Drug reference
radioactive iodine (123i)
diagnostic radiopharmaceutical · diagnostic agent
diagnostic radiopharmaceuticaldiagnostic agent
CDSCO approved
EXCRETION
—
not curated
INTERACTIONS
—
none in our sources
PREGNANCY
—
not curated
Mechanism
Primarily a short-lived γ-emitter.
Indications
diagnostic studies of thyroid function24-h radioactive iodine uptake (RAIU) test
Pharmacokinetics
Half-life
13 h
Related guidelines
Hypothyroidism in adults
ITS · Endocrinology · 2021
Coronary angiography with renal dysfunction
CSI · Cardiology · 2020
Functional (psychogenic non-epileptic) seizures
AAN · Neurology · 2026
Hypothyroidism in adults
ENDOCRINE_SOCIETY · Endocrinology · 2014
Fluid and electrolyte management in diabetes
RSSDI · Endocrinology · 2025
Other diagnostic radiopharmaceutical drugs
Ask House about radioactive iodine (123i)
Continue into a citation-backed clinical answer with the drug context already attached.
Sources: Goodman & Gilman 14e·Verified: 2026-05-10 · House clinical team