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.

For topical use such as in the case of minor wounds on the skin there are several formulations available. The main types used include ointment, gel or tincture. Commonly, these formulations are mixed with another ingredient known as povidone which serves to increase the effectiveness. The tincture is also said to be effective in emergency disinfection of water. The mechanism of action is not clear in this case.

Lugols is widely used in biochemical experiments. The most notable is the testing of starch presence in organic molecules. When a compound containing starch is placed in the presence of iodine there is a characteristic blue black reaction. This is due to the interaction of the compound with polysaccharide molecules found in starch. A similar reaction is seen with a disease known as amyloidosis.

The solution is widely used in cervical cancer screening. In this test, it is applied on the vaginal wall and on the cervix under the exposure of an instrument known as a colposcope. Since normal vaginal and cervical tissues have a high amount of glycogen, they will stain brown. Abnormal or suspicious tissues do not stain adequately and appear paler. It is the light staining areas that are used to provide biopsy specimens for histological examination.

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.

In the early years of its discovery, the solution was an important treatment of gout. With scientific advancement over the years, it has fallen out of favour. The same fate has befallen it for the treatment of hyperthyroidism in which case it had been the first line drug for a long time. The main side effect associated with it was inhibition of thyroid hormone synthesis (also known as the Wolff Chaikoff effect).

Macroalgae require elemental iodine for growth and survival. The element is also important for other coral reef inhabitants. For these reasons, it is heavily used in the maintenance of marine ecosystems. Its effects are mainly due to its ability to significantly reduce the number of harmful bacteria and parasites. The other major benefits are the prevention of coral reef bleaching and polyp expansion.

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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