Quetiapine/Moderate CYP3A4 Inhibitors that Prolong QT Interactions
This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
Serious. These medicines may interact and cause very harmful effects. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Quetiapine can affect your heart's rhythm. Other drugs can have the same effect and also slow down how quickly your body process quetiapine.
What might happen:
Taking quetiapine with your other medicine can increase the amount of quetiapine in your blood and may increase your risk of irregular heartbeat, which may be life-threatening.
What you should do about this interaction:
Make sure your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together and all other medicines you are taking. Let your doctor know right away if you notice irregular heartbeat, dizziness, fainting, excessive drowsiness, rapid pulse/low blood pressure, weakness, fatigue, dizziness, or muscle stiffness/tremors.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
- 1.Seroquel (quetiapine fumarate) US prescribing information. AstraZeneca Pharmaceuticals LP July, 2011.
- 2.US Food and Drug Administration (FDA). Drug Development and Drug Interactions: Table of Substrates, Inhibitors and Inducers. Available at: https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and- drug-interactions-table-substrates-inhibitors-and-inducers. Updated 11/14/2017.
- 3.Seroquel (quetiapine) Canada prescribing information. AstraZeneca Canada Inc. May 15,2013.
- 4.Drew BJ, Ackerman MJ, Funk M, Gibler WB, Kligfield P, Menon V, Philippides GJ, Roden DM, Zareba W. Prevention of torsade de pointes in hospital settings: a scientific statement from the American Heart Association and the American College of Cardiology Foundation. J Am Coll Cardiol 2010 Mar 2;55(9):934-47.
- 5.Li KY, Li X, Cheng ZN, Zhang BK, Peng WX, Li HD. Effect of erythromycin on metabolism of quetiapine in Chinese suffering from schizophrenia. Eur J Clin Pharmacol 2005 Jan;60(11):791-5.
- 6.This information is based on or an extract from the UW Metabolism and Transport Drug Interaction Database (DIDB) Platform, Copyright University of Washington 1999-2019..
- 7.USDepartment of Health and Human Services Food and Drug Administration. ICH E14 Clinical Evaluation of QT/QTc Interval Prolongation and Proarrhythmic Potential for Non-Antiarrhythmic Drugs. Available at: https://www.fda.gov/media/71372/download October, 2005.
CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.