A great number of factors can interfere with levothyroxine (LT4) tablet absorption, leading to increased serum thyroid-stimulating hormone (TSH) levels and, accordingly, to increased LT4 requirements. LT4 oral solution (LT4-OS) is a novel formulation with a pharmacokinetics profile different from those of tablets. The aim of this study was to retrospectively evaluate whether serum TSH levels were decreased after switching adult hypothyroid patients from the tablet to LT-OS.
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From http://aace.metapress.com/content/23125883g7hn2713/?p=8bbc40c8b0d04a10878a7991431c6210&pi=4