You have to be more specific on what "blues" meant, normally that is what 30mg oxycodone is referred to. To answer your question, taking a cns stimulant, combined with a cns depressant, can be dangerous, but they most likely will counter one anothers effects, as stated above, save the benzo for the come down. But if you took 30 pills, and they didnt have an effect on you, I'd say it's a safe bet that ritalin isn't for you. I would seek out a different stimulant, taking that much can be dangerous, even if youre not feeling it's effects..
- Hopeless..