A novel formulation of l-thyroxine (l-T4) reduces the problem of l-T4 malabsorption by coffee observed with traditional tablet formulations

The purpose of this work is to evaluate if the coffee-associated malabsorption of tablet levothyroxine (l-T4) is reduced by soft gel capsule. We recruited 8 patients with coffee-associated l-T4 malabsorption including one hypothyroid patient. For 6 months, the patients were switched to the capsule maintaining the l-T4 daily dose. Patients took the capsule with water, having coffee 1 h later (proper habit, PH) on days 1–90, or with coffee ≤5 min...