LEVOTHYROXINE SODIUM .075 mg Tablet, 90-count
Other active recalls for Levothyroxine Sodium (different manufacturers) — 6 · tap to view
🆔 Identity & classification
Where does this data come from?
🏷️ RxNorm drug class
This medicine belongs to the l-Thyroxine class.
Where does this data come from?
🏭 Manufacturer & labeler
Where does this data come from?
🩺 Clinical
- Your thyroid gland isn't making enough of a hormone called T4, which your whole body depends on to regulate your energy, metabolism, heart rate, and more. Levothyroxine is a precis...
- What exactly is levothyroxine doing for me — why do I need to take it every day?
- Timing really does make a difference with this medication. Food — especially high-fiber foods or anything soy-based — can block your gut from absorbing it properly. Taking it 30 to...
- Why does it matter so much when I take it — can't I just take it with breakfast?
Patient education
Supplement & herbal interactions
Some supplements/herbs that may interact with Levothyroxine Sodium — tap one for details:
Where does this data come from?
Ask a licensed pharmacist directly — free, answered by our team.
💊 What it looks like
Where does this data come from?
🧪 Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
-
UNII M28OL1HH48
Croscarmellose sodium is a plant-based substance derived from cellulose. It acts as a disintegrant, helping tablets and capsules break down quickly in the digestive system so the medicine can be absorbed.
-
UNII L06K8R7DQK
A synthetic blue dye approved by the FDA for use in medications and foods. It serves as a colorant to make pills and liquids visually distinct and easier to identify.
-
UNII WZB9127XOA
A synthetic red dye used to color medications and make them easier to identify. It serves as a colorant in tablets, capsules, and liquid formulations.
-
UNII 70097M6I30
Magnesium stearate is a salt made from magnesium and stearic acid, a fatty substance. It's used in tablets and capsules as a lubricant and glidant to help ingredients flow smoothly during manufacturing and prevent sticking.
-
UNII 3OWL53L36A
A natural sugar alcohol derived from seaweed or synthesized in the lab. It's used as a filler to add bulk, a sweetener in sugar-free formulas, and a disintegrant to help tablets break apart in the stomach.
-
UNII 8MDF5V39QO
A white powder form of baking soda that acts as a buffer and pH regulator in medicines. It helps maintain the right acid-base balance and may aid tablet disintegration.
-
UNII O8232NY3SJ
A plant-based carbohydrate derived from corn kernels. It acts as a filler to add bulk, a binder to hold ingredients together, and a disintegrant to help the tablet break apart in your stomach for absorption.
7 inactive ingredients listed in the exact product block matched to this NDC.
Where does this data come from?
ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
Are inactive ingredients the same for every manufacturer?
Why might an inactive ingredient be missing?
Can inactive ingredients matter?
💲 Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per each | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | Not in the retail survey — common for institutional, discontinued, or low-volume packs. | |
| Medicaid paysCMS SDUD · 12 mo | No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data. | |
| Medicare drug plans payPart D · Q2 2026 | $0.1283 | $11.55 / 90 tablets |
Where does this data come from?
🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Levothyroxine Sodium 75 ug 00378-1805-10 | Mylan | 1000 tablets | $0.046 | AB1,AB2,AB3,AB4 | Availability likely | — |
| Levothyroxine Sodium 75 ug 00527-3282-43 | Lannett | 1000 tablets | $0.046 | AB1,AB2,AB3 | Availability likely | — |
| Levothyroxine Sodium .075 mg 00904-6951-61 | Major | 100 tablets | $0.046 | AB1,AB2,AB3 | Availability likely | — |
| Levothyroxine sodium 75 ug 16729-0449-15 | Accord | 90 tablets | $0.046 | AB1,AB2,AB3,AB4 | Availability likely | — |
| Levothyroxine Sodium 75 ug 33342-0395-10 | Macleods | 90 tablets | $0.046 | AB1,AB2,AB3,AB4 | Availability likely | — |
| levothyroxine sodium 75 ug 47781-0646-10 | Alvogen, | 1000 tablets | $0.046 | AB1,AB2,AB3,AB4 | Availability likely | — |
| Levothyroxine Sodium 75 ug 51079-0441-20 | Mylan | 100 tablets | $0.046 | AB1,AB2,AB3,AB4 | Availability likely | — |
| Levothyroxine Sodium .075 mg 60687-0475-01 | American | 100 tablets | $0.046 | AB1,AB2,AB3 | Availability likely | — |
| Levothyroxine Sodium .075 mg 68180-0967-01 | Lupin | 100 tablets | $0.046 | AB1,AB2,AB3 | Availability likely | — |
