What is Synthroid?
Synthroid (levothyroxine) is a prescription medication used to treat hypothyroidism, a condition caused by the thyroid gland, a small organ in the neck, not making enough thyroid hormone.
Your body needs this hormone to keep your metabolism, energy, and growth working correctly.
Synthroid is a drug that contains levothyroxine, a man-made form of the thyroid hormone. It helps to replace the missing hormone so your body can function normally.
Doctors give Synthroid to adults, children, and even newborns when their thyroids are not working well due to problems in the thyroid or in parts of the brain that control it.
Doctors also use the Synthroid drug to help treat a certain type of thyroid cancer. In this case, it helps lower the amount of a natural hormone called TSH (thyroid-stimulating hormone), which can slow down cancer growth.
However, Synthroid is not meant to treat non-cancerous thyroid swelling or to help with weight loss.
How Does Synthroid Work?
Synthroid is a man-made version of a natural hormone called T4, which your thyroid gland makes typically. If you have hypothyroidism, it means your body does not produce enough of this hormone.
Synthroid works by giving your body the T4 it is missing. Your body then uses T4 to make another important hormone called T3. These hormones help control your energy, metabolism, heart rate, and many other functions.
Synthroid helps restore hormone levels and can reduce symptoms like tiredness, weight gain, and cold symptoms.
Synthroid is also used to lower levels of TSH, or thyroid-stimulating hormone. TSH tells your thyroid to make more hormones and can help specific thyroid cancer cells grow.
It may take 4 to 6 weeks to feel the full effects of Synthroid, and your doctor will check your hormone levels with blood tests to ensure the dose is correct.
Dose Information and Usage
Synthroid is a tablet taken once daily, usually on an empty stomach, 30 to 60 minutes before breakfast.
The Synthroid dose varies based on age, body weight, medical conditions, and other factors. Proper dosing and timing are key to effective treatment and to avoid the risk of Synthroid overdose.
Always follow your doctor’s instructions for the best results.
Dosage Form and Strengths of Synthroid
Synthroid tablets are available in multiple strengths to meet individualized dosing needs:
- 25 mcg
- 50 mcg
- 75 mcg
- 88 mcg
- 100 mcg
- 112 mcg
- 125 mcg
- 137 mcg
- 150 mcg
- 175 mcg
- 200 mcg
- 300 mcg
How to Take Synthroid?
Take Synthroid exactly as your doctor tells you. The timing and method of taking your Synthroid dose affect its effectiveness.
Always take it on an empty stomach, and be consistent with the timing daily.
- Take your dose once daily, in the morning, on an empty stomach.
- Wait 30 to 60 minutes before eating or drinking anything other than water.
- Take Synthroid at least 4 hours before or after taking medications or supplements that can affect absorption (such as calcium, iron, or antacids).
- Swallow the tablet whole with a full glass of water.
Special Considerations and Instructions for Specific Populations:
- Pregnant women: May need a higher Synthroid dose during pregnancy. TSH should be checked each trimester.
- Children: Doses are based on weight and age. For infants, tablets may be crushed and mixed with water.
- Older adults or heart patients: Often start with a lower dose to reduce the risk of heart problems.
- Avoid foods like soy, fiber-rich meals, and walnuts near your dosing time as they can interfere with absorption.
If you miss a dose, take it as soon as you remember. Do not double your next dose. In case of Synthroid overdose, seek medical help right away.
Synthroid Side Effects
Synthroid can help people with low thyroid hormone levels, but it can also cause side effects. Some of the common side effects of Synthroid include weight loss, anxiety, hair loss, and trouble sleeping.
However, in rare cases, Synthroid may cause more serious problems like irregular heartbeat, chest pain, or bone thinning.
These Synthroid medication side effects may happen if your dosage is too high or too low. Taking the prescribed dose and talking to your doctor if anything feels off are important.
Common Side Effects
These are common side effects of Synthroid that many people may experience, especially when starting the medication or adjusting the dose:
- Anxiety or irritability
- Trouble sleeping
- Weight loss
- Increased appetite
- Diarrhea
- Muscle weakness or cramps
- Hair loss (usually temporary)
- Shortness of breath
- Irregular periods (in females)
- Mild skin rash
Most of these side effects go away on their own. If they continue or get worse, talk to your doctor.
Severe Side Effects
Although rare, some people may experience serious Synthroid medication side effects. Contact your doctor right away if you notice any of the following:
- Fast or irregular heartbeat
- Chest pain
- Dizziness or fainting
- High blood pressure
- Signs of a heart attack (like chest tightness or shortness of breath)
- Bone fractures or weak bones
- Sudden weight changes
- Severe allergic reactions (swelling of face, lips, or throat; rash; difficulty breathing)
- Vision problems or headaches in children (may be a sign of pressure in the brain)
- Hip pain or limping in children (linked to bone growth issues)
These Synthroid long-term side effects of Synthroid may occur if your thyroid levels stay too high for too long. Regular checkups can help prevent this.
Warnings and Precautions
Synthroid is a medication used to treat low levels of thyroid hormone, but it needs to be taken with caution.
Using too much or too little can lead to serious health problems. It can affect many body parts, including the heart, bones, blood sugar, and brain.
Children, older adults, pregnant or breastfeeding women, and people with other medical conditions may be at higher risk of side effects.
Here are the warnings and precautions when taking Synthroid:
- Taking too much or reporting Synthroid can affect many systems in the body, such as the heart, bones, brain, and metabolism. This is because Synthroid has a narrow range of safe and effective doses.
