Why does my prescribed Ritalin not work as okay as it used to?

im taking concerta(same thing as ritalin) and when i took it at first it worked very well, i be able to concentrate and i wasnt falling asleep in class. Now when i take it nil happens, even when i take 2 pills.
Answers:
It sounds like you enjoy built up a tolerance to this particular medication. Ask you doctor to switch you to something else that works in the same behaviour and see how that works out for you.

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