TIROSINT™ (levothyroxine sodium) capsules are soft gelatin capsules to be orally administered, which contain synthetic L-3,3',5,5'-tetraiodothyronine sodium salt [levothyroxine (T4) sodium]. Synthetic T4 is identical to that produced in the human thyroid gland.
Levothyroxine sodium is used for the following indications:
Hypothyroidism - As replacement or supplemental therapy in congenital or acquired hypothyroidism of any etiology, except transient hypothyroidism during the recovery phase of subacute thyroiditis. Specific indications include: primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) hypothyroidism and subclinical hypothyroidism. Primary hypothyroidism may result from functional deficiency, primary atrophy, partial or total congenital absence of the thyroid gland, or from the effects of surgery, radiation, or drugs, with or without the presence of goiter.
Pituitary TSH Suppression - In the treatment or prevention of various types of euthyroid goiters (see WARNINGS and PRECAUTIONS), including thyroid nodules (see WARNINGS and PRECAUTIONS), subacute or chronic lymphocytic thyroiditis (Hashimoto's thyroiditis), multinodular goiter (see WARNINGS and PRECAUTIONS) and, as an adjunct to surgery and radioiodine therapy in the management of thyrotropin-dependent well-differentiated thyroid cancer.
Media Articles Related to Tirosint (Levothyroxine)
Endocrine Societies at Odds Over Advice on T3 for Hypothyroidism
Source: Medscape Diabetes & Endocrinology Headlines [2015.02.17]
The American Thyroid Association and American Association for Clinical Endocrinology may have to agree to disagree on whether or not to endorse use of triiodothyronine in hypothyroid.
Medscape Medical News
Source: MedicineNet Carpal Tunnel Syndrome Specialty [2015.02.05]
Category: Diseases and Conditions
Created: 12/31/1997 12:00:00 AM
Last Editorial Review: 2/5/2015 12:00:00 AM
Researchers gain new insights into hypothyroidism
Source: Endocrinology News From Medical News Today [2015.01.29]
Results suggest why standard treatments fail some patients and how to help themAn international research team led by physician-scientists at Rush University Medical Center has gained new insights...
Smoking while breastfeeding puts children at risk of obesity later in life
Source: Endocrinology News From Medical News Today [2015.02.05]
Children of mothers who smoke while breast feeding are more likely to develop serious health problems such as obesity, hypothyroidism, diabetes and cardiovascular disease later in life, according...
What are the health benefits of iodine?
Source: Endocrinology News From Medical News Today [2015.02.02]
Find out about the potential health benefits of consuming foods containing iodine, including preventing goiter, hypothyroidism, and mental deficiency and quadriplegia in newborns.
Published Studies Related to Tirosint (Levothyroxine)
Reduction of thyroid nodule volume by levothyroxine and iodine alone and in combination: a randomized, placebo-controlled trial. [2011.09]
CONTEXT: Nodular goiter is common worldwide, but there is still debate over the medical treatment. OBJECTIVE: The objective of the study was the measurement of the effect of a treatment with (nonsuppressive) T(4), iodine, or a combination of both compared with placebo on volume of thyroid nodules and thyroid... CONCLUSION: In a region with a sufficient iodine supply, a 1-yr therapy with a combination of I and T(4) with incomplete suppression of thyrotropin reduced thyroid nodule volume further than either component alone or placebo.
The effect of levothyroxine and selenomethionine on lymphocyte and monocyte cytokine release in women with Hashimoto's thyroiditis. [2011.07]
CONTEXT: No previous study determined monocyte- and lymphocyte-suppressing effects of levothyroxine and selenomethionine and assessed whether their coadministration is superior to treatment with only one of these drugs. OBJECTIVE: Our objective was to compare the effect of levothyroxine and selenomethionine on monocyte and lymphocyte cytokine release and systemic inflammation in patients with Hashimoto's thyroiditis... CONCLUSIONS: Despite affecting different types of inflammatory cells, levothyroxine and selenomethionine exhibit a similar systemic antiinflammatory effect in euthyroid females with Hashimoto's thyroiditis. This action, which correlates with a reduction in thyroid peroxidase antibody titers, may be associated with clinical benefits in the prevention and management of Hashimoto's thyroiditis, particularly in subjects receiving both agents.
Pharmacokinetic equivalence of a levothyroxine sodium soft capsule manufactured using the new food and drug administration potency guidelines in healthy volunteers under fasting conditions. [2011.06]
CONCLUSIONS: The levothyroxine soft capsule formulated with the stricter new potency guideline set forward by the Food and Drug Administration met equivalence criteria in terms of rate and extent of exposure under fasting conditions to the reference tablet formulation. Clinical doses of the capsule formulation can be given using any combination of the commercialized strengths.
Effect of levothyroxine treatment on in vitro fertilization and pregnancy outcome in infertile women with subclinical hypothyroidism undergoing in vitro fertilization/intracytoplasmic sperm injection. [2011.04]
OBJECTIVE: To investigate whether levothyroxine (LT4) treatment has beneficial effects on IVF results and pregnancy outcome in infertile patients with subclinical hypothyroidism undergoing IVF/intracytoplasmic sperm injection (ICSI)...
Metabolic effects of liothyronine therapy in hypothyroidism: a randomized,
double-blind, crossover trial of liothyronine versus levothyroxine. 
