Whenever I take synthetic hormone replacement, I develop hair loss. After reading a new endocrinology text recently, I decided to change briefly from Armour Thyroid to Synthroid + Cytomel, and have regretted it ever since. (Synthroid = levothyroxine = Levoxyl) I felt horrible with the change in medication and started losing large amounts of hair almost immediately. Three weeks back on my previous Armour Thyroid dose and my mood and energy are nearly back to normal, but my hair loss continues... I am hopeful that it will taper off.