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I have ADHD; getting Concerta here is near impossible, so I've been using Modafinil. It's been extremely effective.

That’s incredible. Unlike adhd meds, modafinil is neither addictive nor neuro toxic.

I've anecdotally found modafinil to be great for focus if I didn't sleep the night before, makes the day less miserable. Never tried it casually.

It is, however, extremely useful to treat narcolepsy.

That hasn't been my experience of it.

I use it only rarely, maybe once every 3-4 weeks when I'm feeling particularly fatigued but must deliver. I always find it really beneficial, and often find myself in a flow state - which, now in my 40s, happens very rarely these days.

I wrote some terrible code on modafanil but I did write it for 6 hours straight.

That's called a work day.

But I normally go to the bathroom and eat lunch during a work day.