There are two types of stimulants: amphetamine (Adderall, Vyvanse, Evekeo…) and methylphenidate (Ritalin, Concerta, Quillivant…). Almost everyone does well on one type or the other, but not both. Talk to the doctor about trying a methylphenidate next (sounds like you maybe have if Quillivant is the next medication to try).
Definitely refrain from all citric acids within 1-2 hours of taking ADHD medication.
Here’s a lot more detail on ADHD medication:
You may consider genetic abnormalities (like MTHFR) and food sensitivities as the potential culprit for medication failure if you have the same experience with methylphenidates.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism