I was on Armour, then one day my doctor said that he wanted to change me to Synthroid because Armour was not consistent in dosage
and Synthroid was better. So, I changed. Started gaining weight, eventually started experiencing heart palpatations, thin and cracking nails (which I began to peal and tear at because I was so shaky), hair falling out, and left temple pain, and a severe twitch in my left eyelid, shaky hands. BTW another doc had me taking potassium iodide also for three months.