The study will compare the efficacy, safety and tolerability of twice daily Chronocort with twice daily immediate release hydrocortisone replacement therapy (IRHC) (Cortef®) over a randomized treatment period of up to 52 weeks in participants aged 16 years and over with known classic Congenital Adrenal Hyperplasia (CAH) due to 21 hydroxylase deficiency. The primary efficacy assessment of biochemical responder rate and the key secondary assessment of dose responder rate will be assessed after 52 weeks of randomized treatment.
This study is a randomized, double-blind, active-controlled, phase III study of Chronocort® compared with immediate-release hydrocortisone replacement therapy in participants aged 16 years and over with Congenital Adrenal Hyperplasia.