Of course psychotic reaction means the drug can induce what laymen would call insanity.
Mania is another slightly different and potentially very dangerous form of psychosis or insanity.
Periods of mania with delusional thoughts can persist for months and years. Support for the claim that the use of Ritalin can cause psychotic reactions can be found in medical literature and studies. As a child neurologist for 35 years, I have authored original descriptions of real diseases characterized by objective abnormalities. Those who died were disproportionately young. They entered our health care system as troubled children.