Roughly, based on my and other friends with ADHD medication compared to friends that I can't confirm or deny might have sampled from our prescriptions.

Ritalin with ADHD: You get tired a.f. to the point of doubting if you got correct medication, because it was supposed to be stimulant but then you realise, that despite the feeling, you can actually just do stuff. You feel calm. You might experience the previously unfathomable "I hate doing this, but it needs to be done, so I might as well", without needing the stars to align, you just do it. After few hours this stops and you actually need to go lay down. Then you spent several months with your doctor getting the dose right, because needing to lie down after 4 hours is annoying

Ritalin without ADHD: Feels like super-coffee: more energy, more optimism. But not more focus. Actually, maybe less focus? Might help you zoom around your house doing chores, but not really tackling any sort of deep thinking work.

This matches experience of some acquaintance that went to a party, and might have sampled certain crystals, got quiet and tired while and while others were happy and energetic.

For both - dosage is tricky, and it is easy to get you to spiral into anxiety. Also, it is not good for your heart.