Nonmedical use of prescription stimulants during college: four-year trends in exposure opportunity, use, motives, and sources.

Objective: Examine trends in nonmedical use of prescription stimulants (NPS), including motives, routes of administration, sources, cost, and risk factors.

Participants: 1,253 college students.

Methods: Data were collected annually during academic years 2004-2005 through 2008-2009. Generalized estimating equations analyses evaluated longitudinal trends. Logistic regression models evaluated stability of associations between risk factors and NPS over time.

Results: Almost two-thirds (61.8%(wt)) were offered prescription stimulants for nonmedical use by Year 4, and 31.0%(wt) used. Studying was the predominant motive (73.8% to 91.5% annually), intranasal administration was modest (< 17% annually), and the most common source was a friend with a prescription (≥ 73.9% annually). Significant changes over time included decreasing curiosity motives, increasing overuse of one's own prescription, and increasing proportion paying $5+ per pill. Lower grade point average and alcohol/cannabis use disorders were consistently associated with NPS, holding constant other factors.

Conclusions: Prevention opportunities exist for parents, physicians, and college administrators to reduce NPS.