Abstract Introduction Modafinil and methylphenidate are used off‐prescription for cognitive enhancement in healthy individuals. Such use is often reported in online surveys but it is unclear whether drug use for cognitive enhancement is motivated by perceived poor cognitive performance or a desire to improve good cognitive performance. The current study investigated whether off‐prescription users of modafinil and methylphenidate differed in their self‐perceived cognitive performance from people who do not take these drugs. Method An online survey targeting forum sites assessed self‐perceived cognitive function via the Adult Attention Deficit/Hyperactivity Disorder Self‐Report Scale, the Cognitive Failures Questionnaire, and the General Procrastination Scale. Results There were 249 respondents, of whom 43% reported no use of modafinil and methylphenidate (the control group) and 58% reported use of one or both drugs without a prescription for cognitive enhancement. This created an independent samples design with three groups. On both the Adult Attention Deficit/ Hyperactivity Disorder Self‐Report Scale and General Procrastination Scale, modafinil and methylphenidate users reported higher scores than the control group, indicating higher levels of perceived inattention and procrastination. Scores on the Cognitive Failures Questionnaire indicated that modafinil and methylphenidate users rated themselves as having fewer cognitive failures than controls. Conclusion These findings suggest that at least some reported off‐prescription users of modafinil and methylphenidate may be seeking to reduce the impact of self‐perceived poorer performance, particularly in forms of cognition that are likely to impact on self‐directed or self‐motivated work.
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