| Levothyroxine Sodium .075 mg 69238-1832-01 | Amneal | 100 tablets | $0.046 | AB1,AB2,AB3 | Availability likely | — |
| Levothyroxine Sodium 75 ug 72603-0662-01 | NorthStar | 1000 tablets | $0.046 | AB1,AB2,AB3,AB4 | Availability likely | — |
| Euthyrox 75 ug 72305-0075-30 | Provell | 30 tablets | $0.222 | — | FDA listed | — |
| Levoxyl 75 ug 60793-0852-01 | Pfizer | 100 tablets | $0.944 | AB1,AB3 | Availability likely | — |
| Synthroid 75 ug 00074-5182-11 | AbbVie | 100 tablets | $1.662 | AB1,AB2 | Availability likely | — |
| Unithroid 75 ug 60846-0803-01 | Amneal | 100 tablets | $4.195 | AB1,AB2,AB3 | Availability likely | — |
| Levothyroxine sodium 75 ug 00480-8690-01 | Teva | 100 tablets | — | AB1,AB2,AB3,AB4 | Discontinued | — |
| Levothyroxine Sodium .075 mg 00615-8597-05 | NCS | 15 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium .075 mg 31722-0286-01 | Camber | 100 tablets | — | AB4 | FDA listed | — |
| Levothyroxine sodium 75 ug 50090-6118-00 | A-S | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine sodium 75 ug 50090-6119-00 | A-S | 90 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium .075 mg 50090-6824-00 | A-S | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium .075 mg 50090-6825-00 | A-S | 90 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium 75 ug 51655-0576-52 | Northwind | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium .075 mg 51655-0687-52 | Northwind | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium .075 mg 51655-0989-52 | Northwind | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium .075 mg 55154-3560-00 | Cardinal | 10 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium 75 ug 55154-5395-00 | Cardinal | 10 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium .075 mg 67046-0801-03 | Coupler | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium 75 ug 67046-1635-03 | Coupler | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine sodium 75 ug 67296-2046-03 | Redpharm | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium 75 ug 68071-3887-03 | NuCare | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| levothyroxine sodium 75 ug 68071-5227-09 | NuCare | 90 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| levothyroxine sodium 75 ug 68788-7725-03 | Preferred | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine sodium 75 ug 68788-7954-03 | Preferred | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium 75 ug 68788-8806-03 | Preferred | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium .075 mg 68788-8896-03 | Preferred | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine sodium 75 ug 70518-3274-00 | REMEDYREPACK | 90 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium 75 ug 70518-4435-00 | REMEDYREPACK | 90 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| levothyroxine sodium 75 ug 71205-0353-30 | Proficient | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium 75 ug 71205-0655-30 | Proficient | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| levothyroxine sodium 75 ug 71335-1423-01 | Bryant | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine sodium 75 ug 71335-1827-01 | Bryant | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium 75 ug 71335-2039-01 | Bryant | 30 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium 75 ug 71335-2289-01 | Bryant | 1000 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| levothyroxine sodium 75 ug 71335-2967-01 | Bryant | 90 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| levothyroxine sodium 75 ug 72162-1460-00 | Bryant | 1000 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium 75 ug 72189-0073-90 | DIRECT | 90 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium .075 mgthis 72189-0107-90 | DIRECT | 90 tablets | — | AB1,AB2,AB3 | FDA listed | — |
| Levothyroxine Sodium .075 mg 72865-0238-10 | XLCare | 1000 tablets | — | AB4 | FDA listed | — |
| Levothyroxine sodium 75 ug 82804-0053-30 | Proficient | 30 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine sodium 75 ug 87063-0085-00 | ASCLEMED | 1000 tablets | — | AB1,AB2,AB3,AB4 | FDA listed | — |
| Levothyroxine Sodium .075 mg 68071-5316-09 | NuCare | 90 tablets | — | AB1,AB2,AB3 | FDA listed | — |
Where does this data come from?
⏳ Availability & generic status
This product is an FDA-approved generic. Other versions of the same drug are listed under Therapeutic equivalents, least expensive first.
Where does this data come from?
📊 Medicare Part D spend CMS · PART D · 2026 (Q1)
🔬 Reported adverse events (FAERS)
Top reported reactions
Age at onset
Reporter sex
Serious outcomes
Where does this data come from?
