As a person who has trifled with adding in 5mcg of Cytomel on 3 different times, I Can tell you this much.
First…run it past your doctor. Believe it or not, sometimes they are not aware that Liothyronine to Synthroid is a 1:5 ratio. I felt good very quickly. Then I casually moved on to hyper mode. For me, the heart palpatation symptoms, did not balance with the minute increase in feeling better mentally. I was very stubborn, and had a doctor that did humor me. Which is why I tried it 3 times over the past 9 years. The “me” today, will not try it again. Hyperthyroidism can waste away our muscle mass, and my heart is a muscle too.
(TT in 2010)