Colleen,

My brother-in-law was already on the plane headed home when I got your follow-up question. However, in addition to the links noted above, I found this link, which pretty clearly mentions the "empty stomach" requirement, as well as the potential interactions with other drugs and supplements.

http://www.medicinenet.com/levothyroxine-oral/article.htm

Cathy

Tongue SCC (T2M0N0), poorly differentiated, diagnosed 3/89, partial glossectomy and neck dissection 4/89, radiation from early June to late August 1989