Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
The cause of the interaction is unknown.
What might happen:
You may experience symptoms from a decreased function of your thyroid gland.
What you should do about this interaction:
If you experience unusual tiredness, constipation, increased sensitivity to cold temperature, muscle stiffness, weight gain, and for women, changes in menstrual periods, call your doctor. Your healthcare professionals (e.g. doctor or pharmacist) may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
1.Wiener JD. Lithium carbonate-induced myxedema. JAMA 1972 Apr 24; 220(4):587.
2.Jorgensen JV, Brandrup F, Schroll M. Possible synergism between iodine and lithium carbonate. JAMA 1973 Jan 8;223(2):192-3.