Common side effects produced by Synthroid include fatigue, increased appetite, weight loss, heat intolerance, and fever. Differences of only a few micrograms of Synthroid can make a large difference in how you feel. Synthroid should be used only by the patient for whom it is prescribed. If you take Synthroid with an appetite-suppressant medication. It may take a few weeks for Synthroid to begin working, and you may not see any change in your symptoms until then. If your thyroid production is low.
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