Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Adult Laboratory Classroom Study of the Efficacy and Safety of PRC-063 (Extended-Release Methylphenidate) for the Treatment of ADHD

J Atten Disord. 2022 Apr;26(6):857-869. doi: 10.1177/10870547211025610. Epub 2021 Jun 30.


Objective: To evaluate the efficacy, safety, and duration of action of the once-daily extended-release methylphenidate formulation PRC-063 for the treatment of ADHD in an adult laboratory classroom (ALC).

Method: After dose optimization with PRC-063 over 7 weeks, adults with ADHD were randomized to 1 week of double-blind treatment with PRC-063 or placebo that ended with an ALC evaluation. The primary outcome measure was Permanent Product Measure of Performance-Total (PERMP-T) score.

Results: Of 288 subjects enrolled, 221 completed the ALC visit. PERMP-T score was significantly higher for PRC-063 versus placebo at every assessment from 1 to 16 hours post-dose at the ALC visit and when averaged over 16 hours post-dose (least-squares mean difference 16.3, 95% confidence interval 7.6-24.9). The most frequent adverse events during dose optimization were headache, decreased appetite, and insomnia.

Conclusion: PRC-063 provided rapid and sustained symptom relief in adults with ADHD and was well tolerated. NCT03618030.

Keywords: ALC environment; adult ADHD; efficacy; methylphenidate; safety; sustained and long-lasting stimulant.

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Attention Deficit Disorder with Hyperactivity* / chemically induced
  • Attention Deficit Disorder with Hyperactivity* / drug therapy
  • Central Nervous System Stimulants* / adverse effects
  • Delayed-Action Preparations / adverse effects
  • Dose-Response Relationship, Drug
  • Double-Blind Method
  • Humans
  • Methylphenidate* / adverse effects
  • Treatment Outcome


  • Central Nervous System Stimulants
  • Delayed-Action Preparations
  • Methylphenidate

Associated data

  • ClinicalTrials.gov/NCT03618030