My son also had significant nightmares on Intuniv and we had to stop using it. He did well on Guanfacine without that side effect though. Guanfacine is the generic, short-acting, original form. Talk with the prescribing doctor about this.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism