The meds need lots of fluids to work optimally, so being sure you drink lots of water consistently could help. Ask your doctor of pharmacist if the GERD medication could be impacting the efficacy of the Vyvanse. It’s possible.
You want to avoid citric acid within 2 hours of taking stimulants as well. That means no citrus, no OJ, and no soda.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism