Levothyroxine (Cont.)

Levothyroxine Drug Interactions

Levothyroxine can potentially interact with several other medications, including non-prescription products (see Drug Interactions With Levothyroxine).
 

What If I Take an Overdose of Levothyroxine?

People who take too much levothyroxine may have overdose symptoms that can include:
 
(Click Levothyroxine Overdose for more information.)
 

What Should I Do If I Miss a Dose of Levothyroxine?

If you forget to take your levothyroxine dose, take your missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose of the medication. Each time you get your blood tests to monitor your thyroid function, be sure to tell your healthcare provider if you have missed any doses, as this may affect any dose adjustments.
 

Levothyroxine Strengths

Levothyroxine tablets come in the following strengths:
 
  • Levothyroxine 25 mcg
  • Levothyroxine 50 mcg
  • Levothyroxine 75 mcg
  • Levothyroxine 88 mcg
  • Levothyroxine 100 mcg
  • Levothyroxine 112 mcg
  • Levothyroxine 125 mcg
  • Levothyroxine 137 mcg
  • Levothyroxine 150 mcg
  • Levothyroxine 175 mcg
  • Levothyroxine 200 mcg
  • Levothyroxine 300 mcg.
     
Sometimes, the strengths of levothyroxine are given in milligrams (mg) instead of micrograms (mcg), which can be confusing. Because there are 1000 mcg in every mg, levothyroxine 100 mcg is the same thing as levothyroxine 0.1 mg.
 
(Levothyroxine Continued: Page 5)
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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;