Kaliumjodidi G.L. Pharma (Potassium Iodide)

Kaliumjodidi G.L. Pharma is a thyroid blocking agent that works by saturating the thyroid gland with stable iodine, thereby preventing radioactive iodine uptake in several emergency contexts.

• Radiation emergency exposure: provides thyroid protection by blocking uptake of radioactive iodine.
• Nuclear power plant incidents: prevents thyroid accumulation of iodine‑131 following accidental releases.
• Radioactive iodine therapy (pre‑treatment): reduces thyroid uptake when prophylaxis is required before diagnostic or therapeutic iodine procedures.

• Potassium iodide supplies a large amount of stable iodine that rapidly fills the thyroid's iodine pool. This saturation triggers the Wolff‑Chaikoff effect, temporarily inhibiting organification of iodine and thereby blocking the gland's ability to absorb additional, potentially radioactive iodine molecules.

Potassium iodide is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Nausea or mild gastrointestinal upset.
• Metallic or salty taste in the mouth.
• Headache or mild dizziness.
• Skin rash or mild itching.
• Mild vomiting.
• Transient increase in salivation.

Serious or Rare Side Effects

• Anaphylactic or severe allergic reaction.
• Iodide‑induced hyperthyroidism (Jod-Basedow phenomenon).
• Severe hypothyroidism due to prolonged Wolff‑Chaikoff effect.
• Stevens‑Johnson syndrome or toxic epidermal necrolysis.
• Acute renal impairment in susceptible patients.
• Pulmonary edema in rare cases of severe hypersensitivity.

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

• Pregnancy: consult a healthcare professional before use, as iodine can affect fetal thyroid function.
• Breastfeeding: assess risk versus benefit, as iodine may be secreted in breast milk.
• Pre‑existing thyroid disease: use under specialist supervision to avoid exacerbating hypo‑ or hyper‑thyroidism.
• Renal impairment: monitor kidney function, as reduced clearance may increase systemic exposure.
• Concomitant medications: review all current drugs for potential interactions.
• Store at ambient temperature: keep in the original packaging, protect from moisture and direct sunlight.

Potassium iodide may interact with several medicines, requiring careful management.

Major Interactions (Avoid)

• Thyroid hormone replacement therapy: potassium iodide can diminish the effectiveness of levothyroxine.
• Amiodarone: combined iodine load may exacerbate thyroid dysfunction.
• Lithium: concurrent use can increase the risk of thyroid abnormalities.

Moderate Interactions (Monitor Closely)

• ACE inhibitors or ARBs: monitor serum potassium levels for potential hyperkalaemia.
• Potassium‑sparing diuretics (e.g., spironolactone): watch for elevated potassium.
• Antithyroid drugs (e.g., methimazole): may reduce the protective effect of potassium iodide on the thyroid.