📦 Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Status |
|---|---|---|---|
| 72189-0107-30 | 30 TABLET in 1 BOTTLE (72189-107-30) | 2020-05-18 | Active |
| 72189-0107-90 You're viewing this | 90 TABLET in 1 BOTTLE (72189-107-90) | 2020-05-18 | Active |
You're viewing the largest of 2 pack sizes for this product.
Pack size FAQ
What quantity is in NDC 72189-0107-90?
What is the difference between NDC 72189-0107-90 and NDC 72189-0107-30?
What NDC number is used to bill for this package of LEVOTHYROXINE SODIUM .075 mg Tablet?
🧭 About this NDC listing & data coverage
What data is (and isn’t) available for this NDC — tap to expand
| NDC identity (package / product / labeler codes) | ✓ Available |
| Labeler | ✓ Available |
| Product & package description | ✓ Available |
| Marketing category & status | ✓ Available |
| Active ingredient / dosage form / route | ✓ Available |
| FDA label (SPL via DailyMed) | ✓ Available |
| Package photos | — Not published for this NDC No photo available yet for this listing. |
| Inactive ingredients (structured) | ✓ Available |
| NADAC pharmacy acquisition price (CMS) | — Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey. |
| Orange Book / therapeutic-equivalence data | ✓ Available |
| HCPCS J-code billing crosswalk | — Not published for this NDC Most self-administered / retail products have no J-code — that is normal. |
| Medicaid utilization (CMS SDUD) | — Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold. |
Questions about this listing
Why is there no price listed?
Is the NDC printed on the package the same as the 11-digit billing NDC?
What do the three segments of this NDC mean?
Is this package still being marketed?
Does this product come in other package sizes?
Who lists this product with the FDA?
Do I need a prescription for this product?
Where does this data come from?
📄 Full prescribing information FDA SPL
🚨 Boxed Warning ▾
WARNING: NOT FOR TREATMENT OF OBESITY OR FOR WEIGHT LOSS Thyroid hormones, including levothyroxine sodium tablets, either alone or with other therapeutic agents, should not be used for the treatment of obesity or for weight loss. In euthyroid patients, doses within the range of daily hormonal requirements are ineffective for weight reduction. Larger doses may produce serious or even life threatening manifestations of toxicity, particularly when given in association with sympathomimetic amines such as those used for their anorectic effects [see Adverse Reactions (6), Drug Interactions (7.7), and Overdosage (10)].
🎯 Indications and Usage ▾
Hypothyroidism Levothyroxine sodium tablets are indicated as a replacement therapy in primary (thyroidal), secondary (pituitary), and tertiary (hypothalamic) congenital or acquired hypothyroidism. Pituitary Thyrotropin (Thyroid-Stimulating Hormone, TSH) Suppression Levothyroxine sodium tablets are indicated as an adjunct to surgery and radioiodine therapy in the management of thyrotropin-dependent well-differentiated thyroid cancer. Limitations of Use: Levothyroxine sodium tablets are not indicated for suppression of benign thyroid nodules and nontoxic diffuse goiter in iodine-sufficient patients as there are no clinical benefits and overtreatment with levothyroxine sodium tablets may induce hyperthyroidism [see Warnings and Precautions (5.4)] .
Levothyroxine sodium tablets are not indicated for treatment of hypothyroidism during the recovery phase of subacute thyroiditis.
⏱️ Dosage and Administration ▾
2.1General Administration Information Administer levothyroxine sodium tablets as a single daily dose, on an empty stomach, one-half to one hour before breakfast. Administer levothyroxine sodium tablets at least 4 hours before or after drugs known to interfere with levothyroxine sodium tablets absorption [see Drug Interactions (7.1)]. Evaluate the need for dose adjustments when regularly administering within one hour of certain foods that may affect levothyroxine sodium tablets absorption [see Drug Interactions (7.9) and Clinical Pharmacology (12.3)].
Administer levothyroxine sodium tablets to infants and children who cannot swallow intact tablets by crushing the tablet, suspending the freshly crushed tablet in a small amount (5 to 10 mL or 1 to 2 teaspoons) of water and immediately administering the suspension by spoon or dropper. Do not store the suspension. Do not administer in foods that decrease absorption of levothyroxine sodium tablets, such as soybean-based infant formula [see Drug Interactions (7.9)].
