A member asked:

How long before an increase in synthroid (thyroxine) from 5 tabs of 25 mcg to 8 tabs each week takes full effect for hypothyroidism treatment?

2 doctors weighed in across 2 answers
Dr. Douglas Fronzaglia ii, do, ms answered

Specializes in Internal Medicine - Geriatrics

Few weeks: It will take a few weeks to have a the full effect of a dose change of your synthroid (thyroxine).

Answered 12/20/2012

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Dr. Brian Chou answered

Specializes in

6 weeks: Synthroid or levothyroxine does not have to be titrated like that as the half-life is 1 week and thus steady state typically takes 4-6 weeks to obtain. Generally, the most appropriate dose should be started and adjusted every 6-8 weeks according to bloodwork. A good estimate is 1.6 mcg/kg as a start.

Answered 11/11/2018

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