medications affecting thyroid

[tiredpoet]

I recently read something about amphetamines having an effect on thyroid tests.  I have been put on Adderall (adderrall) to counter extremely bad fatigue/weakness and brain fog that I have long suspected to be thyroid related. (I also have intolerance to cold - and my fingers get so cold, even when the weather is not that cold, that they feel stiff and like I have hardly and control over them, dry skin, water retention with extreme swelling of ankles and feet, constipation, and thinning hair.  My TSH levels have been "normal," but could the daily use of Adderall (adderrall) have an effect on this?  I read that amphetamine use can cause a decrease in TSH.  Since being on Adderall (adderrall) my TSH levels have been tested 3 times and have been consistently lower each time.  

Is it possible the medication I take to counter my symptoms could be somehow masking the real underlying cause of the symptoms?  

[laura1967]

This is another great question for a pharmacist and your doctor.....they are suppose to know the side effects of medications, and the affects on your body.
TSH is only a pituitary function test. The actual tests to show the active thyroid hormone levels in the body would be the Free T4 and Free T3.
Your symptoms sure do sound like thyroid.  I would suggest that you have blood tests for autoimmune thyroid disease. Symptoms can come long before levels show.