2.2General Principles of Dosing The dose of levothyroxine sodium tablets for hypothyroidism or pituitary TSH suppression depends on a variety of factors including: the patient's age, body weight, cardiovascular status, concomitant medical conditions (including pregnancy), concomitant medications, co-administered food and the specific nature of the condition being treated [see Dosage and Administration (2.3), Warnings and Precautions (5), and Drug Interactions (7)]. Dosing must be individualized to account for these factors and dose adjustments made based on periodic assessment of the patient's clinical response and laboratory parameters [see Dosage and Administration (2.4)].
The peak therapeutic effect of a given dose of levothyroxine sodium tablets may not be attained for 4 to 6 weeks.
2.3Dosing in Specific Patient Populations Primary Hypothyroidism in Adults and in Adolescents in Whom Growth and Puberty are Complete Start levothyroxine sodium tablets at the full replacement dose in otherwise healthy, non-elderly individuals who have been hypothyroid for only a short time (such as a few months). The average full replacement dose of levothyroxine sodium tablets is approximately 1.6 mcg per kg per day (for example: 100 to 125 mcg per day for a 70 kg adult). Adjust the dose by 12.5 to 25 mcg increments every 4 to 6 weeks until the patient is clinically euthyroid and the serum TSH returns to normal.
Doses greater than 200 mcg per day are seldom required. An inadequate response to daily doses of greater than 300 mcg per day is rare and may indicate poor compliance, malabsorption, drug interactions, or a combination of these factors. For elderly patients or patients with underlying cardiac disease, start with a dose of 12.5 to 25 mcg per day.
Increase the dose every 6 to 8 weeks, as needed until the patient is clinically euthyroid and the serum TSH returns to normal. The full replacement dose of levothyroxine sodium tablets may be less than 1 mcg per kg per day in elderly patients. In patients with severe longstanding hypothyroidism, start with a dose of 12.5 to 25 mcg per day.
Adjust the dose in 12.5 to 25 mcg increments every 2 to 4 weeks until the patient is clinically euthyroid and the serum TSH level is normalized. Secondary or Tertiary Hypothyroidism Start levothyroxine sodium tablets at the full replacement dose in otherwise healthy, non-elderly individuals. Start with a lower dose in elderly patients, patients with underlying cardiovascular disease or patients with severe longstanding hypothyroidism as described above.
Serum TSH is not a reliable measure of levothyroxine sodium tablets dose adequacy in patients with secondary or tertiary hypothyroidism and should not be used to monitor therapy. Use the serum free-T4 level to monitor adequacy of therapy in this patient population. Titrate levothyroxine sodium tablets dosing per above instructions until the patient is clinically euthyroid and the serum free-T4 level i…
💊 Dosage Forms and Strengths ▾
details on one side and break-line on other side. They are supplied as follows: Tablet Strength Tablet Color/Shape Debossing Details 25 mcg Peach/Round L15 50 mcg White/Round L16 75 mcg Violet/Round L17 88 mcg Olive/Round L19 100 mcg Yellow/Round L20 112 mcg Rose/Round L21 125 mcg Tan/Round L22 137 mcg Turquoise/Round L23 150 mcg Blue/Round L24 175 mcg Lilac/Round L25 200 mcg Pink/Round L26 300 mcg Green/Round L27
⛔ Contraindications ▾
Levothyroxine sodium tablets are contraindicated in patients with uncorrected adrenal insufficiency [see Warnings and Precautions (5.3)].
⚠️ Warnings and Cautions ▾
5.1Cardiac Adverse Reactions in the Elderly and in Patients with Underlying Cardiovascular Disease Over-treatment with levothyroxine may cause an increase in heart rate, cardiac wall thickness, and cardiac contractility and may precipitate angina or arrhythmias, particularly in patients with cardiovascular disease and in elderly patients. Initiate levothyroxine sodium tablets therapy in this population at lower doses than those recommended in younger individuals or in patients without cardiac disease [see Dosage and Administration (2.3), Use in Specific Populations (8.5)].
Monitor for cardiac arrhythmias during surgical procedures in patients with coronary artery disease receiving suppressive levothyroxine sodium tablets therapy. Monitor patients receiving concomitant levothyroxine sodium tablets and sympathomimetic agents for signs and symptoms of coronary insufficiency. If cardiac symptoms develop or worsen, reduce the levothyroxine sodium tablets dose or withhold for one week and restart at a lower dose.
5.2Myxedema Coma Myxedema coma is a life-threatening emergency characterized by poor circulation and hypometabolism, and may result in unpredictable absorption of levothyroxine sodium from the gastrointestinal tract. Use of oral thyroid hormone drug products is not recommended to treat myxedema coma. Administer thyroid hormone products formulated for intravenous administration to treat myxedema coma.
