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A new study found that the number of adults who used two widely prescribed stimulants nearly doubled over a recent five-year period, raising concerns about a potential wave of abuse since both medicines can be highly addictive.

Specifically, an estimated 4.1 million adults reported using amphetamines and methylphenidate in 2018, an increase of nearly 80% from 2013. Measured by total prescriptions, the use of amphetamines rose 119% during that time, while the use of methylphenidate grew about 39%, according to the study, which was published in BMJ Open.

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