Free T3 levels must be checked regularly, along with TSH
and Free T4, when
taking cytomel.
Cytomel is usually not recommended unless you have a conversion problem or for some other reason, your Free T3 is out of line. In addition, you should constantly be aware of any symptoms that might indicate that you are taking too much.
Oldie - I, too, have heard that cytomel should not be used by persons with heart issues.