120 mg of Armour to BEGIN with, especially with a heart patient is extremely high. The usual starting dose is 30 mg
Armour Thyroid, for cardiovascular patients, with additional
Armour being added at 15 mg every two to three weeks, which depends on your thyroid hormone levels. I'm a bit surprised that the physicians assistant started you on such a high dosage, usually a GP will refer a person with abnormal thyroid levels to an endocrinologist first.