After losing around 15 pounds in weight over the past 5 weeks or so I went for a blood test. I got my results back yesterday and they are positive for an overactive thyroid. I was on Amiodarone for approx 18 months prior to April, but my last blood test was in February. I'm guessing the Amiodarone is the cause, but I have to attend a thyroid clinic for tests. If the tests prove the cause to be the Amiodarone does anybody know if the effects are reversible? I guess I'm asking anybody who has been in the same situation, when they stopped taking Amiodarone and it leaves the system does the thyroid return to normal or is this another batch of medication I'm going to be on for the rest of my life?