5.3Acute Adrenal Crisis in Patients with Concomitant Adrenal Insufficiency Thyroid hormone increases metabolic clearance of glucocorticoids. Initiation of thyroid hormone therapy prior to initiating glucocorticoid therapy may precipitate an acute adrenal crisis in patients with adrenal insufficiency. Treat patients with adrenal insufficiency with replacement glucocorticoids prior to initiating treatment with levothyroxine sodium tablets [see Contraindications (4)].
5.4Prevention of Hyperthyroidism or Incomplete Treatment of Hypothyroidism Levothyroxine sodium tablet has a narrow therapeutic index. Over- or undertreatment with levothyroxine sodium tablets may have negative effects on growth and development, cardiovascular function, bone metabolism, reproductive function, cognitive function, emotional state, gastrointestinal function, and glucose and lipid metabolism. Titrate the dose of levothyroxine sodium tablets carefully and monitor response to titration to avoid these effects [see Dosage and Administration (2.4)].
Monitor for the presence of drug or food interactions when using levothyroxine sodium tablets and adjust the dose as necessary [see Drug Interactions (7.9) and Clinical Pharmacology (12.3)].
5.5Worsening of Diabetic Control Addition of levothyroxine therapy in patients with diabetes mellitus may worsen glycemic control and result in increased antidiabetic agent or insulin requirements. Carefully monitor glycemic control after starting, changing, or discontinuing levothyroxine sodium tablets [see Drug Interactions (7.2)].
5.6Decreased Bone Mineral Density Associated with Thyroid Hormone Over-Replacement Increased bone resorption and decreased bone mineral density may occur as a result of levothyroxine over-replacement, particularly in post-menopausal women. The increased bone resorption may be associated with increased serum levels and urinary excretion of calcium and phosphorous, elevations in bone alkaline phosphatase, and suppressed serum parathyroid hormone levels. Administer the minimum dose of levothyroxine sodium tablets that achieves the desired clinical and biochemical response to mitigate this risk.
🤒 Adverse Reactions ▾
hyperthyroidism due to therapeutic overdosage [see Warnings and Precautions (5), Overdosage (10)]. They include the following: General: fatigue, increased appetite, weight loss, heat intolerance, fever, excessive sweating Central nervous system: headache, hyperactivity, nervousness, anxiety, irritability, emotional lability, insomnia Musculoskeletal: tremors, muscle weakness, muscle spasm Cardiovascular: palpitations, tachycardia, arrhythmias, increased pulse and blood pressure, heart failure, angina, myocardial infarction, cardiac arrest Respiratory: dyspnea Gastrointestinal: diarrhea, vomiting, abdominal cramps, elevations in liver function tests Dermatologic: hair loss, flushing, rash Endocrine: decreased bone mineral density Reproductive: menstrual irregularities, impaired fertility Seizures have been reported rarely with the institution of levothyroxine therapy.
Adverse Reactions in Children Pseudotumor cerebri and slipped capital femoral epiphysis have been reported in children receiving levothyroxine therapy. Overtreatment may result in craniosynostosis in infants and premature closure of the epiphyses in children with resultant compromised adult height. Hypersensitivity Reactions Hypersensitivity reactions to inactive ingredients have occurred in patients treated with thyroid hormone products.
These include urticaria, pruritus, skin rash, flushing, angioedema, various gastrointestinal symptoms (abdominal pain, nausea, vomiting and diarrhea), fever, arthralgia, serum sickness, and wheezing. Hypersensitivity to levothyroxine itself is not known to occur.
🔄 Drug Interactions ▾
7.1Drugs Known to Affect Thyroid Hormone Pharmacokinetics Many drugs can exert effects on thyroid hormone pharmacokinetics and metabolism (e.g., absorption, synthesis, secretion, catabolism, protein binding, and target tissue response) and may alter the therapeutic response to levothyroxine sodium tablets (see Tables 2 to 5 below). Table 2. Drugs That May Decrease T4 Absorption (Hypothyroidism)\ Potential impact: Concurrent use may reduce the efficacy of levothyroxine sodium tablets by binding and delaying or preventing absorption, potentially resulting in hypothyroidism.
