We license doctors you visit to practice medicine, not to do research. Unless they're working at a dedicated research hospital like the Mayo clinic, doctors don't do research on their own.

They'll stay up to date with what is standards of care, but even that is dictated to them by their EHR software or what they expect your insurance will cover.

When I've gotten prescribed a new medicine, I don't really recall a doctor ever even telling me what side effects to watch out for. At most, they've told me not to drink alcohol while on someone.