Natural Health Research

Naturopathic Medicine
Health Quizzes
Levothyroxin, Synthroid, Levoid, Levothroid, Levoxine, Levoxyl


Levothyroxin is a synthetic, levoisomer of thyroxine (T4).


synthetic, levoisomer of thyroxine (T4)



Side Effects

alopecia, amenorrhea, angina, anorexia, atrial fibrillation, diaphoresis, diarrhea, fever, headache, heart failure, heat intolerance, hyperthyroidism, insomnia, irritability, menstrual irregularity, nausea/vomiting, palpitations, sinus tachycardia, tremor, weight loss

Drug-Vitamin-Herb Interactions

Negative interactions:

Calcium carbonate
Calcium carbonate interferes with absorption of thyroid hormone. Take separately.

Iron may impair effectiveness of levothyroxine possibly by binding to it. Take separately.

Soy may directly interfere with thyroid function.




Fantastic new books!

CAM Therapies has studies on natural therapies for over 100 diseases.

CAM Labs lists lab tests for 100 diseases.

Nutritional Genetics is a fantastic resource.



Information on this site is provided for informational purposes only and is not meant to substitute for the advice provided by your own physician or other medical professional. You should not use the information contained herein for diagnosing or treating a health problem or disease, or prescribing any medication. If you have or suspect that you have a medical problem, promptly contact your health care provider. Information and statements on this site have not been evaluated by the Food and Drug Administration.