April 19, 2014
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Drug Factsheets

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Synthroid

(levothyroxine)

DIN (Drug Identification Number)

02172062 SYNTHROID 25G TABLET
02172070 SYNTHROID 50G TABLET
02172089 SYNTHROID 75G TABLET
02172097 SYNTHROID 88MG TABLET
02171228 SYNTHROID 112G TABLET
02172119 SYNTHROID 125G TABLET
02172127 SYNTHROID 50G TABLET
02172135 SYNTHROID 175G TABLET
02172100 SYNTHROID 100G TABLET
02172143 SYNTHROID 200G TABLET
02172151 SYNTHROID 300G TABLET
02233852 SYNTHROID 137G TABLET

How does Synthroid work? What will it do for me?

Levothyroxine is a thyroid hormone supplement used to treat people who do not produce enough thyroid hormone on their own. Levothyroxine helps to reduce the symptoms of low thyroid hormone such as weight gain, sensitivity to cold, lack of energy, and dry skin. It may take several weeks for this medication to have a noticeable effect on your condition.

Your doctor may have suggested this medication for conditions other than those listed in these drug information articles. As well, some forms of this medication may not be used for all of the conditions discussed here. If you have not discussed this with your doctor or are not sure why you are being given this medication, speak to your doctor. Do not stop using this medication without consulting your doctor.

Do not give this medication to anyone else, even if they have the same symptoms as you do. It can be harmful for people to use this medication if their doctor has not prescribed it.

How should I use Synthroid?

The dose of levothyroxine depends on how much of the hormone is needed to bring blood levels back to the normal range. This is determined by blood tests that are done in a laboratory. The starting dose will depend on the general physical condition of the person taking the medication and the severity and duration of time that symptoms of low thyroid hormone levels have been present.

You should take this medication once a day at the same time every day to ensure a consistent effect.

Signs that you may be getting too much thyroid hormone may include chest pain, increased heart rate, palpitations, excessive sweating, heat intolerance, and nervousness. If you think your dose of thyroid hormone may be too high, consult your doctor as soon as possible.

Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications. If your doctor has recommended a dose different from the ones given here, do not change the way that you are using the medication without consulting your doctor.

It is important to use this medication exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.

Store this medication at room temperature, protect it from light and moisture, and keep it out of the reach of children.

This medication is available under multiple brand names and/or in several different forms. Any specific brand name of this medication may not be available in all of the forms listed here. The forms available for the specific brand you have searched are listed under "What form(s) does this medication come in?"

Do not dispose of medications in wastewater (e.g. down the sink or in the toilet) or in household garbage. Ask your pharmacist how to dispose of medications that are no longer needed or have expired.





What form(s) does Synthroid come in?

25 µg
Each orange, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 25 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, FD&C Yellow No. 6, lactose, magnesium stearate, povidone, and talc.

50 µg
Each white, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 50 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, lactose, magnesium stearate, povidone, and talc.

75 µg
Each violet, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 75 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, FD&C Blue No. 2, FD&C Red No. 40, lactose, magnesium stearate, povidone, and talc.

88 µg
Each olive, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 88 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, D&C Yellow No. 10, FD&C Blue No. 1, FD&C Yellow No. 6, lactose, magnesium stearate, povidone, and talc.

100 µg
Each yellow, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 100 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, D&C Yellow No. 10, FD&C Yellow No. 6, lactose, magnesium stearate, povidone, and talc.

112 µg
Each rose, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 112 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, D&C Red No. 27, D&C Red No. 30, lactose, magnesium stearate, povidone, and talc.

125 µg
Each brown, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 125 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, FD&C Blue No. 1, FD&C Red No. 40, FD&C Yellow No. 6, lactose, magnesium stearate, povidone, and talc.

137 µg
Each turquoise, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 137 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, FD&C Blue No. 1, lactose, magnesium stearate, povidone, and talc.

150 µg
Each blue, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 150 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, FD&C Blue No. 2, lactose, magnesium stearate, povidone, and talc.

175 µg
Each lilac, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 175 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, D&C Red No. 27 & D&C Red No. 30, FD&C Blue No. 1, lactose, magnesium stearate, povidone, and talc.

200 µg
Each pink, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 200 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, FD&C Red No. 40, lactose, magnesium stearate, povidone, and talc.

300 µg
Each green, round, colour-coded, scored tablet, debossed with "SYNTHROID" on one side and potency on the other side contains levothyroxine sodium, USP 300 µg. Nonmedicinal ingredients: acacia, confectioner's sugar, D&C Yellow No. 10, FD&C Blue No. 1, FD&C Yellow No. 6, lactose, magnesium stearate, povidone, and talc.

Who should NOT take Synthroid?

Levothyroxine should not be used by anyone who:

  • is allergic to levothyroxine or to any of the ingredients of the medication
  • is having a heart attack
  • has acute thyrotoxicosis (too much thyroid hormone in their system)
  • has uncorrected adrenal insufficiency

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