i used to take ritalin when i was a kid.
First time I tried weed i freaked out real bad. It was most likely a bad reaction between both substances - weed, a depressant, and ritalin, which has the same chemical structure as the stimulant Speed. Since ritalin does have bad effects on mental and physical health (lack of sleep, loss of appetite, mental dependance), I would definitely recommend weed over that shit. Just stay away from weed if ur taking a strong dose of ritalin.