My friend has very bad brain fog from a physical condition. It’s so bad she often pauses when she speaks like a YouTube video trying to buffer on a bad internet connection and she told me she wants to be more like her former self. She’s on medication for the condition, but the brain fog is one symptom that persists. She wants some good insight on how effective amphetamines are for brain fog in the non-ADHD population. She could only find people who have both ADHD and brain fog which could skew things. She doesn’t have ADHD, just brain fog.
Not a doctor, but based on research I’ve seent brain fog (in likely many cases) seems to be due to inflammation. https://www.autoimmuneinstitute.org/covid_timeline/brain-fog-likely-caused-by-brain-inflammation-its-not-just-all-in-their-head/
Have your friend try inflammation-reducing drugs like metformin. Metformin specifically, maybe there’s others, I’m sadly not a doctor. Metformin is a magic drug that’s not just for diabetius.
It won’t be immediate, but maybe it could help your friend recover. Idk if cranking yourself will break through when it’s a blocking mechanism causing the problem.