Abstract
The pharmacokinetics of propylthiouracil (PTU) was studied in 7 patients having Graves' disease when they were hyperthyroid and then again when they were euthyroid. Two additional euthyroid patients were also studied. The t1/2, Ke, Ka, apparent Vd, AUC and clearance were calculated. Serum T3 and T4 were also measured. PTU had an immediate effect in reducing T3 levels. Although there were intraindividual variations, the mean PTU elimination half-time did not change from the hyperthyroid state (1.47 h) to the euthyroid state (1.53 h). The mean Ka when hyperthyroid (2.12 h-1) was significantly increased (p less than 0.005) compared to when euthyroid (1.00 h-1). The calculated kinetic information indicates that the disposition of PTU in children is similar to that reported in adults.
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