Synthroid

Synthroid (levothyroxine sodium) is a prescription thyroid hormone medication used to treat hypothyroidism, a state where the thyroid gland does not produce enough thyroid hormone. It contains levothyroxine, which helps restore normal hormone levels in the body. By replacing the missing hormone, Synthroid tablets help restore normal metabolism, energy levels, and overall body function.

Key information about Synthroid is summarized below:

Synthroid is prescribed to restore normal thyroid hormone levels or to control thyroid-stimulating hormone (TSH) in specific conditions.

Hypothyroidism treatment:

• Primary hypothyroidism (thyroid gland disorder).
• Secondary hypothyroidism (pituitary disorder).
• Tertiary hypothyroidism (hypothalamic disorder).
• Congenital hypothyroidism is present at birth.
• Acquired hypothyroidism in adults and children.

TSH suppression in thyroid cancer:

• Adjunct to thyroid cancer surgery.
• Used with radioactive iodine therapy.
• For thyrotropin-dependent well-differentiated thyroid cancer.

Synthroid tablets are not indicated for:

• Suppression of benign thyroid nodules in iodine-sufficient patients.
• Nontoxic diffuse goiter without hormone deficiency.
• Hypothyroidism during recovery from subacute thyroiditis.

Synthroid (levothyroxine) works by replacing the thyroid hormone T4 (thyroxine) that the body is unable to produce in adequate amounts.

• Levothyroxine (T4) enters cells and moves into the cell nucleus.
• It binds to thyroid hormone receptors attached to DNA.
• This interaction activates gene transcription and protein synthesis.
• Most T4 is converted into the active hormone T3 in peripheral tissues.
• T3 produces the majority of thyroid hormone effects in the body.

Ultimately, this helps restore normal thyroid hormone activity in the body.

Follow your healthcare provider’s instructions when taking this medication. General guidelines include:

• Take once daily: The tablet is usually taken as a single daily dose.
• Take on an empty stomach: Take Synthroid about 30 to 60 minutes before breakfast.
• Follow prescription instructions: Take Synthroid exactly as directed and do not change the dose without medical advice.
• Avoid certain supplements together: Do not take Synthroid within 4 hours of iron or calcium supplements.
• Separate from antacids: Antacids containing aluminum or magnesium may reduce absorption.
• Report health changes: Inform your doctor if you are pregnant, breastfeeding, or planning pregnancy.
• Attend follow-up monitoring: Thyroid hormone therapy may require regular medical checkups and laboratory tests.

The appropriate Synthroid dosage depends on age, body weight, cardiovascular status, and the condition being treated. Your healthcare provider will determine the correct dose.

Typical adult dosage for hypothyroidism:

Doses greater than 200 mcg/day are rarely required. Daily doses above 300 mcg/day may indicate poor absorption or drug interactions.

Pediatric dosage for hypothyroidism:

The starting dose in children depends on age and body weight.

Important dosage information:

• Dose adjustments are typically made every 4 to 6 weeks.
• Thyroid-stimulating hormone (TSH) or free T4 levels are used to monitor therapy.
• Regular blood tests help determine whether dose adjustments are required.
• The peak therapeutic effect of a Synthroid dose may take 4 to 6 weeks to occur.

Taking more than the recommended dose may cause symptoms related to excessive thyroid hormone levels. Reported symptoms of overdose may include:

• Rapid or irregular heartbeat
• Nervousness or tremors
• Confusion or disorientation
• Severe hyperthyroid symptoms
• In rare cases, seizures, shock, coma, or death

Lower the dosage or discontinue temporarily if signs or symptoms of overdose occur. If an overdose is suspected, seek immediate emergency medical help or contact a poison control center.

Synthroid tablets may cause side effects in some patients, particularly if the dose exceeds the body’s requirements.

Common Side Effects

Commonly reported Synthroid side effects include:

• Fatigue
• Increased appetite
• Weight loss
• Heat intolerance
• Excessive sweating
• Headache
• Nervousness or anxiety
• Irritability
• Insomnia (trouble sleeping)
• Tremors
• Muscle weakness
• Diarrhea
• Vomiting
• Abdominal cramps
• Hair loss
• Skin rash
• Flushing

Rare or Serious Side Effects

Seek immediate medical attention if you experience any of the following:

• Palpitations
• Rapid heartbeat (tachycardia)
• Irregular heartbeat (arrhythmias)
• Increased blood pressure
• Chest pain or angina
• Heart failure or myocardial infarction
• Seizures
• Decreased bone mineral density
• Menstrual irregularities
• Impaired fertility
• Severe allergic reactions such as wheezing, rash, swelling, or itching

This is not a complete list of side effects. Contact your healthcare provider for medical advice about adverse reactions. You may report side effects to the FDA at 1-800-FDA-1088 or visit MedWatch.

