Some Basics Regarding The Use Of Lugols Iodine Solution

By Elaine Guthrie


Iodine is available in many different forms. Since it was first prepared in1829 by a French physician, Lugols iodine solution, continues to play a major role in scientific research and everyday use. The solution is prepared by dissolving elemental iodine and the compound potassium iodide in water. It is diluted to various concentrations depending on the intended use. It is also known as iodine potassium iodide Markodine or Strong solution.

The compound is available in an over the counter form as an ointment, tincture or gel. This form is used as a disinfectant especially when dealing with minor injuries to the skin. When applied topically, it is commonly it is mixed with povidone to increase its effectiveness. The tincture is also known to be useful in emergency disinfection of water. The mechanism of action of the compound in this case is not clear.

Lugols has a characteristic reaction in the presence of starch which is widely available in many organic compounds. When it interacts with the polysaccharides that make up starch molecules there is a blue black colour change and this is considered a positive reaction. For this reason, the solution is used in a number of biochemical experiments. The same reaction is seen when testing for a condition known as amyloidosis in living cells.

The compound is important in management of some types of cancers particularly cervical cancer. In this test, the solution is used to stain the entire cervix and part of the upper vagina. Normal tissues take the whole stain and appear dark brown when examined under a colposcope. The abnormal tissues do not stain entirely and appear paler. The pathologist selects these areas for taking of biopsies.

Patients suffering from Graves disease, a severe form of hyperthyroidism, may benefit from a small dose of the compound when undergoing surgery. It has been suggested by some experts that the compound may reduce blood loss associated with thyroidectomy. This effect is not seen in patients that have euthyroid hormone levels or in those on antithyroid medication.

For many years, Lugols was used in the treatment of gout. With the advent of newer and more effective therapies, it is no longer used as commonly. In the treatment of hyperthyroidism it was considered a first line therapy but has been dropped over time due to the side effect of inhibiting thyroid hormone effect (also known as Wolff Chaikoff effect). This often leads to hypothyroidism.

The element iodine is required for the growth of macroalgae and coral reef inhabitants. As a result, it is widely used in the marine aquarium industry. The role of the solution is thought to be in the removal of unwanted parasites and bacteria. Other benefits include enhancement of polyp expansion and the prevention of coral bleaching in the presence of increased light intensity.

Excessive amounts of lugols may cause harm to body cells to varying extents. High concentrations have been reported to cause destruction of the stomach mucosa during endoscopic examination. However, it should be noted that these are rare incidences.




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