Jodid Draselný (Potassium Iodide)

Potassium Iodide functions as a thyroid blocking agent and an essential iodine source, utilized in medical and public health strategies to mitigate radiation risk, correct deficiency, and prevent glandular enlargement.

• Radioactive iodine exposure: reduces thyroid uptake of radioactive iodine, thereby lowering radiation dose to the gland during nuclear incidents.
• Iodine deficiency: supplies essential iodine to support normal thyroid hormone synthesis, helping prevent deficiency‑related disorders.
• Goiter prevention: provides sufficient iodine to inhibit thyroid enlargement in populations at risk of endemic goiter.

• Potassium iodide dissociates in the gastrointestinal tract to release stable iodide ions. These ions are rapidly absorbed and accumulate in the thyroid gland, saturating the sodium‑iodide symporter. When the gland is saturated, uptake of additional radioactive iodine is competitively inhibited, limiting its incorporation into thyroid hormones. The supplied iodide also serves as a substrate for normal thyroid hormone synthesis, correcting deficiency.

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

Common Side Effects

• Metallic taste: temporary metallic sensation in the mouth.
• Nausea or vomiting: mild gastrointestinal upset after ingestion.
• Abdominal discomfort: stomach cramps or mild pain.
• Diarrhea: loose stools that resolve spontaneously.
• Headache: mild to moderate headache.
• Dry mouth: mild reduction in salivation.
• Fatigue: feeling of tiredness or low energy.

Serious or Rare Side Effects

• Allergic reaction: rash, itching, swelling, or anaphylaxis.
• Iodine‑induced hyperthyroidism: excess thyroid hormone production, especially in pre‑existing disease.
• Severe skin reactions: Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Respiratory distress: difficulty breathing indicating severe allergy.
• Kidney impairment: reduced renal function in susceptible patients.

When using potassium iodide, several precautions should be observed to ensure safety and effectiveness.

• Assess iodine status: evaluate dietary iodine intake before initiating therapy.
• Allergy screening: avoid use in individuals with known iodine or potassium iodide allergy.
• Thyroid monitoring: check thyroid function tests during prolonged or repeated administration.
• Pregnancy and lactation: use only if benefits outweigh potential risks and under medical supervision.
• Dosage verification: ensure the prescribed amount matches product labeling to prevent excess intake.
• Store at below 25°C: keep in the original container, protect from moisture and direct sunlight.

Potassium iodide can interact with several medications, affecting thyroid function or electrolyte balance.

Major Interactions (Avoid)

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

Moderate Interactions (Monitor Closely)

• Loop diuretics: can affect potassium balance when combined with potassium iodide.
• ACE inhibitors: monitor serum potassium levels to avoid hyperkalaemia.
• Antacids containing aluminum or magnesium: may reduce iodide absorption.