ritalin and concerta, although the above poster is right. Adderal is meth based. I was horribly addicted to it for about a year, lost 65 pounds before i realised it was time to stop. Eventually it will put you into complete mental breakdowns if abused. I had so many great times, but a lot more horrible times. Staying up 3+ days is terrible for your health, i slept like two nights a week and it would only be for a few hours. Concerta and ritalin are nothing compared to adderal though, they will make you feel like shit.
just be careful.