- RxList: Levothyroxine
 - Clinical notes on the hypothyroidism treatment including pharmacology, dosages, side effects, and warnings. - FAQ - Synthroid
- Levoxyl (Levothyroxine Sodium)
- Official site from Jones Pharma for the thyroid hormone replacement or supplemental therapy for hypothyroidism.
- Synthroid Marketing Litigation
- Unithroid (Levothyroxine Sodium)
- Prescribing and product information Unithroid, the medication for treating hypothyroidism and thyroid problems such as goiters, nodules, cancer, and Hashimoto's thyroiditis. From Jerome Stevens Pharmaceuticals.
- About.com: Synthroid
- Collection of articles on levothyroxine thyroid hormone replacement drugs such as Synthroid and its equivalents, Levoxyl, Levothyroid, Unithroid, Armour, Thyrolar, and Cytomel.
- Synthroid (Levothyroxine Sodium)
- Offers information about Synthroid (Levothyroxine Sodium Tablets, USP) for the treatment of hypothyroidism.
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