Overview Safety, Tolerability and PK Study of Methylphenidate HCl ERCT in 4-5 Year Old Children With ADHD. Status: Withdrawn Trial end date: 2020-12-03 Target enrollment: Participant gender: Summary 2-week open-label safety, tolerability and pharmacokinetic study of methylphenidate HCl ERCT in 4-5 year old children with ADHD. Phase: Phase 4 Details Lead Sponsor: PfizerTreatments: Methylphenidate