What is Sodium Iodide I-123? Uses, warnings & side effects

Updated May 14, 2025  •  Published Oct 29, 2024

Sodium Iodide I-123 overview

BRAND NAMES:

Generic Names:

  • Sodium Iodide I-123

Uses:

  • Used as part of a medical test of the thyroid.

Therapeutic Classes:

  • Diagnostic Agent

Forms:

  • Capsule

How it’s taken:

  • By mouth

What is Sodium Iodide I-123 used for?

What form(s) does Sodium Iodide I-123 come in?

  • Capsule

What are common Sodium Iodide I-123 dosages?

  • Capsule 7.4mbq

How to take Sodium Iodide I-123

  • Oral routeCarefully follow your doctor's instructions about any special diet. You might need to avoid foods and medicines that contain iodine before you have your test.

  • A nurse or other trained health professional will give you this medicine.

  • Your thyroid test will be given six hours after you receive your dose of this medicine.

What to do if you miss a dose of Sodium Iodide I-123

Sodium Iodide I-123 contraindications - Who shouldn't take Sodium Iodide I-123?

  • You may not be able to receive this medicine if you have had an allergic reaction to iodine-containing radiopharmaceuticals.

Sodium Iodide I-123 warnings

  • Make sure your doctor knows if you are pregnant or breastfeeding. Tell your doctor if you have kidney disease, or if you have any allergies to foods or dyes.

  • Chest pain, fast or pounding heartbeat.

Sodium Iodide I-123 interactions & what to avoid when taking Sodium Iodide I-123

  • Make sure your doctor knows if you are using a thyroid medicine such as levothyroxine, methimazole, Cytomel®, Synthroid®, or Tapazole®.

Sodium Iodide I-123 side effects - How does Sodium Iodide I-123 make you feel?

Serious Side Effects

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Chest pain, fast or pounding heartbeat.

Less Serious Side Effects

  • Rash.

  • Nausea or vomiting.

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