I just recently started taking Lithothyronine (T3). I lowered my Levothyroxine daily dosage from 125mcg to 100mcg and added the litho. For the first month I've been taking 10mcg of lithothyronine. For the past three weeks though, I've been increasingly more tired, so I upped my Litho to 20mcg per day as of last week. Still tired though... Any good explanations for this? Should I increase my T3 even more? My doctor's goal was to rid my body of the excess reverse T3 that I was building up by flooding it with the Litho which is active T3. Haven't gotten updated blood work for this yet.