Jodek Potasu (Potassium Iodide)

Jodek Potasu is used as a thyroid blocking agent to reduce iodine uptake in several clinical situations.

• Radiation emergency exposure: reduces thyroid uptake of radioactive iodine, lowering radiation dose to the gland.
• Nuclear incident preparedness: provides prophylactic protection for populations at risk of iodine‑131 release.
• Iodine deficiency (off‑label): supplies supplemental stable iodine when dietary intake is insufficient.

• Potassium iodide supplies a large amount of stable iodide that saturates the sodium‑iodide symporter in thyroid follicular cells. This competitive inhibition prevents the organification of radioactive iodine isotopes, thereby limiting their incorporation into thyroid hormone and reducing radiation exposure to the gland.

Potassium iodide may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Nausea or vomiting
• Metallic taste in the mouth
• Mild abdominal discomfort or diarrhea
• Skin rash or itching
• Salivary gland swelling

Serious or Rare Side Effects

• Iodide‑induced hyperthyroidism or hypothyroidism
• Severe allergic reactions (anaphylaxis, angioedema)
• Persistent thyroiditis or goitre development

Potassium iodide should be used with caution in specific populations and clinical conditions.

• Pregnancy: consult a healthcare professional before use.
• Breastfeeding: discuss potential risks with a physician.
• Pre‑existing thyroid disease: monitor thyroid function tests closely.
• Renal impairment: assess renal function and adjust use if necessary.
• Known iodine allergy: avoid administration.
• Store at ambient temperature: keep in the original container, protect from moisture and light.

Potassium iodide can interact with several medications, requiring attention to avoid reduced efficacy or increased toxicity.

Major Interactions (Avoid)

• Thyroid hormone replacement therapy: may interfere with iodine balance.
• Amiodarone: additive iodine load can exacerbate thyroid dysfunction.
• Lithium: combined effect may alter thyroid hormone levels.

Moderate Interactions (Monitor Closely)

• Loop diuretics (e.g., furosemide): may affect potassium and iodine excretion.
• ACE inhibitors: monitor renal function and electrolytes.
• Antacids containing aluminum or magnesium: may reduce iodide absorption.