Jodetten 1 X Wöchentlich (Potassium Iodide)

Potassium Iodide is used to protect the thyroid gland from radioactive iodine exposure.

• Radiation emergency prophylaxis: reduces thyroid uptake of radioactive iodine after nuclear incidents.
• Pre‑treatment for radioactive iodine therapy: blocks thyroid uptake to limit radiation dose during therapeutic procedures.
• Occupational exposure protection: safeguards workers handling iodine‑131.
• Emergency preparedness for children and pregnant women: provides rapid thyroid blockade to minimize radiation risk.

• Potassium Iodide supplies a large amount of stable iodide that saturates the thyroid gland, triggering the Wolff‑Chaikoff effect. This temporary inhibition of iodine organification prevents the gland from absorbing additional radioactive iodine, thereby reducing internal radiation dose to the thyroid tissue.

Potassium Iodide may cause adverse reactions, most of which are mild and transient.

Common Side Effects

• Gastrointestinal discomfort: nausea, abdominal cramps, or mild diarrhea.
• Metallic or salty taste in the mouth.
• Mild skin rash or itching at the site of contact.

Serious or Rare Side Effects

• Iodide‑induced thyroid dysfunction: hypo‑ or hyperthyroidism.
• Severe allergic reaction: anaphylaxis, swelling of the face or throat.
• Acute renal impairment in susceptible individuals.
• Pulmonary edema in rare cases of massive overdose.

Potassium Iodide should be used with caution in specific populations and clinical situations.

• Pregnancy: administer only if the expected benefit outweighs potential risk to the fetus.
• Breastfeeding: consider possible iodine transfer to the infant; evaluate risk‑benefit.
• Pre‑existing thyroid disease: assess thyroid function before use.
• Renal impairment: monitor iodine excretion and adjust use accordingly.
• Drug interactions: avoid concurrent use with antithyroid medications without medical supervision.
• Store at ambient temperature: keep in the original packaging, protect from moisture and light.

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

Major Interactions (Avoid)

• Levothyroxine: may diminish the therapeutic effect of thyroid hormone replacement.
• Antithyroid drugs (propylthiouracil, methimazole): antagonistic action reducing iodine blockade.
• Amiodarone: high iodine load can exacerbate thyroid dysfunction.

Moderate Interactions (Monitor Closely)

• ACE inhibitors: monitor serum potassium levels for potential hyperkalaemia.
• Loop diuretics: assess renal function and electrolyte balance.
• Lithium: may alter thyroid function; monitor thyroid tests regularly.