[rhombocombus]

In a manager/report relationship I think it is inappropriate, but I had a colleague suggest I begin taking ADHD medication in grad school and it changed my life. Without knowing your relationship with your manager I can't speak to the appropriateness other than to say you shouldn't bring that up, but I have had very close relationships with some of my managers where I might have approached that level of honesty/vulnerability to make them feel like that was appropriate.

All of that aside, your manager is not a physician and you are free to ignore anything they say regarding your health. I would still reflect on why they might have said that and whether you are struggling in your role.