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Author: Admin | 2025-04-28
Levoxyl and Synthroid are brand names for the drug levothyroxine. Levoxyl and Synthroid contain the same active ingredient, levothyroxine, but they contain different inactive ingredients.Levoxyl tablets contain the inactive ingredients:Calcium sulfate dihydrateCroscarmellose sodiumMagnesium stearateMicrocrystalline celluloseSodium bicarbonateVarious color additivesSynthroid tablets contains the inactive ingredients:AcaciaConfectioner’s sugar (contains corn starch)Lactose monohydrateMagnesium stearatePovidoneTalcVarious color additivesYou may have a reaction, called a hypersensitivity reaction, to some inactive ingredients, but the active ingredient is the same in both medications and is not known to cause reactions.Therapeutic equivalentsThe U.S. Food and Drug Administration (FDA) considers these two products to be therapeutically equivalent. Therapeutically equivalent drugs are expected to produce the same clinical effect and have the same safety profile. Because of this, therapeutically equivalent drugs may be legally substituted for one another by the pharmacist during the prescription filling process, unless the prescriber indicates he or she does not want any substitutions to be dispensed.Even though the FDA has designated Levoxyl and Synthroid as therapeutic equivalents, the American Thyroid Association (ATA), in their most recently published guidelines, advises not to switch between levothyroxine products, regardless of brand name or generic status. Their concern is that such switching may result in enough variation to cause a noticeable effect on thyroid hormone levels and symptom control. The ATA notes that this is especially important for certain groups of individuals, including:Pregnant womenChildrenThose with high-risk thyroid cancerThose who are frailThere are several brand name and generic levothyroxine products available on the market. All of them require a prescription from your doctor. Levoxyl, made by Pfizer, was first marketed in 2001, and Synthroid, made by AbbVie, was first marketed in 2002. They are both brand name products.Each medication is available in many different tablet strengths. The highest strength of Levoxyl available is 200 micrograms, while the highest strength of Synthroid available is 300 micrograms.Related questionsDoes levothyroxine cause weight gain or loss?What can I eat for breakfast after taking levothyroxine?Can I take other medications with levothyroxine?Treating hypothyroidismLevothyroxine is a synthetic (man-made) form of the thyroid hormone thyroxine, often referred to as T4. Levothyroxine is used to treat hypothyroidism in adults and children.Hypothyroidism occurs
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