gwenhyffar: (Gwen)
[personal profile] gwenhyffar posting in [community profile] thyroid
http://www.hotthyroidology.com/editorial_195.html

ABSTRACT
Several drugs inhibit the intestinal absorption of levothyroxine (L-T4) when taken simultaneously with the thyroid hormone or shortly later. Recently, in a study on 8 women, coffee has been reported to reduce the intestinal absorption of L-T4, so that L-T4 was added to the list of the medications whose intestinal absorption is decreased by coffee. We report another six adult patients, 5 women and 1 man, aged 38 to 62 years, who were observed during the last 18 months. All patients were referred because of failure of serum TSH to be normalized or suppressed by appropriate replacement (1.6-1.8 μg/Kg b.w.) or TSH-suppressive (2.0-2.2 μg/Kg b.w.) therapy with L-T4. In each of the six patients, serum TSH failed to be normalized or suppressed if L-T4 was swallowed simultaneously with coffee (or followed by coffee soon after). Correction of this habit, by drinking coffee 60 minutes after having swallowed L-T4 with water, resulted in normalization or suppression of serum TSH.
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