Drug General Information (ID: DDIRZV5UO1)
Drug Name			Dextropropoxyphene		Drug Info		Hydroxychloroquine		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Analgesics				Antimalarial Agents
Structure

Mechanism of Dextropropoxyphene-Hydroxychloroquine Interaction (Severity Level: Major)
Increased risk of prolong QT interval Click to Show/Hide Mechanism Graph
Drug Name		Dextropropoxyphene				Hydroxychloroquine
Mechanism		Prolong QT interval				Prolong QT interval
Key Mechanism Factor 1
		Factor Name		QT interval
		Factor Description		Long QT syndrome is a heart signaling disorder that can cause a fast, chaotic heartbeat (arrhythmia). Many people may not exhibit symptoms, and usually the condition is detected during routine medical tests. In others, the most common symptoms include: sudden fainting, palpitations, dizziness, seizures, sudden death.
Mechanism Description		Increased risk of prolong QT interval by the combination of Dextropropoxyphene and Hydroxychloroquine

Recommended Action
Management		Coadministration of chloroquine or hydroxychloroquine with other drugs that can prolong the QT interval should generally be avoided, particularly in patients with baseline QT prolongation (e.g., QTc >=500 msec) or congenital long QT syndrome. Close monitoring of QTc interval, electrolyte levels, and renal and hepatic function is recommended if concomitant use is required and benefits are anticipated to outweigh the risks. Electrolyte abnormalities should be corrected prior to initiating treatment with chloroquine or hydroxychloroquine. Patients should be advised to seek prompt medical attention if they experience symptoms that could indicate the occurrence of torsade de pointes such as dizziness, lightheadedness, fainting, palpitation, irregular heart rhythm, shortness of breath, or syncope. Because chloroquine and hydroxychloroquine are eliminated slowly from the body, the potential for drug interactions should be observed for a prolonged period following their discontinuation.

References
1	Product Information. Hydroxychloroquine Sulfate (hydroxychloroquine). Prasco Laboratories, Cincinnati, OH.
2	Mercuro NJ, Yen CF, Shim DJ, et.al "Risk of QT interval prolongation associated with the use of hydroxychloroquine with or without concomitant azithromycin among hospitalized patients testing positive for coronavirus disease 2019 (COVID-19)" JAMA Cardiol May 1:e201834 (2020): epub ahead of print. [PMID: 32936252]
3	US Food and Drug Administration "FACT SHEET FOR HEALTH CARE PROVIDERS EMERGENCY USE AUTHORIZATION (EUA) OF CHLOROQUINE PHOSPHATE SUPPLIED FROM THE STRATEGIC NATIONAL STOCKPILE FOR TREATMENT OF COVID-19 IN CERTAIN HOSPITALIZED PATIENTS. Available from: URL: https://www.fda.gov/media/13653" ([2020, Apr 27]):.