ABVC BioPharma, Inc. announced an update on the Company's eight-week long ADHD Phase II part II clinical study taking place at the University of California San Francisco (UCSF) Medical Center and five Taiwan medical centers. A total of 94 subjects were screened, out of which 69 enrolled in the study; 60 subjects completed the eight-week study. The study entitled "A Phase II Tolerability and Efficacy Study of PDC-1421 Treatment in Adult Patients With attention-Deficit Hyperactivity Disorder (ADHD), Part II" is a randomized, double-blind, placebo-controlled study involving a total of approximately 100 patients in the United States and Taiwan.

The Phase II part II clinical study continues the Phase II part I clinical study of ABV-1505. Phase II part I of the study successfully achieved the specified primary endpoints at UCSF and was accepted by the U.S. Food & Drug Administration in October 2020.