Besides the drugged feeling, I would get a bad headache, warm burning skin (mostly across my face), mild nausea
, and diarrhea. My MD switched me to Synthroid and all of the side effects
stopped except the drugged feeling, that eventually stopped about 4 weeks later. Now I have no problem taking Synthroid, no more drugged feeling. I started on 25mcg and slowly increased the dosage to 50 mcg.