- Too little Synthroid can slow down learning and physical growth in children. This may cause problems with school performance and shorter height as they grow older.
- Too much Synthroid can cause children’s skull bones to close early and grow too fast, affecting their normal development and overall health.
- In older adults or people with heart conditions, taking too much Synthroid can increase the heart rate, raise blood pressure, or cause chest pain and abnormal heart rhythms. This can lead to serious complications like heart attacks.
- People with heart disease who are taking Synthroid should be closely watched during surgery. The stress of surgery combined with Synthroid can increase the risk of heart problems.
- Myxedema coma is a rare but life-threatening condition linked to very low thyroid hormone levels. It causes the body to slow down severely and may lead to shock or even death. Synthroid tablets should not be used to treat this emergency. Instead, thyroid medication must be given through a vein in the hospital.
- If you have untreated adrenal gland problems, starting Synthroid can cause a dangerous drop in blood pressure known as an adrenal crisis. You must treat the adrenal issue first with steroids before taking Synthroid.
- People with diabetes may see a rise in blood sugar levels when they start or change their dose of Synthroid. This means they might need to adjust their diabetes medication or insulin after beginning treatment.
- Taking too much Synthroid for a long time can weaken your bones and increase the risk of fractures, especially in postmenopausal women. This happens because too much thyroid hormone speeds up bone loss. Your body needs more thyroid hormones during pregnancy. If you are already taking Synthroid, your doctor may need to increase your dose to support your health and the baby’s development.
- If breastfeeding, small amounts of Synthroid may pass into your breast milk.
- Some birth control pills may affect how Synthroid works. Your doctor may need to adjust your Synthroid dose or give you advice about safe birth control options while on this medication.
Drug Interactions With Other Medications
Some other drugs, foods, or supplements can change how Synthroid works in your body.
These interactions can make Synthroid less effective or cause side effects. Always tell your doctor about all the medications and supplements you take. Your doctor may need to adjust your dose or check your thyroid levels more often.
- Calcium carbonate
- Ferrous sulfate (iron supplements)
- Sevelamer
- Lanthanum
- Orlistat
- Cholestyramine
- Colesevelam
- Colestipol
- Kayexalate
- Sucralfate
- Antacids (aluminum, magnesium hydroxides, simethicone)
- Proton pump inhibitors (like omeprazole)
- Clofibrate
- Estrogens (including oral contraceptives)
- Heroin
- Methadone
- 5-Fluorouracil
- Mitotane
- Tamoxifen
- Androgens
- Anabolic steroids
- Asparaginase
- Glucocorticoids
- Slow-release nicotinic acid
- Salicylates (over 2 g/day)
- Carbamazepine
- Furosemide (over 80 mg IV)
- Heparin
- Hydantoins (phenytoin)
- NSAIDs
- Phenobarbital
- Rifampin
- Propranolol (over 160 mg/day)
- Dexamethasone (over 4 mg/day)
- Amiodarone
- Antidiabetic medications
- Oral anticoagulants (warfarin)
- Digitalis glycosides
- Tricyclic and tetracyclic antidepressants
- Sertraline
- Ketamine
- Sympathomimetics
- Tyrosine-kinase inhibitors (imatinib)
- Soybean flour
- Cottonseed meal
- Walnuts
- High-fiber foods
- Grapefruit juice
- Biotin supplements
Synthroid Alternatives
If you use Synthroid to manage hypothyroidism or for TSH suppression but are looking for other options, there are several effective alternatives.
These alternatives to Synthroid medications may contain different ingredients or offer different formulations that could work better for your needs.
- Levoxyl (levothyroxine)
- Tirosint (levothyroxine)
- Unithroid (levothyroxine)
- Euthyrox (levothyroxine)
- Levo-T (levothyroxine)
- Cytomel (liothyronine)
Cost & Ordering Information
Buy Synthroid Through Buy Canadian Insulin
Buy Canadian Insulin helps patients access prescription medication options through participating pharmacy partners.
Pricing may vary depending on product strength, quantity selected, supplier availability, and participating pharmacy partner pricing policies.
Some patients may find pricing through participating pharmacy partners that differs from certain U.S. retail pharmacy prices.
Available services may include:
- Pricing options based on quantity selected
- Prescription processing through participating pharmacy partners
- Shipping options available across eligible U.S. delivery locations
- Ordering support through phone, email, or live chat
- Multiple quantity options depending on prescription authorization and supplier availability
Synthroid is a prescription medication that requires review and approval by a licensed healthcare professional and pharmacist before dispensing, where applicable.
Shipping timelines may vary depending on prescription review requirements, inventory availability, destination location, and carrier services.
Synthroid Discounts and Coupons
Eligible first-time customers may use coupon code FIRST10 during checkout for qualifying orders, subject to current promotional terms and conditions.
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Patients may explore available Synthroid prescription options through participating pharmacy partners.
Available ordering features may include:
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- Multiple quantity options depending on prescription details
- Shipping options with tracking availability when provided by the carrier
- Customer support assistance through phone, email, or live chat
- Online and phone ordering availability
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Disclaimer
Buy Canadian Insulin provides educational information about medications and health conditions for informational purposes only. This content is not intended to replace professional medical advice, diagnosis, or treatment. Prescription medications require valid prescription review and processing through participating pharmacy partners. Product availability, pricing, and shipping timelines may vary. Consult your healthcare provider or pharmacist before starting, stopping, or changing any medication.
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