CONCLUSIONS: The substitution of L-T(3) for L-T(4) at equivalent doses (relative
Clinical Trials Related to Tirosint (Levothyroxine)
Generic vs. Name-Brand Levothyroxine [Recruiting]
This study compares two different brands of thyroxine (thyroid hormone). Currently,
pharmacists may be substituting generic formulations of thyroid hormone without your doctor
knowing about this. Although a small difference in thyroid function is not significant in
most healthy children, adolescents and adults, in infants and toddlers even a small
difference in thyroid function can have important harmful consequences on brain development.
The purpose of the present study is to learn whether the difference between brands of
thyroid hormone that are currently being substituted is sufficient to cause a difference in
Levothyroxine for Children With Euthyroid Sick Syndrome [Recruiting]
The purpose of this study is to determine whether levothyroxine is effective and safe in the
treatment of children with euthyroid sick syndrome, hospitalized in a pediatric intensive
Combined Levothyroxine/Liothyronine Supplementation in Hypothyroid Patients With Brain Tumors [Recruiting]
1. Assess whether combined treatment with Levothyroxine and Liothyronine improves learning
2. Explore the relationship between T3 treatment and other domains of cognitive function,
quality of life, and mood.
Levothyroxine Treatment in Thyroid Benign Nodular Goiter [Recruiting]
We will study the effect of taking eltroxin at different time, i. e. fasting or postprandial
periods. We will also study the effect of levothyroxin treatment in Chinese people
Supplemental Thyroxine Treatment for Preterm Infants With Hypothyroxinemia [Recruiting]
In order to determine the efficacy and safety of thyroxine replacement, a randomized
clinical trial of thyroxine supplementation for VLBW infant with hypothyroxinemia during the
first month of age is conducted.
Reports of Suspected Tirosint (Levothyroxine) Side Effects
Heart Rate Increased (4),
Abdominal Discomfort (3),
Feeling Abnormal (3),
Abdominal Pain (2),
Coeliac Disease (2),
Chest Pain (2), more >>
PATIENT REVIEWS / RATINGS / COMMENTS
Based on a total of 13 ratings/reviews, Tirosint has an overall score of 5.62. The effectiveness score is 5.69 and the side effect score is 7.69. The scores are on ten point scale: 10 - best, 1 - worst. Below are selected reviews: the highest, the median and the lowest rated.
Tirosint review by 52 year old female patient
|Overall rating:|| || |
|Effectiveness:|| || Highly Effective|
|Side effects:|| || No Side Effects|
|Condition / reason:|| || low thyroid|
|Dosage & duration:|| || 75 mg taken 1x day for the period of First prescribed 3/07, still take daily |
|Other conditions:|| || Occasional acid reflux|
|Other drugs taken:|| || None|
|Benefits:|| || I had experienced decreased energy and increasing tiredness for several years. It got to the point I was taking naps for the first time since I was a small child, and still didn't feel refreshed. I also felt cold frequently and had put on a good 20 pounds in a year. When I went for my annual physical, my blood work came back with high cholesterol for the first time. I thought it was advancing middle age. Fortunately, my MD put it all together and ordered a thyroid test. I was very low. Within two weeks, I felt energized and my mood improved. I have shed some (not all, darn it) of the weight and my cholesterol score is lower. |
|Side effects:|| || I had none except for a few hot flashes (well past menopause) that went away in the first few weeks. I have never been a pill-taker for fear of side effects, but this was a good experience. Fortunately, the initial dose was effective and did not need adjustment.|
|Comments:|| || As I said, my doctor spotted the symptoms and ordered a thyroid test. When it came back very low, she prescribed 75 mg a day of levothyroxine, and I felt a little better almost immediately. Within 2 weeks, I felt younger, more energy, better mood and my weight gain stopped. I have enough energy to exercize and with only a slight shift in my fairly healthy diet to less fat and more fruits and vegetables, the weight has slowly come off. I have my thyroid checked every 6 months with good results so far. Between the medication and some dietary changes, my cholesterol is down from 230 to 206. I still have about 6 pounds to get back to my starting weight. Unless there's a permanent cure out there, I won't mind taking this little lifesaver forever.|
Tirosint review by 72 year old male patient
|Overall rating:|| || |
|Effectiveness:|| || Marginally Effective|
|Side effects:|| || No Side Effects|
|Condition / reason:|| || tsh level was low no clinical symtoms|
|Dosage & duration:|| || 0.025 (dosage frequency: every morning before breakfast) for the period of 9 months|
|Other conditions:|| || none|
|Other drugs taken:|| || none|
|Benefits:|| || cold not discern because there was no clinical symptom other than tsh leel was low.the lab test result indicate improvement in tsh level but the doctor did not increase the dosage of the drug.|
|Side effects:|| || none|
|Comments:|| || every morning i took the pill with water and waited 2 hours before breakfast. no side effects were noted. no clearcut benefits either. i am a healthy senior with no physical problem other than low level of thyroid hormone.|
Tirosint review by 55 year old female patient
|Overall rating:|| || |
|Effectiveness:|| || Ineffective|
|Side effects:|| || Extremely Severe Side Effects|
|Condition / reason:|| || Hypothyroid|
|Dosage & duration:|| || 50mg taken one per day for the period of 45 days|
|Other conditions:|| || blood pressure|
|Other drugs taken:|| || diovan|
|Benefits:|| || Initially felt good, then after a week knee pain started. Week later started getting bumps on my legs. Kept thinking I was doing something else wrong, blamed it on new shoes, etc. Knees hurt, were creaking and pain got worse. Bumps were scary. |
|Side effects:|| || Severe joint pain knees, sleeplessness, vaculitis.|
|Comments:|| || Doctor said to discontinue.|
Page last updated: 2015-02-17