Methylphenidate overdose question?

Hello, so I have ADD. I take an odd dosage number of 27 mg methylphenidate. I was curious as to this drug I am taking, if I were to take about 3 of the pills(orally) would this act like the drug "speed". No, I am not a drug user, and do not plan on doing this, or letting anyone I know do this. I am purely just curious. Please answer me, also, is methylphenidate the same thing as ritalin? Thank you.