Drug or Drug Class Effect Calcium Carbonate Ferrous Sulfate Calcium carbonate may form an insoluble chelate with levothyroxine, and ferrous sulfate likely forms a ferric-thyroxine complex. Administer levothyroxine sodium tablets at least 4 hours apart from these agents. Orlistat Monitor patients treated concomitantly with orlistat and levothyroxine sodium tablets for changes in thyroid function.
Bile Acid Sequestrants -Colesevelam -Cholestyramine -Colestipol Ion Exchange Resins -Kayexalate -Sevelamer Bile acid sequestrants and ion exchange resins are known to decrease levothyroxine absorption. Administer levothyroxine sodium tablets at least 4 hours prior to these drugs or monitor TSH levels. Other drugs: Proton Pump Inhibitors Sucralfate Antacids - Aluminum & Magnesium Hydroxides - Simethicone Gastric acidity is an essential requirement for adequate absorption of levothyroxine.
Sucralfate, antacids and proton pump inhibitors may cause hypochlorhydria, affect intragastric pH, and reduce levothyroxine absorption. Monitor patients appropriately. Table 3.
Drugs That May Alter T4 and Triiodothyronine (T3) Serum Transport Without Affecting Free Thyroxine (FT4) Concentration (Euthyroidism) Drug or Drug Class Effect Clofibrate Estrogen-containing oral contraceptives Estrogens (oral) Heroin / Methadone 5-Fluorouracil Mitotane Tamoxifen These drugs may increase serum thyroxine-binding globulin (TBG) concentration. Androgens / Anabolic Steroids Asparaginase Glucocorticoids Slow-Release Nicotinic Acid These drugs may decrease serum TBG concentration. Potential impact (below): Administration of these agents with levothyroxine sodium tablets results in an initial transient increase in FT4.
Continued administration results in a decrease in serum T4 and normal FT4 and TSH concentrations. Salicylates (> 2 g/day) Salicylates inhibit binding of T4 and T3 to TBG and transthyretin. An initial increase in serum FT4 is followed by return of FT4 to normal levels with sustained therapeutic serum salicylate concentrations, although total T4 levels may decrease by as much as 30%.
Other drugs: Carbamazepine Furosemide (> 80 mg IV) Heparin Hydantoins Non-Steroidal Anti-inflammatory Drugs -Fenamates These drugs may cause protein-binding site displacement. Furosemide has been shown to inhibit the protein binding of T4 to TBG and albumin, causing an increase free T4 fraction in serum. Furosemide competes for T4-binding sites on TBG, prealbumin, and albumin, so that a single high dose can acutely lower the total T4 level.
Phenytoin and carbamazepine reduce serum protein binding of levothyroxine, and total and free T4 may be reduced by 20% to 40%, but most patients have normal serum TSH levels and are clinically euthyroid. Closely monitor thyroid hormone parameters. Table 4.
Drugs That May Alter Hepatic Metabolism of T4 (Hypothyroidism) Potential impact: Stimulation of hepatic microsomal drug-metabolizing enzyme activity may cause increased hepatic degradation of levothyroxine, resulting in increased levothyroxine sodium tablets requirements. Drug or Drug Class Effect Phenobarbital Rifampin Phenobarbital has been shown to reduce the response to thyroxine. Phenobarbital increases L-thyroxine metabolism by inducing uridine 5’-diphospho-glucuronosyltransferase (UGT) and leads to a lower T4 serum levels.
Changes in thyroid status may occur if barbiturates are added or withdrawn from patients be…
👥 Use in Specific Populations ▾
8.1Pregnancy Risk Summary Experience with levothyroxine use in pregnant women, including data from post-marketing studies, have not reported increased rates of major birth defects or miscarriages [see Data]. There are risks to the mother and fetus associated with untreated hypothyroidism in pregnancy. Since TSH levels may increase during pregnancy, TSH should be monitored and levothyroxine sodium tablets dosage adjusted during pregnancy [see Clinical Considerations].
There are no animal studies conducted with levothyroxine during pregnancy. Levothyroxine sodium tablets should not be discontinued during pregnancy and hypothyroidism diagnosed during pregnancy should be promptly treated. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown.
In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively. Clinical Considerations Disease-Associated Maternal and/or Embryo/Fetal Risk Maternal hypothyroidism during pregnancy is associated with a higher rate of complications, including spontaneous abortion, gestational hypertension, pre-eclampsia, stillbirth, and premature delivery. Untreated maternal hypothyroidism may have an adverse effect on fetal neurocognitive development.
