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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Dosage Of Synthroid To Be Given For Hyperthyroidism In A Thyroid Cancer Survivor?

I m a thyroid cancer survivor of 17 years. Currently on 224mcg Synthroid daily. Dr called and said my tsh was 0.002 and that my doseage was too high and that I am hyperthyroid. They re dropping me to 150mcg for appx 6 weeks, and will adjust from there. Does this sound alright?
Thu, 22 Jun 2017
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Internal Medicine Specialist,  's  Response
Hello,

the full dosage for thyroxine replacement treatment is 1.7mcg per kilogram per day. 150mcg should be fine for someone whose weight is 88Kgr. 224 would sound too high for the same individual. Keep in mind though that besides this general "rule" the dosage is individualized. Measuring TSH levels after 6 weeks is required to check whether the dosage is right or not.

So in conclusion, your doctor's recommendation sounds OK if your weight is close to 88Kgr. Since your TSH was so low, serious reduction in dosage was required anyway. In any case the ideal dosage can be found with trial and error...

I hope it helps!
Kind Regards!
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What Dosage Of Synthroid To Be Given For Hyperthyroidism In A Thyroid Cancer Survivor?

Hello, the full dosage for thyroxine replacement treatment is 1.7mcg per kilogram per day. 150mcg should be fine for someone whose weight is 88Kgr. 224 would sound too high for the same individual. Keep in mind though that besides this general rule the dosage is individualized. Measuring TSH levels after 6 weeks is required to check whether the dosage is right or not. So in conclusion, your doctor s recommendation sounds OK if your weight is close to 88Kgr. Since your TSH was so low, serious reduction in dosage was required anyway. In any case the ideal dosage can be found with trial and error... I hope it helps! Kind Regards!