One tablet of Iodoral is 12.5 MG of Iodine (same as 2 drops of Lugol's). That might be too much, if you have not built up to it.
Iodine is mucolytic (breaks down mucous} so you may experience a runny nose, increased salivation or sinus headaches. Iodine is also anti-parasitic and anti-microbial in action and so signs of detoxification or “die-off” may result. This is the well known Herxheimer reaction. If there is a long-standing Iodine deficiency, you may experience hyperthyroidism for a while or have a sore throat with a slight thyroid swelling. After a week or two, this should settle down; but it is best to start with smaller dosage and build up.