s almost unheard of
for hypothyroidism, except in a very few circumstances... Protocol calls
for, at least a combination of a T4 medication, such as some form of levthyroxine (there are different brands, depending on your location).
In addition, 37.5 mcg of cytomel is a very large dose and very few people ever need that much... if you were taking a T4 medication with it, presumably, you'd be converting some of the T4 to T3, as well.
Also, are you taking the whole 37.