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Pharmacokinetics of hydroxyurea 1,000 mg coated breakable tablets and 500 mg capsules in pediatric and adult patients with sickle cell disease.

Little is known about the pharmacokinetics of hydroxyurea in patients with sickle cell disease (SCD). Our aims were to evaluate bioequivalence between standard hydroxyurea capsules and a new formulation of 1,000 mg coated breakable tablets in adults and to compare pharmacokinetic parameters in adults and children with SCD. Fifteen adults received hydroxyurea capsules and tablets in a randomized cross-over study. Eleven children received hydroxyurea tablets. The results showed bioequivalence between capsules and tablets in adults. Pharmacokinetic parameters were not significantly different between adults and children. Considerable inter-individual variability was noted.