Ioduro Di Potassio Serb (Potassium Iodide)

Potassium Iodide acts on thyroid iodine uptake pathways and is used for protection against excess radioactive iodine and for correcting iodine deficiency.

• Radiation emergency: reduces thyroid uptake of radioactive iodine, lowering radiation dose to the gland.
• Iodine deficiency prevention: supplies stable iodide to support normal thyroid hormone synthesis.
• Nuclear medicine procedures: helps prevent unintended thyroid accumulation of diagnostic or therapeutic radioiodine.

• Potassium Iodide dissociates to release stable iodide ions that competitively inhibit the sodium‑iodide symporter in thyroid follicular cells. By saturating the gland with non‑radioactive iodide, it blocks the uptake of radioactive iodine isotopes, thereby reducing thyroid radiation exposure and providing essential iodine for normal hormone production.

Potassium Iodide may cause several adverse reactions, ranging from mild to severe.

Common Side Effects

• Metallic or salty taste in the mouth.
• Nausea, vomiting or abdominal discomfort.
• Diarrhea or loose stools.
• Mild skin rash or itching.
• Headache or dizziness.

Serious or Rare Side Effects

• Anaphylactic or severe allergic reactions.
• Iodide‑induced hyperthyroidism or hypothyroidism.
• Iodide nephropathy or renal dysfunction.
• Severe skin reactions such as Stevens‑Johnson syndrome.
• Pulmonary edema in susceptible individuals.

When using Potassium Iodide, consider the following precautions to ensure safe administration.

• Pregnancy: consult a healthcare professional as data are limited.
• Breastfeeding: use with caution; monitor infant iodine exposure.
• Pre‑existing thyroid disease: assess thyroid function before administration.
• Renal impairment: monitor kidney function and adjust use as needed.
• Concomitant medications: review potential interactions with thyroid‑affecting drugs.
• Store at ambient temperature: keep in the original container, protect from moisture and light.

Potassium Iodide can interact with several medications; awareness of major and moderate interactions helps prevent adverse outcomes.

Major Interactions (Avoid)

• Levothyroxine therapy: may reduce the effectiveness of thyroid hormone replacement.
• Amiodarone: combined iodine load can exacerbate thyroid dysfunction.
• Lithium: increased risk of thyroid abnormalities.
• Antithyroid drugs (e.g., methimazole, propylthiouracil): antagonistic effect on iodine utilization.

Moderate Interactions (Monitor Closely)

• ACE inhibitors or potassium‑sparing diuretics: monitor for hyperkalemia.
• Radiocontrast agents: cumulative iodine exposure may affect thyroid.
• Diuretics that alter electrolyte balance: observe potassium and iodine levels.