Potassium iodide
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| Trade names | SSKI, ThyroSafe, ThyroShield, others |
| AHFS/Drugs.com | Monograph |
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| ECHA InfoCard | 100.028.782 |
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| Formula | IK |
| Molar mass | 166.0028 |
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| Melting point | 681 °C (1,258 °F) |
| Boiling point | 1,330 °C (2,430 °F) |
| Solubility in water | 128 g/100 ml (0 °C) 140 g/100 mL (20 °C) 176 g/100 mL (60°C) 206 g/100 mL (100°C) mg/mL (20 °C) |
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Potassium iodide is a chemical compound, medication, and dietary supplement. As a medication it is used to treat hyperthyroidism, in radiation emergencies, and to protect the thyroid gland when certain types of radiopharmaceuticals are used. In the developing world it is also used to treat skin sporotrichosis and phycomycosis. As a supplement it is used in those who have low intake of iodine in the diet. It is given by mouth.
Common side effects include vomiting, diarrhea, abdominal pain, rash, and swelling of the salivary glands. Other side effects include allergic reactions, headache, goitre, and depression. While use during pregnancy may harm the baby this use is still recommended in radiation emergencies. Potassium iodide has the chemical formula KI. Commercially it is made by mixing potassium hydroxide with iodine.
Potassium iodide has been used medically since at least 1820. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. Potassium iodide is available as a generic medication and over the counter. In the United States a course of treatment is less than 25 USD. Potassium iodide is also used for the iodization of salt.
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