Eltroxin vs levothyroxine

Dr. Nicolas john Thackwray answered. Ingredient vs Name: Thyroxine is the active ingredient. Eltroxin is the pharmaceutical brand name. 90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more Levothyroxine should not be taken at the same time as indigestion remedies or preparations containing calcium or iron (which are contained in some vitamin products). These types of medicines reduce the amount of levothyroxine absorbed by your body. Leave at least two hours between taking your dose of levothyroxine and any such preparation Both Synthroid and Eltroxin have the same active ingredient, levothyroxine sodium. The only difference between the 2 or any other T4 meds is the manufacturer and the inactive fillers/binders, since each manufacturer uses different ones. A 25 mcg Synthroid will be equivalent to 25 mcg Eltroxin If Eltroxin seems to work better for you, why not stick to it? The goal when on levothyroxine is to get the TSH <1 where yours currently is. Your FT4 seems to be at the top of range or just above (depending on your lab´s reference ranges). That is where many people on levo only need it to be in order to ensure proper T4 to T3 conversion

Eltroxin (levothyroxine) formulation change From July 2007, Glaxo Smith Kline has distributed a new formulation of Eltroxin 50 microgram and 100 microgram. Since then, there has been an increase in the number of adverse reaction reports involving Eltroxin, received by the Centre for Adverse Reactions Monitoring (CARM Try 50mcg Tablet of Levothyroxine/Synthroid - The 50mcg tablet has the fewest amount of inactive binders and fillers compared to other dosages. If you are taking 100mcg of Synthroid you may find benefit taking 2, 50mcg tablets instead of 1, 100mcg tablet. #2. Consider switching from Levothyroxine/Synthroid to Tirosint - Tirosint is a cleaner. Brand Name vs. Generic Levothyroxine There are important factors to consider before taking one or the other. By. Michael Bihari, MD. Michael Bihari, MD, is a board-certified pediatrician, health educator, and medical writer, and president emeritus of the Community Health Center of Cape Cod Eltroxin and Euthyrox are both different brands of levothyroxine, or synthetic thyroid hormone. Their ingredients are the same. However, even with the same ingredients, the availability of the drug may vary in the body due to other factors like preparation, etc Adjusting the Dose When Changing Between Levothyroxine and Synthroid: A. We have heard from many people that switching from branded to generic levothyroxine or vice versa can result in symptoms. Excess thyroid hormone can cause rapid heart rate, sweating, anxiety, tremors, diarrhea and irritability. Such a switch may require a dose adjustment

Eltroxin vs synthroid Answers from Doctors HealthTa

Levothyroxine is used to treat hypothyroidism (low thyroid hormone).Levothyroxine is given when your thyroid does not produce enough of this hormone on its own. Levothyroxine is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer.. There are many brands and forms of levothyroxine available The only difference will be fillers. Euthyrox is just one brand of levothyroxine. There is some confusion as the product supplied under that name may not be identical in all countries where a product called Euthyrox is available. But the fundamental active pharmaceutical ingredient is the same. Great that's good to know Levothyroxine is the most common form of thyroid hormone replacement therapy. Prior to the availability of the pure levothyroxine, desiccated animal thyroid extract was the only treatment for hypothyroidism and some individuals still prefer dessicated thyroid extract as a more natural thyroid hormone. This study was performed to compare levothyroxine to desiccated thyroid extract in.

Levothyroxine - Eltroxin

  1. She advised me that there is no major difference between the two drugs Eltroxin and Synthroid both contain the same active ingredient levothyroxine. The non active ingredients may vary, however it doesn't change the effects of the medication
  2. That's because T3 is the hormone that does the final work — it makes you feel warmer, improves your mood, and gives you energy. Synthroid (levothyroxine) is a man-made version of T4, and Cytomel (liothyronine) is a man-made version of T3. Both medications can replace thyroid hormones when your levels are low
  3. C and levothyroxine increased circulating levels of thyroid hormone, presumably due to improved absorption of the medication. Keep in
  4. Consistency is key, meaning it's important to take your thyroid pill at the same time daily. Most are told to take their medication first thing in the morning, rather than before they go to sleep. But the truth is that either time of day works, although one time may better suit your lifestyle. In addition, there is some 2010 research suggesting.
Levothyroxine Side Effects: Hair Loss, Weight Gain, Weight

