Others are vouching for their strength--but the stuff in the blister packs I received must be either a faulty batch, or counterfeit .

I've had prescription methylphenidate (generic, such as Methylin), and 5mg of the US generics seem much more effective than the 10mg Mexican brand-name Ritalin. Sometimes I don't feel anything at all--except perhaps a caffeine-like buzz, which includes none of the "focus" I usually get from Ritalin. Yet the blister packs and tablets APPEAR to be the real deal...

Is it possible I got an old batch? Has anyone else noticed this weakness regarding MexRx's Ritalin?