My first thought is that the new doctor either doesn’t believe ADHD affects adults (unlikely since she’s offering a different medication), OR, more likely, she’s worried about “older” adults taking stimulant medication, because of possible cardiac side effects.
Bupropion is often prescribed off-label for ADHD, usually when a patient can’t tolerate stimulants or receives no benefit for stimulants. It does help some people with ADHD symptoms.
An all-clear after cardiac testing might persuade her to allow you to continue Concerta. Some doctors are more focused on this than others. An ADHD specialist for medication management may be better for you.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism