Drug Interaction Report

ADJUST DOSING INTERVAL: Iodine-containing products may affect the pharmacokinetics, pharmacodynamics, and/or diagnostic results of radioiodides. These effects may last up to 8 weeks.

MANAGEMENT: Iodine preparations including expectorants, vitamins, topicals, and intravascular iodine-containing contrast media should be withheld for at least 2 to 4 weeks and possibly longer, and cholecystographic agents should be withheld for more than 4 weeks, prior to administration of sodium iodide I-131 or I-123.

MONITOR: Excessive intake of dietary iodine (e.g., iodised salt) may interfere with adequate uptake of radioiodide by the thyroid .

MANAGEMENT: A diet low in iodine is recommended before initiating therapy with sodium iodide I-131 or I-123.

ADJUST DOSING INTERVAL: Certain drugs may affect the pharmacokinetics, pharmacodynamics, and/or diagnostic results of radioiodides.

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.