I have been taking Thyroid-S for over a year, after finding that neither Armour nor Erfa worked optimally for me (I was first put on Armour, then on Erfa after it allegedly changed somehow, too).
On Thyroid-S, I feel stable, the way I guess you are supposed to feel when on NDT (or any other thyroid drug, for that matter). On Armour, I felt slightly under medicated regardless of dose and, on Erfa, it was constantly up and down.
My labs eight months ago (on Thyroid-S) looked like follows: TSH <0.01 mUI/L (0.35-4.5), FT4 0.8 ng/dL (0.7-1.5), FT3 2.9 pg/mL (1.7-3.7). I take Thyroid-S once a day, in the morning, and always go to the lab 24 h after taking it.
Although I felt good, I suspected maybe my FT4 levels were suboptimal, so I added another grain daily. I just got my latest lab results back:
TSH <0.01, FT4 1.2 (0.7-1.5), FT3 4.6 (1.7-3.7). So FT4 midrange, and FT3 levels out of range, 24 h after taking the pills.
I am not sure how 1 more grain of NDT (=9 mcg of T3) can make such a difference when it comes to FT3 levels 24 h after taking NDT? I have always been a poor converter, so I am not sure the higher FT4 levels have anything to do with it.
I cannot say I feel overmedicated, but I guess I should reduce my current dose to bring my FT3 levels in range (since they were out of range 24 h after taking any meds, I guess they were ca 20% higher on the day before?) This should also mean that, eight months ago, when my FT3 levels were midrange 24 h after taking Thyroid-S, they were about 20% higher 24 h earlier, so around 3.2 (ref 1.7-3.7)?
I have been considering trying another brand of Thai NDT, but I am not sure I should give up on Thyroid-S if I feel good on it? Another idea would be to add half a grain daily to see if I can get my FT3 levels up slightly...not sure how much FT4 levels matter on NDT?
I seem unable to get my FT4 midrange and keep my FT3 levels in range at all times, at least on Thyroid-S, but wonder if there is such a thing as "ideal free Ts" when on NDT?