Treatment with Cordarone Tablets should be started in hospital to monitor your condition. Previous next Report Problems to the Food and Drug Administration You are encouraged to report negative side effects of prescription drugs to the FDA. Because of the slow elimination of Cordarone and its metabolites, high plasma iodide levels, altered thyroid function, and abnormal thyroid-function tests may persist for several weeks or even months following Cordarone withdrawal. Since arrhythmia breakthroughs may accompany Cordarone-induced hyperthyroidism, aggressive medical treatment is indicated, including, if possible, dose hvor du kan kjope cordarone reduction or withdrawal of Cordarone. Before using amiodarone, report all medications you are currently using to your doctor or pharmacist.