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Why Increase in Levothyroxine Medication?
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by Ami1801, Jan 17, 2012
I recently had my thyroid levels checked and my TSH was low - .238. Therefore, my doctor increase the levothyroxine dosage to 150 mcg ( I was taking 75 mcg). I am confused by this. If my TCH is low, should I not have been placed on a lower dosage of the levothyroxine?

Also, I have been trying to get pregnant for the past year and am wondering if I am having fertility issues b/c of my thyroid issues. I also have low progesterone. Is there any hope for me to become a mother again?
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Member Comments (8)
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by goolarra, Jan 17, 2012
Yes, usually, if your TSH is too low and you feel hyper, a reduction in meds is indicated.  Sometimes, after thyroid cancer, doctors like to keep TSH below 0.1 to lessen the chance of recurrence.  

TSH is very unreliable as an indicator of thyroid status.  Is your doctor also checking your free T3 and free T4?  How do you feel.

An increase from 75 mcg to 150 mcg is a huge increase.  Changes of 25 mcg at a time are much more common.

Is this a new doctor?  Has he been a reliable thyroid doctor in the past?
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by Ami1801, Jan 17, 2012
Yes, this is a new doctor. Then are you saying the doctor was wrong in increasing my thyroid medication?
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by Ami1801, Jan 17, 2012
The doctor made a mistake - imagine that. The presciption should have been a decrease in my medication to 50 mcg. This is a HUGE mistake and I am definitely switching to a new doctor!
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by goolarra, Jan 17, 2012
They are human...

However, I'm still concerned about how you feel.  Are you feeling hyper?  Many times, once on meds, TSH becomes a very unreliable indicator.  Doctors often reduce meds based on suppressed TSH making their patients hypo once again.

I was quite sure an increase from 75 to 150 was a mistake, but I'm not convinced that your meds need to be lowered, either.  It all depends on whether you are having symptoms or not.
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by Barb135Blank, Jan 17, 2012
Yay for you -- am so glad you questioned this...... but do make sure your next doctor tests the Free T3 and Free T4, which are the actual thyroid hormones....... don't ever let a doctor dose you by TSH alone.......
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by CAppleD, Jan 17, 2012
I hope you're seeing an experienced endocrinologist now. And make sure you're prescribed the brand name 'Synthroid' of Levothyroxine, because the generic can be different doses from refill-to-refill (ask a good Endo, they will certainly agree)
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by Barb135Blank, Jan 18, 2012
Synthroid is not always the best choice.  I was started out on Synthroid, because my pcp, at the time, thought the same way you do;  even with steady increases in dosage, I did not improve.  Once switched over to generic levo, my FT3 and FT4 levels began coming up and I did much better. I did not find that the doses were "different" from refill to refill.

Everyone reacts differently, so it can be a bit of an "experiment" to find the right medication.

Not all endocrinologists are experienced with thyroid care, as many specialize in diabetes.  As with finding any type of doctor, care must be taken, as not all good thyroid doctors are endos.
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by sue4q, Mar 30, 2013
I would not let my doctor increase me that much way too much of an increase if you were at 75mcg  I would let him do raise me any higher than 100mcg I started at 75 and my first  increase with 100. had hypo thyroid  since 98 I know what I'm talking. increasing  medication too much can turn into hyper thyroid. have a very dangerous thing called a thyroid  storm. sounds like you need a different doctor. a lot of doctors are really educated on thyroid the doctor who knows about thyroid the best is an endrocronoligist. I finally went to 1 of these doctors years ago and also did a lot of my own research and this is how found out about the medications. can I always tell when mine is out of whack before I even have a blood test done. my nails get weak and break and chip. and.peel my hair falls out excessivly when I wash hair.feel sluggish. I get more irritable.some people get cold easy. if you're not having any symptoms I certainly would not let him/her  raise me edpecially that much of a increase. maybe you should have the test repeated if you're not having symptoms labs do make mistakes.good luck.