Abstract
The effects of haloperidol, risperidone, and thioridazine on the pharmacokinetics and side-effect profile of quetiapine were investigated in 36 patients with schizophrenia, schizoaffective disorder, or bipolar disorder in a single-center, two-period, multiple-dose, open-label, randomized trial. Over a one-to two-week period, quetiapine doses were escalated to 300 mg twice daily (bid). Patients were then treated for at least 7 days at the target quetiapine dose and subsequently entered into the combination therapy period, receiving haloperidol (7.5 mg, bid), risperidone (3 mg, bid), or thioridazine (200 mg, bid) for 8.5 days (after 3 days of dose escalation). Key assessments included the pharmacokinetics of quetiapine at steady state (area under the curve within a dosing interval [AUCtSS], maximum [CmaxSS], and minimum [CminSS] observed plasma concentrations, and oral clearance [Cl/f]), as well as the UKU Side Effect Rating Scale scores and safety evaluations. Neither risperidone nor haloperidol had significant effects on quetiapine pharmacokinetics. However, thioridazine produced statistically significant changes, decreasing the least squares means values of the AUCtSS, CmaxSS, and CminSS by 40%, 47%, and 31%, respectively, and...Continue Reading
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