The symptoms of too much thyroid medication are identical to an overactive thyroid gland, a disorder called hyperthyroidism. Side effects, drug interactions, dosage, and pregnancy safety information should be reviewed prior to taking this medication. T3 is the active form of thyroid hormone that can be used directly by your cells without requiring your liver to be involved. Consult your doctor before breast-feeding. Thyroid replacement hormones are prescription drugs prescribed to treat hypothyroidism. When you take the proper dose of these medications, they are considered safe and have few side effects. Synthroid (levothyroxine) is a man-made version of the thyroid hormone, thyroxine (T4), used to treat underactive thyroid (hypothyroidism), cancerous thyroid nodules, and goiters. Side Effects. T3 Only Thyroid Medication Side Effects. Additional Information. Common side effects of … Like any medication, Synthroid can have side effects, but for most people, the drug just makes them feel awesome again, Goldfarb says. Our Armour Thyroid (thyroid tablets) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication. In most cases, if you stop taking your medication cold turkey, you will experience many negative side effects. Below is a list of common medications used to treat or reduce the symptoms of underactive thyroid. With a thyroid condition, your symptoms can be a good reflection of how well the medication is working. And because of this, it is possible to have some thyroid medication side effects from T3 only medications. But the constellation of symptoms and side effects associated with thyroid disease can make it difficult to know whether you feel better overall with or without your thyroid medication. Is it safe to stop taking thyroid medication? Thyroid hormone passes into breast milk but is unlikely to harm a nursing infant. The main risk of thyroid medicine is if you take too much of it, you can get symptoms of an overactive thyroid, like:. Fast heartbeat; Sensitivity to heat; Hunger Thyroid hormone levels may take 1 to 4 months to normalize; Mild side effects include rash, low grade fevers, and itchiness; Rare but serious side effects include a reduction in white blood … The thyroid has a big effect on your weight and … Side Effects of Stopping Thyroid Medication Abruptly (& Why it isn’t Safe) July 20, 2020 May 19, 2018 by Dr. Westin Childs. The standard thyroid hormone replacement drug used to treat hypothyroidism is levothyroxine   (brand names include Synthroid, Levoxyl, and Tirosint Other medications include a natural desiccated thyroid drug, such as Armour or Nature-throid, and liothyronine sodium (Cytomel). 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