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If you are taking thyroid pills- levothyroxine, NP Thyroid, armour, cytomel...The direct  T3 portion will increase in a matter of days and come down in a matter of days due to short half life. The T4 will take up to a month or maybe longer due to longer half life. A portion of the T4 will convert to T3 so that amount will take same to respond. Your TSH will follow both of those. So any effect from T3 will be quick and any effect from T4 will take longer.