Thyroid hormone replacements drugs (like Synthroid, Levoxyl, and Armour Thyroid, for example) generally have few side effects or risks when taken properly. But the most common risk associated with these drugs is development of hyperthyroid symptoms due to taking too much thyroid medication.
If you're overmedicated, you may experience insomnia, weight loss, anxiety, fatigue, weight loss, and other signs and symptoms of an overactive thyroid.
Learn more about overmedication and how it can be a pitfall to feeling well with a thyroid condition.