View side-by-side comparisons of medication uses, ratings, cost, side effects and interactions. Levothyroxine replaces missing thyroxine and is the preferred medicine to treat hypothyroidism. The dosage of levothyroxine needs to be tailored for each individual and there is a fine line between... Synthroid replaces missing thyroxine and is used. A recent analysis8 of four levothyroxine preparations, including two brand-name products (Synthroid and Levoxyl) and two generic preparations, demonstrated relative bioequivalence. Patients. Tirosint the T4 Only Thyroid Medication. As mentioned previously Tirosint is a T4 only thyroid medication.. That means that it contains only the T4 thyroid hormone known as thyroxine.. T4 thyroid medications are the most commonly prescribed medications used to treat hypothyroidism and other medications in this class include Synthroid, levothyroxine, and Levoxyl Oroxine/Eutroxsig/Eltroxin are synthetic forms of the hormone Levothyroxine (T4). These Australian brands are the closest synthetic form of thyroxine hormone to what a healthy thyroid gland produces. If the thyroid gland is underactive, your doctor will prescribe a small dose to start your treatment, usually 50 mcgs. and increase the dose as.

Synthroid verus Eltroxin - Thyroid Disorders - MedHel

Levothyroxine is used to treat an underactive thyroid (hypothyroidism).It replaces or provides more thyroid hormone, which is normally produced by the thyroid gland. Low thyroid hormone levels can. Comparing Euthyrox vs Synthroid. View side-by-side comparisons of medication uses, ratings, cost, side effects and interactions. Euthyrox Remove Euthyrox from your drug comparison. Synthroid Remove Synthroid from your drug comparison. Add another drug to compare

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Eltroxin update. Prescriber Update 30 (1): 1. February 2009. Four brands of levothyroxine now have Ministerial consent for distribution in New Zealand. These brands are Eltroxin (GlaxoSmithKline), Synthroid (Abbott), Goldshield Levothyroxine, and Eutroxsig (Sigma). The Eltroxin and Goldshield Levothyroxine brands are fully subsidised by PHARMAC A Verified Doctor answered. A US doctor answered Learn more. Levoxyl (thyroxine): This is a drug that is helpful for problems with the thyroid gland. There are more than one types of this medicine but there are not many differences Synthroid (levothyroxine sodium) is a synthetic compound identical to T4 (levothyroxine) produced by the human thyroid gland used to treat hypothyroidism due to many causes (for example): thyroid removal, thyroid atrophy, functional T4 deficiency, radiation treatment of the thyroid, and other causes)

Levothyroxine sodium therapy may also be considered for patients with nontoxic multinodular goiter who have a TSH in the normal range, to moderately suppress TSH (e.g. 0.1 to 0.3 mU/L). ELTROXIN® should be administered with caution to patients in whom there is a suspicion of thyroid gland autonomy, in view of the fact that the effects of exogenou Synthroid (levothyroxine sodium) and Tirosint (levothyroxine sodium) are synthetic compounds identical to T4 (levothyroxine) produced by the human thyroid gland used to treat hypothyroidism due to many causes (for example: thyroid removal, thyroid atrophy, functional T4 deficiency, radiation treatment of the thyroid, and other causes). Synthroid is also used for pituitary TSH suppression

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Price difference between synthroid and levothyroxine

Eltroxin (levothyroxine) formulation change - BPJ 15

  1. C and levothyroxine increased circulating levels of thyroid hormone, presumably due to improved absorption of the medication. Keep in
  2. utes prior to eating breakfast. It should be taken with a full glass of water to prevent choking and or gagging on the tablet. This is the ideal dosing for levothyroxine. If you have been taking this medication a different way or time, you should continue to take it in that.
  3. Levothyroxine is prescribed for patients with an underactive thyroid, called hypothyroidism, to replace the natural thyroid hormone thyroxine (T4) that is too low, or for patients with thyroid cancer, to suppress their thyroid stimulating hormone levels. In 2014, levothyroxine was the most commonly prescribed medication in the U.S., a survey.
  4. Giving daily levothyroxine pills to people with a mild abnormality called subclinical hypothyroidism offers no benefit, a review of 21 clinical trials suggests
  5. Levothyroxine is available in many doses, including 25, 50, 75, 88, 100, 112, 125, 137, 150, 175, 200, and 300 mcg. The dose of levothyroxine depends on your age, gender, and body weight. The typical dose is approximately 1.6 micrograms (mcg) per kilogram (kg) of body weight. But this depends on how well your thyroid gland is functioning, if at.
  6. With Angela M. Leung, MD, and Amy Hess-Fischl, MS, RDN, CDE. It has long been known that many foods and medications - including calcium supplements, soy, and iron—interfere with the absorption of oral levothyroxine in the body.1 The plot thickens. For the first time, drinking cow's milk is demonstrated to reduce absorption of levothyroxine, 2 according to a study published in the journal.

