Hey guys. So recently I've started treatment with methylphenidate, using medicinet. It's similar to concerta. I am taking it nasal way as orally it doesn't work at all. My problem is, that after a few days, my regular dosage stopped working. I took break from taking it but it didn't help at all. I read that DXM could be helpful in reducing tolerance to methylphenidate or cause reverse tolerance. I will grateful for any advise.