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.
It likely won’t help, though it depends on the source of the brain fog. ADHD drugs are aimed particularly at the areas of the brain associated with executive functioning. Under stimulation here can cause brain fog, among other symptoms. Critically, the body’s homeostasis system wants to boost things, but can’t. It doesn’t fight the boost from the drugs, at least in the under stimulated areas.
If the brain fog is sourced elsewhere in the brain then the amphetamines won’t help much. Even worse, a normal Brian will adapt to counter the drugs effect, causing physical addiction. You would need to constantly increase the dose to gain the same effect. That’s the reason ADHD drugs are controlled substances in most countries. People chase the dragon, and end up nuking their brain with too high a dose.
Basically, don’t do it without medical oversight.