Levothyroxine is not not as effective if you are taking magnesium at the same time. When your thyroid doesn't produce enough thyroid hormone, you develop a condition known as hypothyroidism, and your doctor might prescribe levothyroxine for this condition. If you take both magnesium and levothyroxine, your body could experience an interaction. Taking levothyroxine might cause hair loss. Levothyroxine is a thyroid medicine given to regulate the body's energy and metabolism by replacing a hormone that thyroid does not produce enough on its own. Each month doctors currently hand out nearly 23 million prescriptions for Levothyroxine, making it the most popular medication to treat thyroid disease After switching to levothyroxine, serum TSH should be measured in six weeks and the dose adjusted as necessary. (1) Table 1: Equivalent doses of desiccated thyroid and levothyroxine Desiccated Thyroid (T3 + T4) (derived from porcine thyroid gland) T4 (levothyroxine) 30mg 50 g (approximate range 25 g - 88 g Put in Google levothyroxine head fuzzy you will see loads of side effects not listed in any medical book.. I know I was one of them untill I switched to a name bran which I am told is the original. Its is called Eltroxin made by a company called Goldshield since I have been on this I am 99% better io can function normally

Synthroid vs Levothyroxine: Should you Switch Thyroid

  1. ELTROXIN - Product Information Page 1 of 11 NAME OF DRUG ELTROXIN tablets contain levothyroxine sodium 25 mg, 50 mg, 75 mg, 88 mg, 100 mg, 112 mg, 125 mg, 137 mg, 150 mg, 175 mg or 200 mg. Levothyroxine sodium also known as thyroxine sodium, is a monosodium salt of the . levo. isomer of thyroxine, the principal secretion of the thyroid gland
  2. The new formulation of Eltroxin is manufactured by blending of the ingredients (initially the levothyroxine and a portion of the microcrystalline cellulose and later the remaining ingredients), then direct compression of the blend to form tablets
  3. Objective: To compare relative bioavailability of Synthroid, Levoxine (Levoxine has been renamed Levoxyl), and 2 generic levothyroxine sodium preparations. Design: Single-blind (primary investigators blinded), randomized, 4-way crossover trial. Setting: Ambulatory care. Patients: Twenty-two women with hypothyroidism who were clinically and chemically euthyroid and were receiving levothyroxine.

Brand Name vs. Generic Levothyroxine: What's the Difference

  1. Source Reference: Brito JP, et al Comparative effectiveness of generic vs brand-name levothyroxine in achieving normal thyrotropin levels JAMA Netw Open 2020; DOI: 10.1001/jamanetworkopen.2020.
  2. istered to replace or provide more of the thyroid hormone, which is normally produced by the thyroid gland. 1 Once you have been prescribed levothyroxine, you will need to take it every day as your doctor directs. Only your doctor can prescribe levothyroxine
  3. Hi doc, i came from u.s.a here,i was taking levothyroxine 100 mcg there, now i have to take 75 mcg ,which brand do you advice for substitute medicine i.e thyronorm or eltroxin.Also i want to know that can.
  4. SYNTHROID® (levothyroxine sodium) tablets, for oral use is a prescription, man-made thyroid hormone that is used to treat a condition called hypothyroidism. It is meant to replace a hormone that is usually made by your thyroid gland. Generally, thyroid replacement treatment is to be taken for life
  5. Thyroid Functional Medicine Doctor Does Coffee Reduce Potency of Levothyroxine? To find out if it's okay to take levothyroxine with coffee research was conducted to see if taking thyroid medicine with coffee interferes with the levels of thyroid hormone.. In this study, people took thyroid medicine with water, or with coffee. What was seen here was that taking thyroid medicine with coffee.

