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altec here is a good post by one of our moderators the great Vince that covers a lot of ground on T4 and T3 dosing.  They are the only 2 thyroid hormones actually active with T3 being the most important.  I would read the post end to end and dig deeper into other posters with website references. 

I've learned a lot about the thyroid since finding out my Reverse T3 was too high back in March.  This was caused by frequent blood donations which lowered my ferritin and iron levels. 

A very good thyroid section here at ExcelMale which is why it is one of the top men's health forums around!

https://www.excelmale.com/forum/showthread.php?14381-can-cytomel-by-itself-be-used-to-treat-hypothyroidism

Defy is the one who caught this for me and prescribed T3 only cytomel to lower my RT3 and raise my T3.  Been on 20 mcg day since March and feeling a lot lot better.  Trust Defy.  They know how to manage thyroid and low T.