicenter, two-period, multiple-dose, open-label, randomized trial. Over a 1- to 2-week period, patients were titrated to a 300-mg twice-daily dose of quetiapine. Patients treated for at least 7 days at the target dose entered a combination therapy period, receiving fluoxetine (60 mg daily) or imipramine (75 mg twice daily) for 8 days. Key assessments included pharmacokinetic analysis of quetiapine, the Udvalg for kliniske undersøgelser (UKU) Side Effect Rating Scale, and safety evaluations (e.g., adverse events, electrocardiograms, laboratory tests, and vital signs). Fluoxetine increased the quetiapine area under the plasma concentration time curve during a 12-hour interval (+12%), maximum plasma concentration during the dosing interval (C(ss)(max); +26%), and minimum plasma concentration at the end of the dosing interval (+8%), although it decreased oral clearance (-11%). The change in C(ss)(max) was statistically although not clinically significant. Imipramine did not affect the pharmacokinetics ...Continue Reading
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