Question: I am 71 now and on Synthroid for 35 years. Can I switch back to Armour Thyroid after taking Synthroid for so many years?

Dr. Brownstein's Answer:

Yes, you can switch from one thyroid medication to another. My experience has shown that each patient has a unique biochemical individuality (as Roger Williams wrote about over 50 years ago). Some people do well with natural, desiccated thyroid which contains both T4 and T3 plus other factors. On the other hand, others may do better with T4 preparations such as Synthroid or Levothroid.

Having said that, my experience has shown that for the vast majority of people, desiccated thyroid is a better choice. It provides not only T3, but in addition T2, T1, calcitonin, selenium and other factors that provide the body with the correct ingredients that it needs to ensure optimal thyroid functioning. As a general rule, 50 micrograms (ug) of Synthroid is equivalent to approximately 1 grain of desiccated (Armour) thyroid. Therefore, 0.1 mg of Synthroid would equate to approximately 2 grains of desiccated thyroid. Keep in mind that desiccated thyroid is much more active than Synthroid. You may need lower doses. Nature-Throid is another desiccated thyroid medication that should also be considered, especially for those with autoimmune thyroid illness.