RESUMEN
Problem drinking, which may be more prominent among young adults, is associated with mental and physical complications. The onset, use, and abuse of alcohol may be related to personality traits such as agreeableness, neuroticism and extraversion. This study aimed to examine the relationship between personality traits and alcohol use among undergraduates in southwest Nigeria. This was a cross-sectional study carried out among undergraduates in southwestern Nigeria. Four hundred and twelve (412) students were recruited using multi-stage random sampling from the total full-time student population. Each participant completed Alcohol Use Disorder Identification Test (AUDIT) and Big Five Inventory-10 (BFI-10). The result showed that the lifetime prevalence of alcohol use was 31.8% while 10.8% were involved in problem drinking. Also, there was an association between alcohol use, male gender and parental history of psychoactive substance use. Out of the 5 personality traits, the extraversion trait was higher among drinkers (P = 0.001) while agreeableness was significantly lower among drinkers (P = 0.033). Extraversion trait was significantly higher in respondents involved in problem drinking (P < 0.001). The predictors of problem drinking in this study were extraversion trait and male gender. The study suggests there are intervening factors mediating personality traits and problem drinking among undergraduates.