[zrm]

Ritalin is a chemical relative of amphetamine. In prescribed amounts it's often an effective treatment. In recreational amounts, ask your doctor about ΔFosB:

https://en.wikipedia.org/wiki/FOSB#DeltaFosB

[dotancohen]

I was unaware that Ritalin is used as a recreational drug.

[PaulHoule]

It's a drug that is often diverted by people who have a prescription in order to make money.