In this paper on the effect of methylphenidate (MpH) use on cognition (see https://doi.org/10.1016/j.euroneuro.2021.02.002) we show that the effects of 3 months of MpH use on cognition are limited to the moment of treatment in both boys and men with ADHD. So if one stops using MpH after such a time frame, the positive (or negative) effects of MpH on cognitive performance also stops. This is what we expected to see in men, but in boys we thought that the effect would last. However, this happens not to be the case.
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