I got an underactive thyroid at 13 years of age i am now 20 my meds vary from every test they are always changing but never below 150mg is this normal?

Hypothyroidism: The levels of replacement hormone for patients with this condition is dependent upon the chemical assessment of the need for thyroid replacement, as measured by TSH levels and sometimes other values. These may change from time to time, but a good endocrinologist or pcp should be discussing the reasons for change with you. If they are not, perhaps you should seek alternative care.

Several problems can: Cause this easier to tell you how to prevent problem 1. Don't use armour thyoid 2. Do use brand name synthroid (thyroxine) 3. Always take synthroid (thyroxine) first thing in am 1 hour before eating or taking other medicine.