Dose Adjustments During Pregnancy and the Postpartum Period Pregnancy may increase levothyroxine sodium tablets requirements. Serum TSH levels should be monitored and the levothyroxine sodium tablets dosage adjusted during pregnancy. Since postpartum TSH levels are similar to preconception values, the levothyroxine sodium tablets dosage should return to the pre-pregnancy dose immediately after delivery [see Dosage and Administration (2.3)].
Data Human Data Levothyroxine is approved for use as a replacement therapy for hypothyroidism. There is a long experience of levothyroxine use in pregnant women, including data from post-marketing studies that have not reported increased rates of fetal malformations, miscarriages or other adverse maternal or fetal outcomes associated with levothyroxine use in pregnant women.
8.2Lactation Risk Summary Limited published studies report that levothyroxine is present in human milk. However, there is insufficient information to determine the effects of levothyroxine on the breastfed infant and no available information on the effects of levothyroxine on milk production. Adequate levothyroxine treatment during lactation may normalize milk production in hypothyroid lactating mothers.
The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for levothyroxine sodium tablets and any potential adverse effects on the breastfed infant from levothyroxine sodium tablets or from the underlying maternal condition.
8.4Pediatric Use The initial dose of levothyroxine sodium tablets varies with age and body weight. Dosing adjustments are based on an assessment of the individual patient's clinical and laboratory parameters [see Dosage and Administration (2.3, 2.4)]. In children in whom a diagnosis of permanent hypothyroidism has not been established, discontinue levothyroxine sodium tablets administration for a trial period, but only after the child is at least 3 years of age.
Obtain serum T4 and TSH levels at the end of the trial period, and use laboratory test results and clinical assessment to guide diagnosis and treatment, if warranted. Congenital Hypothyroidism [See Dosage and Administration (2.3, 2.4)] Rapid restoration of normal serum T4 concentrations is essential for preventing the adverse effects of congenital hypothyroidism on intellectual development as well as on overall physical growth and maturation. Therefore, initiate levothyroxine sodium tablets therapy immediately upon diagnosis.
Levothyroxine is generally continued for life in these patients. Closely monitor infants during the first 2 weeks of levothyrox…
🆘 Overdosage ▾
The signs and symptoms of overdosage are those of hyperthyroidism [see Warnings and Precautions (5) and Adverse Reactions (6)]. In addition, confusion and disorientation may occur. Cerebral embolism, shock, coma, and death have been reported.
Seizures occurred in a 3-year old child ingesting 3.6 mg of levothyroxine. Symptoms may not necessarily be evident or may not appear until several days after ingestion of levothyroxine sodium. Reduce the levothyroxine sodium tablets dose or discontinue temporarily if signs or symptoms of overdosage occur.
Initiate appropriate supportive treatment as dictated by the patient's medical status. For current information on the management of poisoning or overdosage, contact the National Poison Control Center at 1-800-222-1222 or www.poison.org.
🧬 Clinical Pharmacology ▾
12.1Mechanism of Action Thyroid hormones exert their physiologic actions through control of DNA transcription and protein synthesis. Triiodothyronine (T3) and L-thyroxine (T4) diffuse into the cell nucleus and bind to thyroid receptor proteins attached to DNA. This hormone nuclear receptor complex activates gene transcription and synthesis of messenger RNA and cytoplasmic proteins.
The physiological actions of thyroid hormones are produced predominantly by T3, the majority of which (approximately 80%) is derived from T4 by deiodination in peripheral tissues.
12.2Pharmacodynamics Oral levothyroxine sodium is a synthetic T4 hormone that exerts the same physiologic effect as endogenous T4, thereby maintaining normal T4 levels when a deficiency is present.
12.3Pharmacokinetics Absorption Absorption of orally administered T4 from the gastrointestinal tract ranges from 40% to 80%. The majority of the levothyroxine sodium tablets dose is absorbed from the jejunum and upper ileum. The relative bioavailability of levothyroxine sodium tablets, compared to an equal nominal dose of oral levothyroxine sodium solution, is approximately 93%.
T4 absorption is increased by fasting, and decreased in malabsorption syndromes and by certain foods such as soybeans. Dietary fiber decreases bioavailability of T4. Absorption may also decrease with age.
In addition, many drugs and foods affect T4 absorption [see Drug Interactions (7)]. Distribution Circulating thyroid hormones are greater than 99% bound to plasma proteins, including thyroxine-binding globulin (TBG), thyroxine-binding prealbumin (TBPA), and albumin (TBA), whose capacities and affinities vary for each hormone. The higher affinity of both TBG and TBPA for T4 partially explains the higher serum levels, slower metabolic clearance, and longer half-life of T4 compared to T3.
