Thyroid hormones are two hormones produced and released by the thyroid gland, namely triiodothyronine (T 3) and thyroxine (T 4). They are tyrosine-based hormones that are primarily responsible for regulation of metabolism. This study is an unblinded, randomized controlled cross-over study, which involves taking 2 different forms of levothyroxine sequentially over a 16 week period. Click here for Frequently Asked Questions on Optimal Thyroid Replacement. The majority of patients with hypothyroidism are treated with thyroxine, also known as T4 (Trade names include Synthroid, Eltroxin, Levoxyl etc). The thyroid, a tiny, butterfly-shaped gland located at the base of the front of your neck, has an enormous impact on your overall health. It affects the function of every organ in your body and if it is not working properly, it can send your body out of sync. Thyro-Tabs (L-Thyroxine) is a fast-acting medication that treats the symptoms of hypothyroidism in dogs; in certain cases, it can be used for cats. I was taking Synthroid then my insurance decided that they wouldn't cover that drug anymore (only generic) unless the doctor did a lot of paperwork and showed that it was medically necessary. Levothyroxine is a synthetic form of the thyroid hormone thyroxine (T4) that's used to treat an underactive thyroid, known as hypothyroidism. It's the most commonly prescribed medication in the United States, with around 123 million prescriptions written in 2016. Levothyroxine is frequently prescribed for patients with hypothyroidism. In this lesson we will examine the dosages for different levels of severity and discuss the side effects of the medication. Osteoporosis, defined as an inappropriate decrease in bone mass, is a common disease. Osteoporosis is a silent disease. If bone pain is present, there may be associated conditions present such as osteoarthritis, or small fractures responsible for the pain. Some people find that the difference between Armour and Synthroid changes the way they feel on these treatments for hypothyroidism.