Thyroxine is a hormone secreted by the thyroid (hence the name) gland in the neck.
The medication you are talking about is merely a man-made form of this natural hormone. In this aspect, it can hardly be called a medication, just like insulin is a man-made type of a natural hormone available in the human body. Personally I would call it a "hormone supplement" rather than medication.
Various brands produce this hormone supplement under different names. One that is commonly known is "L-Thyroxine" of Sanofi Aventis.
As long as you are diagnosed with hypo-thyroidism and as long as you use it in full accordance with your doctor's prescription, it is totally safe to use.
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