A member asked:

After levothyroxine is taken how long does it take to kick in?

A doctor has provided 1 answer

Depends: Hi. Levothyroxine (T4) takes about 5-6 weeks to get to equilibrium state in your blood. Biological effects may be felt sooner than that, of course, but in terms of lab testing after starting or changing a dose, you need to wait about 6 weeks to test when the dose is at equilibrium in the blood. T4 works by regulating gene expression; DNA to RNA to protein and the proteins affect tissue function

Answered 9/15/2017

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Related Questions

A member asked:

Should i be worried i didn't take my levothyroxine meds for 2 days?

A doctor has provided 1 answer