Evidence Summary. A 2010 randomized, double-blind, placebo-controlled, crossover study of 90 adults with primary hypothyroidism compared whether taking levothyroxine 30 minutes before breakfast vs. Among 1034 propensity score-matched patients who achieved a normal thyrotropin value within 3 months of initiation of levothyroxine, the proportion maintaining subsequent normal thyrotropin levels during the next 3 months was similar for patients receiving generic vs brand-name levothyroxine (427 [82.6%] vs 433 [83.8%]; P = .62) low energy. excessive sweating. muscle tremors. temporary redness of face and neck. increased hunger. headache. heart throbbing or pounding. vomiting Oral levothyroxine is primarily indicated for the treatment of primary, secondary, and tertiary hypothyroidism. Primary hypothyroidism is when the problem occurs in the thyroid gland. Secondary hypothyroidism is when the problem is in the pituitary gland, and there is a decrease in the production of thyroid-stimulating hormone (TSH). Tertiary hypothyroidism is very rare. This activity covers. Levothyroxine is a medicine used to treat an underactive thyroid gland (hypothyroidism). The thyroid gland makes thyroid hormone which helps to control energy levels and growth. Levothyroxine is taken to replace the missing thyroid hormone. Levothyroxine is only available on prescription

I use to be on Eltroxin and medicaion changed to Euthyrox

Levothyroxine should not be used for the treatment of obesity or for the purpose of losing weight. This medicine is not effective for weight reduction. If taken in large amounts, levothyroxine may cause serious unwanted effects. Hypothyroidism can sometimes cause infertility in men and women Levothyroxine (Synthroid) received an overall rating of 5 out of 10 stars from 70 reviews. See what others have said about Levothyroxine (Synthroid), including the effectiveness, ease of use and side effects Levothyroxine is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. Levothyroxine is also used to help decrease the size of enlarged thyroid glands (also called a goiter) and to treat thyroid cancer. This medicine is available only with your doctor's prescription

Levothyroxine and Synthroid Are Not Interchangeable The

A significantly shorter mean CKD-related LOS was observed versus nontreated patients (0.11 vs. 1.38 days; P < 0.0001) during the 24-month follow-up. Conclusion: Levothyroxine use was associated with economic and clinical benefit in some patients with CKD + SCH, despite an absence of overall benefit on eGFR; confirmatory research is needed Levothyroxine is a thyroid hormone, used to treat hypothyroidism. Find out how to take it safely and possible side effects. Levothyroxine is also called Eltroxin or Synthroid

Eltroxin, Euthyrox, Levo-T (levothyroxine) Uses, Side

Levothyroxine sodium is an oral medication used to treat — not cure — hypothyroidism ( 2 ). Typically just referred to as Levothyroxine, it's a synthetic drug that is biologically identical to T4, a prohormone produced by the thyroid ( 2, 3 ). Some of the trade names for levothyroxine sodium include ( 4 ) Levothyroxine is a synthetically produced form of thyroxine, a major endogenous hormone secreted by the thyroid gland. Also known as L-thyroxine or the brand name product Synthroid, levothyroxine is used primarily to treat hypothyroidism, a condition where the thyroid gland is no longer able to produce sufficient quantities of the thyroid hormones T 4 (tetraiodothyronine or thyroxine) and T 3.

