Disclaimer: This article is for informational purposes only and does not constitute medical advice. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition.
Overview
Synthroid® contains levothyroxine, a synthetic thyroid hormone widely used in Canada.
Synthroid® is a brand-name medication containing levothyroxine sodium, a synthetic form of the thyroid hormone thyroxine (T4). It is designed to replace or supplement thyroid hormone in the body. Other competing Canadian brands containing levothyroxine include Eltroxin, Levoxyl, and Unithroid. These brands are bioequivalent but may differ in inactive ingredients or tablet appearance. Synthroid® is regulated and marketed in Canada under Health Canada’s drug approval framework, ensuring quality, safety, and efficacy.
How Synthroid® Works
: Levothyroxine mimics natural thyroid hormone to regulate body metabolism.
Synthroid® works by supplying the body with synthetic thyroxine (T4), which is converted in tissues to the active form triiodothyronine (T3). These hormones enter cells and bind to nuclear receptors, modulating gene expression that controls metabolism, energy production, and growth processes. This helps maintain normal physiological functions that depend on thyroid hormones.
Dosage Instructions of Synthroid®
Available as oral tablets in multiple strengths for flexible dosing.
In Canada, Synthroid® is available primarily in oral tablet form. Tablets come in several strengths, ranging typically from 25 mcg up to 200 mcg, allowing healthcare providers to tailor dosing according to individual patient needs. The tablets are film-coated for ease of swallowing and consistent absorption.
Follow doctor’s guidance; take on an empty stomach for best absorption.
It is generally recommended to take Synthroid® tablets on an empty stomach, preferably 30 to 60 minutes before breakfast. Consistent daily timing helps maintain stable hormone levels. Avoid taking with foods or supplements that can affect absorption, such as calcium or iron, within a few hours. Always adhere to the dosage prescribed by your healthcare professional.
Storage Instructions
Store in a cool, dry place away from light and moisture. Keep Synthroid® tablets tightly closed in their original container. Store at room temperature between 15°C to 30°C, away from excess heat, humidity, and direct sunlight. Proper storage helps maintain medication stability and effectiveness.
Side Effects of Synthroid®
Common mild effects and rare serious reactions to watch for.
Common side effects may include mild symptoms like headache, nervousness, or sweating, especially if the dose is too high. Serious side effects are rare but can include heart palpitations or chest pain. Any unusual or severe reactions should prompt immediate consultation with a healthcare provider.
Important Safety Information About Synthroid®
Follow Health Canada warnings; notify doctor of any health changes.
Health Canada advises that Synthroid® should be used under medical supervision. Notify your healthcare provider of any heart disease, adrenal gland problems, or allergies prior to use. Regular monitoring of thyroid hormone levels is essential to ensure safe and effective treatment.
Drug Interactions
Avoid certain supplements and medications that affect absorption or metabolism.
Synthroid® may interact with calcium supplements, iron products, antacids, and some cholesterol-lowering drugs, which can reduce its absorption. Certain medications such as anticoagulants or seizure drugs may also alter its effects. Inform your healthcare provider about all medications and supplements you are taking.
Brands & DIN Number of Synthroid®
Brand Names
- Synthroid®
- Eltroxin
- Levoxyl
DIN (Drug Identification Numbers)
02230667
Key Takeaways
- 1• Synthroid® contains synthetic levothyroxine sodium, a thyroid hormone replacement.
- 2• Available in multiple oral tablet strengths to suit individual needs.
- 3• Works by replacing natural thyroid hormone to regulate metabolism.
- 4• Take on an empty stomach to maximize absorption.
- 5• Possible side effects range from mild to serious; consult a doctor if concerned.
- 6• Avoid interactions with calcium, iron, and certain medications.
- 7• Store tablets in a cool, dry place away from light.
- 8• Prescription-only medication in Canada, regulated by Health Canada.