A recent study that has appeared in the journal NeuroImage:Clinical, reports that subjects who had been treated with methylphenidate (Ritalin) before the age of 16, had significantly lower levels of the inhibitory neurotransmitter gamma-Aminobutyric acid (GABA) as adults, compared with subjects who had started methylphenidate therapy after age 23, and subjects who had never taken psychostimulants....
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