Learn more about Levothyroxine Sodium Synthroid, Levoxyl, Levothroid, Unithroid, Tirosint, Levo-T, including a description, generic and brand names, drug class and mechanism, preparations, storage, reasons for prescription, dosing, drug interactions, effect on pregnancy and nursing mothers, and common side effects. Read more about the. Synthroid is a name brand drug derived from Levothyroxine Sodium. Synthroid, Levothroid, Levoxyl, and Unithroid are all name brand products derived from this drug. Generic Levothyroxine is made by many companies, and the fillers and acive ingrediant can vary quite a bit. In the U.S., generics are allowed to have from 75% to 125% of the active drug and still be within drug manufacturing guidelines. L-thyroxine, also known as levothyroxine sodium, is a prescription medication used for certain thyroid conditions. L-thyroxine is sold under the brand names of Levothroid, Lev … oxyl, Synthroid. Levothyroxine is a thyroid medicine that replaces a hormone normally produced by your thyroid gland to regulate the body's energy and metabolism. Synthroid (levothyroxine sodium) and Levothroid (levothyroxine sodium) are replacements for hormones produced by the human thyroid gland used to treat hypothyroidism (low thyroid hormone). Synthroid is also used for pituitary TSH suppression. Levothroid is also used to treat or prevent goiter Pretty much nothing! The word anhydrous means without water. If you took a teaspoon of anhydrous levothyroxine sodium and put it on a saucer, then in a fairly short time (hours or days) it would grab some water from the air and turn into levothyroxine sodium pentahydrate. Levothyroxine T4 - Synthroid , Unithroid, Levoxyl and Levothroid thyroid hormone medications are not a chemical meant to trick our system in any way. It is not toxic like other medications since it is made the same as our naturally occurring thyroid hormone. Levothyroxine is contraindicated in people with hypersensitivity to levothyroxine sodium or any component of the formulation, people with acute myocardial infarction, and people with thyrotoxicosis of any etiology. Levothyroxine is a replacement for a hormone normally produced by your thyroid gland to regulate the body's energy and metabolism. Levothyroxine is given when the thyroid does not produce enough of this hormone on its own. All Synthroid is levothyroxine sodium, but not all levothyroxine sodium is Synthroid. There are several brands of levothyroxine sodium. Synthroid and Levoxyl are the 2 main ones.