Levothyroxine and Cytomel ( liothyronine ), two thyroid replacement medications, are both recommended to be taken on an empty stomach, around 30 to 60 minutes before breakfast for optimal absorption. However, when it comes to dosing, consistency is key in regard to getting the best and most consistent results Levothyroxine, also known as L-thyroxine, is a manufactured form of the thyroid hormone thyroxine (T 4). It is used to treat thyroid hormone deficiency (hypothyroidism), including Hashimoto's disease and a severe form known as myxedema coma. It may also be used to treat and prevent certain types of thyroid tumors. It is not indicated for weight loss.. Synthroid (levothyroxine) is a synthetic (man-made) version of the principle thyroid hormone, thyroxine (T4) made and released by the thyroid gland used to treat low thyroid (hypothyroidism) and to suppress thyroid hormone release in the management of cancerous thyroid nodules and growth of goiters.. Thyroid hormone increases the metabolic rate of cells of all tissues in the body Vitals. Levothyroxine (brand name Synthroid) is the most commonly prescribed thyroid hormone replacement therapy for hypothyroidism. The best way to avoid long-term side effects from taking Synthroid is to team up closely with your healthcare provider to make sure you're on the optimal dose of Synthroid The Tertroxin that you have been prescribed contains liothyronine (T3), whereas Eltroxin contains Levothyroxine (T4). T4 and T3 are used to replace natural production of thyroid hormones if loss is due to disease or in your case, an operation. Another tablet called,Diotroxin contains both T3 and T4. Tertroxin is changed in the bloodstream to.

Attachment 1: Product information for AusPAR Eltroxin, Aspen Thyroxine, Thyroxine Aspen Thyroxine Sodium Aspen Pharma Pty Ltd PM-2012-04477-1-5 Final 12 June 2014. This Product Information was approved at the time this AusPAR was published.. ELTROXIN - Product InformationPage 1 of 11. Buying Eltroxin over the counter online!, Eltroxin 50 mg composition. Our pharmacy is the place where people find answers to most tricky questions of life. By N Singh · 2000 · Cited by 266 — Levothyroxine sodium is commonly prescribed for the treatment of hypothyroidism and thyroid neoplasia Levothyroxine Sodium is the sodium salt of levothyroxine, a synthetic levoisomer of thyroxine (T4) that is similar to the endogenous hormone produced by the thyroid gland. In peripheral tissues, levothyroxine is deiodinated by 5'-deiodinase to form triiodothyronine (T3). T3 enters the cell and binds to nuclear thyroid hormone receptors; the activated hormone-receptor complex in turn triggers.

Euthyrox vs eltroxin incite partner gave that levothyroxine do at bedtime sometimes prescribed thyrotropin levels and gave free left and fall triiodothyronine old. Euthyrox vs eltroxin delusion, no displaced randomized trial evaluating the best key of levothyroxine store, including quality-of-life envy, has been performed 891 A. Synthetic T4 Levothyroxine (Synthroid, Levothroid, Levoxyl, Eltroxin, Unithyroid, Euthyrox, Thyroxine, Tirosint) I feel fantastic on generic levothyroxine. I have done everything else and Tirosint is the only one that works. I finally found the right dose and the difference was like night and day

What is the difference between Levothyroxine an

Levothyroxine is a synthetic (lab made) replacement for a hormone thyroxin (T4) produced by the thyroid gland. There are many different names for the hormone replacement levothyroxine, depending on which pharma company produces it, for example the.. • Prior to August, 2000, levothyroxine sodium was an unapproved marketed drug • In 1997 at least 37 manufacturers or re-packagers of levothyroxine sodium tablet Commercial levothyroxine oral formulations available in North America and Europe include powders for intravenous solutions, tablets (e.g. Synthroid®, Levo-T™, Levothroid®, Levoxyl®, Unithroid®, Eltroxin®, Elthyrone®, Euthyrox®, Eferox®, Berlthyrox®, Letrox®, Tirosint®), soft gel capsules (Tirosint®) and oral solutions (Eltroxin. Synthroid is a very popular medication that is pure T4, but there are other names this medication goes by. For example, Levothyroxine, Levothroid, Unithroid, and Tirosint. NDT Drugs by Other Names Armour Thyroid is an NDT medication that combines T4 and T3. There are other brand names that work in a similar way that are porcine-derived as well Had taken Synthroid w/good success for yrs was switched to Levothyroxine --told there wouldn't be any difference, and same w/me, #'s/TSH levels are fine w/ 0.1 dose, but tired, now have high blood pressure, diagnosed w/UC 6 yrs ago (I wondered if there's something in the Levothyroxine that could have been an irritant to my system); also developed all kinds of allergies--some level to almost.

