Please note, we cannot prescribe or recommend dosages. Here is an excerpt from the book Folk Medicine by Dr. Jarvis (full text at lugols.com):

"In 1829 a French physician named Lugol originated a solution which contains iodine in a solution of potassium iodide. It has been used steadily ever since it was originated.

When used to maintain the iodine content of the body the dose is small and is taken only on certain days of the week. When the mineral content of the body is analyzed, only a trace of iodine is found. Ten drops of iodine represent more iodine than is found in the entire body. For this reason, the dose of Lugol's solution of iodine is one or two drops (In this article Dr. Jarvis is speaking about Lugol's Solution 5%. When using Lugol's Solution 2% use 2-3 single drops to get the equivalent), depending on your body weight. If you weigh 150 pounds or less, for example, your dose to maintain the normal iodine content of the body is one drop, taken at one meal on Tuesday and Friday of each week. If you weigh more than 150 pounds, the dose should be two drops instead of one. It is useful to remember that the human body works on the minimum of anything it needs. If there should be a rise in sickness in the area where you live, it would be well to take the Lugol's solution three times a week instead of two, on Monday, Wednesday, and Friday, for the purpose of storing up reserve.

How is the drop of the solution to be taken, on the directed days? In general, medical men prescribe iodine to be taken on an empty stomach, preferably 20 minutes before food is taken. During the passing years Vermont folk medicine has worked out a different plan and it is one I like to follow. It has been referred to in another connection elsewhere in this book. To repeat, adding one teaspoonful of apple cider vinegar to a glass of water to make the water acid in reaction, holding the medicine dropper horizontal in order to get a maximum drop, one drop of the Lugol's solution is added to the mixture. The contents are stirred with a spoon and sipped through the course of the meal, as one would drink a cup of coffee or tea."

What is the iodine/iodide content per drop?

For our 2% solution: Each drop (= 1/20 ml) is approximately 1.0 mg of iodine and 2.0 mg of potassium iodide. The Iodide portion of Potassium Iodide is about 75% so that is 1.5 mg. Therefore the total Iodine plus Iodide is 1.0 + 1.5 = 2.5 mg  and 2 drops is about 5.0 mg's of iodine/iodide (2.0 mg iodine, 3.0 mg iodide).  

For our 5% solution: Each drop (= 1/20 ml) is approximately 2.5 mg of iodine and 5 mg of potassium iodide. The Iodide portion of Potassium Iodide is about 75% so that is 3.75 mg. Therefore the total Iodine plus Iodide is 2.5 + 3.75 = 6.25 mg  and 2 drops is about 12.50 mg's of iodine/iodide (5.0 mg iodine, 7.50 mg iodide).