ritalin is basically speed. I have to take ritalin for ADHD even though I'm an old fart I still have to as they help. It is never wise to take old pills - how old are they? It's never wise to OD on anything especally medication. I'd say if you want to end up before Christmas in A&E having your belly pumped take them. Otherwise go out and buy your self a wrap of speed - that will give you a kick. Chuck them in the bin....

http://www.nida.nih.gov/Infofacts/Ritalin.html