Keep the following warnings and precautions in mind while taking Synthroid:

• Overtreatment or undertreatment risk: Incorrect dosing may affect growth, heart function, metabolism, and other body systems.
• Cardiac complications: Excess thyroid hormone may cause a rapid heart rate, arrhythmias, or angina, especially in elderly patients.
• Cardiovascular disease caution: Patients with underlying heart disease should start therapy at lower doses and increase gradually.
• Myxedema coma: Oral thyroid hormone products are not recommended for the treatment of myxedema coma emergencies.
• Adrenal insufficiency risk: Starting thyroid hormone therapy may trigger acute adrenal crisis in untreated adrenal insufficiency.
• Worsening diabetes control: Levothyroxine therapy may increase blood glucose levels and require adjustment of diabetes medications.
• Bone mineral density loss: Excessive thyroid hormone replacement may reduce bone density, particularly in postmenopausal women. TSH levels should be monitored approximately 6 to 8 weeks after starting treatment or after any dosage adjustment to ensure appropriate thyroid hormone levels.

Pregnancy and Breastfeeding

Synthroid tablets may be used during pregnancy to treat hypothyroidism. Untreated hypothyroidism during pregnancy can increase the risk of complications for both the baby and mother. Thyroid hormone levels should be monitored, and the dosage may need adjustment during pregnancy and after delivery. It may pass into breast milk, but no harmful effects in breastfed infants have been reported. Always consult a healthcare provider before using Synthroid during pregnancy or while breastfeeding.

Synthroid may interact with certain medications that affect thyroid hormone absorption, metabolism, or activity. Examples include the following:

• Antacids and acid-reducing medications: Drugs containing aluminum or magnesium, proton pump inhibitors, or sucralfate may reduce levothyroxine absorption.
• Bile acid sequestrants: Medications such as cholestyramine or colestipol may decrease levothyroxine absorption.
• Phosphate binders: Drugs such as sevelamer or lanthanum may interfere with levothyroxine absorption.
• Heart medications: Drugs such as amiodarone or high-dose beta-blockers may affect thyroid hormone metabolism.
• Antidiabetic medications: Synthroid may alter blood glucose control and require adjustment of diabetes medications or insulin.
• Blood thinners: Levothyroxine may increase the effects of oral anticoagulants, requiring closer monitoring.
• Antidepressants: Tricyclic antidepressants or drugs such as sertraline may alter the response to Synthroid.
• Enzyme-inducing medications: Drugs such as phenobarbital or rifampin may increase thyroid hormone metabolism.
• Cancer therapies: Tyrosine-kinase inhibitors such as imatinib may affect thyroid hormone levels.

Patients should inform their healthcare provider about all supplements, over-the-counter drugs, and prescription medications they use before starting Synthroid tablets.

Both Synthroid and levothyroxine contain the same active ingredient, levothyroxine sodium. Synthroid is a brand-name medication, while levothyroxine is the generic version. Both medicines work the same way to replace thyroid hormone in patients with hypothyroidism. Healthcare providers may prescribe either option depending on cost, availability, and patient response.

Healthcare providers may prescribe other thyroid medications depending on the patient’s condition and treatment response.

Brand availability may vary depending on location and pharmacy supply. A healthcare provider will determine the most appropriate option based on the patient’s symptoms and treatment response.

Prescription thyroid medications may be costly at many U.S. retail pharmacies. Ordering Synthroid online from Polar Bear Meds may help reduce overall costs while maintaining safety, quality, and reliability.

• Pricing may be lower compared with some U.S. retail pharmacies.
• Medications sourced from licensed and reputable Canadian pharmacies.
• Properly dispensed prescription products under regulatory standards.
• Transparent pricing with no hidden fees.
• U.S. customers can order with a valid prescription.
• Simple online ordering with easy prescription upload.
• Discreet packaging with order tracking for added security.
• Shipping across the United States typically takes 3-5 business days via Xpress Post.
• Shipping timelines may vary depending on processing requirements and location.
• Dedicated customer support team to assist with prescriptions, orders, and delivery questions.
• Additional savings with coupon code WELCOMEPB10: 10% off your first order.

All Synthroid orders require a valid prescription. Medications are dispensed by licensed pharmacies that comply with applicable pharmacy regulations and safety standards.

• https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=1e11ad30-1041-4520-10b0-8f9d30d30fcc&audience=consumer
• https://www.accessdata.fda.gov/drugsatfda_docs/label/2022/021402Orig1s036Correctedlbl.pdf