QuetiapineSkip to the navigation
Quetiapine is used to treat symptoms associated with psychiatric disorders, such as delusions, hallucinations, disorganized thinking and speech, and bizarre behavior. It is in a class of antipsychotic drugs known as dibenzapines.
Common brand names:Seroquel, Seroquel XR
Summary of Interactions with Vitamins, Herbs, & Foods
Replenish Depleted Nutrients
Reduce Side Effects
In a small double-blind study, people with schizophrenia being treated with risperidone experienced an improvement in their symptoms when glycine was added to their treatment regimen.1 The initial amount of glycine used was 4 grams per day; this was increased gradually over a period of 10 to 17 days to a maximum of 0.8 grams per 2.2 pounds of body weight per day.
Potential Negative Interaction
Ingestion of grapefruit or grapefruit juice may increase the absorption of quietiapine by inhibiting an enzyme that breaks down the drug in the intestinal tract 2. Consumption of grapefruit products could therefore increase both the effectiveness and the adverse effects of this drug. People taking quietiapine should not use grapefruit products without medical supervision.The interaction is supported by preliminary, weak, fragmentary, and/or contradictory scientific evidence.
1. Heresco-Levy U, Ermilov M, Lichtenberg P, et al. High-dose glycine added to olanzapine and risperidone for the treatment of schizophrenia. Biol Psychiatry 2004;55:165-71.
2. Fuhr U. Drug interactions with grapefruit juice. Extent, probable mechanism and clinical relevance. Drug Saf 1998;18:251-72.
Last Review: 03-18-2015
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