Thyroxine (which we call T4), is a thyroid hormone which is secreted by the thyroid gland.  T4 is then converted to its stronger active metabolite, triiodothyronine (which we call T3).   The thyroid hormones bind to receptors and exert their metabolic effects, which include helping maintain normal growth & development, utilization of stored sugars, protein synthesis and metabolism. 

T3 hormone is approximately 4 times more potent than T4 hormone and the body does its best to maintain an appropriate balance circulating in your blood system at all times.  Maintaining an appropriate thyroid level is important for maintaing normal mental and physical function.  In children, maintaing a normal thyroid level is vital for mental and physical growth. 

Symptoms of low thyroid level may include a slow heartbeat, tiredness, muscle aches, weight gain, dry skin or sensitivity to cold.  If you experience any of these symptoms on a regular basis, please contact your doctor and let them know. 

Thyroid replacement hormone is used to treat an under active thyroid (hypothyroidism). This therapy will provide additional thyroid hormone if the thyroid is only partially working, or it will replace the thyroid hormone if they thyroid is completely shut down.  The thyroid may decrease in its function naturally over time, or it may become damaged through injury, certain medications, radiation therapy or certain types of disease conditions.

To learn about the medications used to treat hypothyroid disorders, pleasesupport AudibleRxTM by becoming a member, and then have full access to all of the Medication Specific Counseling SessionsTM.

  • Levothyroxine (synthetic T4) (Levothroid-TM, Levoxyl-TM, Synthroid-TM, others)
  • Liothyronine (synthetic T3) (Cytomel-TM)
  • Thyroid (natural thyroid from pigs) (Armour Thyroid-TM, Nature Throid-TM, others)


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