Drug General Information (ID: DDI7FNWOHY)
Drug Name			Chloroquine		Drug Info		Iodide I-123		Drug Info
Drug Type		Small molecule				Small molecule
Therapeutic Class		Antimalarial Agents				Diagnostic Radiopharmaceuticals
Structure

Mechanism of Chloroquine-Iodide I-123 Interaction (Severity Level: Moderate)
Interference of cell/tissue uptake Click to Show/Hide Mechanism Graph
Drug Name		Chloroquine				Iodide I-123
Mechanism		Interfere with the therapeutic effect and/or diagnostic result of radioiodides				Radioiodide
Key Mechanism Factor 1
		Factor Name		Pharmacokinetics
		Factor Description		Alters the distribution of the drug, leading to changes in the plasma concentration of the drug and affecting the pharmacological effects.
Mechanism Description		Interference of cell/tissue uptake of Iodide I-123 by Chloroquine

Recommended Action
Management		Antithyroid agents such as carbimazole or propylthiouracil should generally be withheld for 1 week before administration of sodium iodide I-131 or I-123, and for a few days afterward. Salicylates, steroids, anticoagulants, antihistamines, antiparasitics, penicillins, sulfonamides, tolbutamide, thiopental, and nitroprusside should generally be withheld for 1 week. Amiodarone, lithium, and benzodiazepines should be withheld for at least 4 weeks.

References
1	Product Information. Rexulti (brexpiprazole). Otsuka American Pharmaceuticals Inc, Rockville, MD.
2	Warrington SJ, Ankier SI, Turner P "Evaluation of possible interactions between ethanol and trazodone or amitriptyline." Neuropsychobiology 15 (1986): 31-7. [PMID: 3725002]
3	Product Information. Sodium Iodide I-123 (sodium iodide I-123). GE Healthcare, Princeton, NJ.