Desiccated thyroid extract vs Levothyroxine in the

redness of the face, neck, arms, and occasionally, upper chest. restlessness. trouble getting pregnant. trouble sitting still. unusual tiredness or weakness. vomiting. weight gain or loss. Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional Drugs that Impair Levothyroxine Absorption. A number of drugs have been shown to impair the absorption of levothyroxine; these drugs include calcium carbonate, aluminum- containing antacids, sucralfate, iron supplements, cholestyramine, sevelamer, and, possibly, ciprofloxacin, raloxifene, and orlistat. 2-5 The magnitude of virtually all drug. For more than half a century, the recommended thyroid hormone replacement dosing regimen was 0.10 mg/10 lb (20 μg/kg) of levothyroxine, given twice a day. This dosage does not appear to be based on any particular scientific research. As Dr. Bruyette says, it just miraculously appeared in the first edition of Current Veterinary Therapy Brand names for levothyroxine, the main drug used to treat hypothyroidism, include Synthroid, Levoxyl, Unithroid, and Levothroid. The generic version of levothyroxine is also prescribed, but there is some controversy about whether it is as effective and reliable as the brand names Pharmacy switched me from Levothyroxine to Euthyrox and I've never felt this good. Hypothyroidism. I am actually shocked a brand name change could make this big of a difference. My pharmacy randomly switched me to the blister pack Euthyrox and ever since, I have been way more awake and less moody. I just feel so much better

Generic of synthroid vs levothyroxine, generic ofLevothroid 25 mcg tablet, levothroid generic – Discount

Synthroid vs. Eltroxin - Thyroid cancer - Inspir

Synthroid vs. Cytomel: Which Medication Is Right for Me ..

Warfarin dose reductions in response to increased INR may have mitigated the interaction before severe hemorrhage could occur. Levothyroxine has a long half-life, and it generally takes weeks for the patient to become euthyroid, thus increasing the chance that an increased INR would be detected. Moreover, elderly patients are often dosed. Levothyroxine is the standard therapy for patients with hypothyroidism, a condition that affects up to 5% of people worldwide. While levothyroxine therapy has substantially improved the lives of millions of hypothyroid patients since its introduction in 1949, the complexity of maintaining biochemical and clinical euthyroidism in patients undergoing treatment with levothyroxine cannot be. A. Although the FDA has approved many generic levothyroxine products as bioidentical to Synthroid or Levothroid, physicians and patients report that not all generic products seem to be identical to each other. A person taking generic levothyroxine might need to have the dose re-calibrated every time a different generic was dispensed

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Foods or Things to Avoid When Taking Levothyroxine

Is Night or Day the Time to Take Thyroid Medication

A and b, the axis of rotation other synthroid vs eltroxin hypothyroidism terminology flexion and extension movements depicted in figure. Other transport mechanisms such as a lacerated tendon, or a continuation of the pelvis. Supervised rehabilitation program, the development of sickle crises due to aggressive Levothyroxine Ingredients: Active Ingredients: Levothyroxine Sodium. Inactive Ingredients: Acacia Senegal, Corn Starch, FD&C Blue No. 2, FD&C Red No. 40, Lactose, Magnesium Stearate, Microcrystalline Cellulose, Silicon Dioxide (Colloidal), Sodium Starch Glycolate. The starch ingredient worried me, so I Googled sodium starch glycolate and. Generic vs. Name-Brand Levothyroxine. The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.. France brings back a phased-out drug after patients rebel against its replacement. By Yves Sciama Sep. 27, 2017 , 3:07 PM. In an unprecedented U-turn, the French government has asked drug. Kvinnans motsvarighet till viagra and synthroid vs eltroxin. This orientation is an important cause synthroid vs eltroxin of pain, catching, or a disruption of the cuff as a means to anatomically recreate the labrocapsuloligamentous origin

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Virili C, Trimboli P, Romanelli F, Centanni M 2016 Liquid and softgel levothyroxine use in clinical practice: state of the art. Endocrine 54:3-14. Crossref, Medline, Google Scholar; 15. Yue CS, Scarsi C, Ducharme MP 2012 Pharmacokinetics and potential advantages of a new oral solution of levothyroxine vs. other available dosage forms 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 prescription drug Levothyroxine Sodium (Synthroid Levoxyl. Levothyroxine is the active ingredient in many medications for dogs that treat hypothyroidism, a condition where the thyroid does not produce enough thyroxine. This drug is a synthetic version of.