Protein-bound thyroid hormones exist in reverse equilibrium with small amounts of free hormone. Only unbound hormone is metabolically active. Many drugs and physiologic conditions affect the binding of thyroid hormones to serum proteins [see Drug Interactions (7)].
Thyroid hormones do not readily cross the placental barrier [see Use in Specific Populations (8.1)]. Elimination Metabolism T4 is slowly eliminated (see Table 7). The major pathway of thyroid hormone metabolism is through sequential deiodination.
Approximately 80% of circulating T3 is derived from peripheral T4 by monodeiodination. The liver is the major site of degradation for both T4 and T3, with T4 deiodination also occurring at a number of additional sites, including the kidney and other tissues. Approximately 80% of the daily dose of T4 is deiodinated to yield equal amounts of T3 and reverse T3 (rT3).
T3 and rT3 are further deiodinated to diiodothyronine. Thyroid hormones are also metabolized via conjugation with glucuronides and sulfates and excreted directly into the bile and gut where they undergo enterohepatic recirculation. Excretion Thyroid hormones are primarily eliminated by the kidneys.
A portion of the conjugated hormone reaches the colon unchanged and is eliminated in the feces. Approximately 20% of T4 is eliminated in the stool. Urinary excretion of T4 decreases with age.
Table 7. Pharmacokinetic Parameters of Thyroid Hormones in Euthyroid Patients * Includes TBG, TBPA, and TBA † 3 to 4 days in hyperthyroidism, 9 to 10 days in hypothyroidism Hormone Ratio in Thyroglobulin Biologic Potency t1/2 (days) Protein Binding (%)* Levothyroxine (T4) 10 to 20 1 6 to 7†
99.96Liothyronine (T3) 1 4 ≤ 2 99.5
📦 How Supplied / Storage and Handling ▾
Levothyroxine sodium tablets USP are round, colored, scored and debossed with following debossing details on one side and break-line on other side. Storage Conditions Store at 25°C (77°F); excursions permitted to 15° to 30° C (59° to 86° F) [see USP Controlled Room Temperature]. Levothyroxine sodium tablets USP should be protected from light and moisture.
📋 Description ▾
Levothyroxine sodium tablets USP contain synthetic crystalline L-3,3',5,5' tetraiodothyronine sodium salt [levothyroxine (T4) sodium]. Synthetic T4 is chemically identical to that produced in the human thyroid gland. Levothyroxine (T4) sodium has an empirical formula of C15H10I4N NaO4•xH2O, molecular weight of 798.85 (anhydrous), and structural formula as shown: [image-1] Levothyroxine sodium tablets USP for oral administration are supplied in the following strengths: 25 mcg, 50 mcg, 75 mcg, 88 mcg, 100 mcg, 112 mcg, 125 mcg, 137 mcg, 150 mcg, 175 mcg, 200 mcg, and 300 mcg.
Each levothyroxine sodium tablets USP contains the inactive ingredients corn starch, croscarmellose sodium, magnesium stearate, mannitol and sodium bicarbonate. Table 6 provides a listing of the color additives by tablet strength: * Note – FD&C Yellow No. 6 is peach in color.
Strength (mcg) Color additive(s) 25 FD&C Yellow No. 6 Aluminum Lake* 50 FD&C Blue 1 Aluminum Lake 75 FD&C Red No. 40 Aluminum Lake, FD&C Blue No.
2 Aluminum Lake 88 FD&C Yellow No. 6 Aluminum Lake*, FD&C Blue No. 1 Aluminum Lake, D&C Yellow No.
10 Aluminum Lake 100 FD&C Yellow No. 6 Aluminum Lake*, D&C Yellow No. 10 Aluminum Lake 112 D&C Red No 27 Aluminum Lake 125 FD&C Yellow No.
6 Aluminum Lake*, FD&C Blue No. 1 Aluminum Lake, FD&C Red No. 40 Aluminum Lake, FD&C Blue No.
2 Aluminum Lake 137 FD&C Blue No. 1 Aluminum Lake 150 FD&C Blue No. 2 Aluminum Lake 175 FD&C Blue No.
1 Aluminum Lake, D&C Red No. 27 Aluminum Lake 200 FD&C Red No. 40 Aluminum Lake 300 FD&C Yellow No.
6 Aluminum Lake*, FD&C Blue No. 1 Aluminum Lake, D&C Yellow No. 10 Aluminum Lake