Doesn't look like it should be used, by itself, for both.
"PRESCRIBED FOR:
Levothyroxine is approved to treat hypothyroidism and to suppress
thyroid hormone release in the management of cancerous thyroid nodules and growth of goiters. In addition,
Synthroid,
Levoxyl and Levothroid also are prescribed with anti-thyroid drugs, for example methimazole (Tapazole), to manage thyrotoxicosis (high thyroid hormone levels due to over-activity of the thyroid gland). Thyrotoxicosis may result in the growth of goiters and/or hypothyroidism. "
Here's the information page:
http://www.medicinenet.com/levothyro...um/article.htm verwon@gmail.com
My information is not guaranteed correct. I do not get them right all the time, but I do enjoy the hunt~