I was on Synthroid for more than 17 years. The first symptom I had of a low thyroid was massive hair loss. My doctor prescribed Synthroid and since that time I had been taking some form of it (name brand or generic), adjusting the dose as needed (determined by the results of my TSH). I stopped losing my hair in massive amounts, but never really regrew the most obvious loss up top. I was able to convice by internist to switch me to Armour three months ago. While I don't think my dose of 1.5 grains is enough yet and my hair hasn't starting filling in, I'm not losing the amount of hair that I was on Synthroid. I, too, have read that hair loss can be a side effect of Synthroid and I'm really mad that it took me this long to figure it out. Anyway, I'll be seeing my internist later this month and hope to increase my Armour dose and see added improvement.

Patty