Clinical Trials

Neurocrine Biosciences completed a Phase II study evaluating the safety, tolerability, pharmacokinetics and pharmacodynamics of crinecerfont in adult patients with classic congenital adrenal hyperplasia (CAH). The final results from this open-label, multiple-dose, dose-escalation study were reported in June 2020.

Neurocrine Biosciences is currently enrolling patients in global registrational studies of crinecerfont in adult (18 years and older) and pediatric (2 years to 17 years) patients with classic CAH. For more information about these two Phase III clinical studies of crinecerfont, please visit or for the adult study, and or for the pediatric study.

Neurocrine Biosciences is conducting KINECT-HD, a multi-center randomized, double-blind, placebo-controlled Phase III study to evaluate the efficacy, safety and tolerability of valbenazine for the treatment of chorea in patients with Huntington disease (HD). HD is a hereditary progressive neurodegenerative disorder, in which many patients may experience chorea, a troublesome involuntary movement disorder. For more information on this Phase III study of valbenazine for the treatment of chorea associated with HD, please visit or

Neurocrine Biosciences is conducting a Phase II, randomized, double-blind placebo-controlled, crossover study to assess the safety, tolerability, pharmacokinetics and efficacy of NBI-827104 in adult patients with essential tremor in the Netherlands. For more information about this Phase II study of NBI-827104, please visit

Neurocrine Biosciences intends to initiate a Phase II study of NBI-921352 in patients with SCN8A Developmental and Epileptic Encephalopathy Syndrome (SCN8A-DEE) in the second half of 2021. For more information about the intended study, please visit

Policy on expanded access to investigational medicines

Individuals interested in participating in clinical trials for Neurocrine Biosciences’ products may visit the “Pipeline” section of the website for information on ongoing clinical trials. At this time, Neurocrine Biosciences does not have an expanded access program that allows patients to have access to the Company’s investigational products prior to FDA approval. Neurocrine Biosciences will update this page as the Company grows and reassesses the approach to expanded access programs. If you have any questions, please contact