medication, Thyroid Medication

What is Levothyroxine

It is a synthetic thyroid hormone used to replace or supplement thyroid hormone levels in the body.

You may also see it referred to as L-thyroxine and levothyroxine sodium.

In the United States it is sold under the following brand names: Levothroid®, Levoxyl®,  Synthroid® and Unithroid®.

In Canada you will find it sold as: Eltroxin®, Euthyrox, Levothyroxine Sodium and Synthroid®.


Your Doctor will determine the correct dose based on a blood test.  They may test your blood periodically to ensure you are getting the proper dose.

You may see the dose reported in milligrams (mg) or micrograms (mcg).

Levothyroxine is available in the following doses:

  • 0.0.25mg/25mcg tablets
  • 0.05mg/50mcg tablets
  • 0.075mg/75mcg tablets
  • 0.088mg/88mcg tablets
  • 0.1mg/100mcg tablets
  • 0.112mg/112mcg tablets
  • 0.125mg/125mcg tablets
  • 0.137mg/137mcg tablets
  • 0.15mg/150mcg tablets
  • 0.175mg/175mcg tablets
  • 0.2mg/200mcg tablets
  • 0.3mg/300mcg tablets

Side Effects

May include racing heart, unusual heart rhythms, chest pain, heart attack, tremors, headache, anxiety/nervousness, trouble sleeping, sweating and weight lose.

The chance of side effect goes up as your dose goes up.

Always talk to your Doctor if you feel you are experiencing side effects.


If you are prescribed this medication it is important to know how to take levothyroxine.  I often tell people in the pharmacy to think of the medication as being sticky.  It will stick to any thing else in the stomach and the body won’t absorb it as well.

Always take it on an empty stomach, that means no vitamins, no other pills, not even coffee.  Just the thyroid tablet and water.

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The pharmaceutical information on this site is provided as an information resource only, and is not to be used or relied on for any diagnostic or treatment purposes. This information is not intended to be patient education and should not be used as a substitute for professional diagnosis and treatment.
2 comments… add one
  • Yes, it could be. He should contact his doctor and determine if he is taking the correct dose of levothyroxine.

  • marie gahary Link

    my husband is taking LEVOTHYROXINE 0.112MG (112MCG) tabs for underactive thyroid it seems his blood pressure goes up to the range of 160 to 175 or higher at times also takes 25 MG of metoprolol 3 times a day to control his pressure it is still very high please let me know if this a side effect

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