IntroductionThe Morisky Medication Adherence Scale (MMAS-8) is widely used to assess medication adherence, yet its psychometric properties have not been evaluated in Ecuador.ObjectiveThis study examined the reliability, factorial structure, and convergent validity of the MMAS-8 in Ecuadorian patients diagnosed with neuropsychiatric disorders.ResultsA total of 440 patients with neuropsychiatric disorders completed the MMAS-8. Internal consistency was evaluated with Cronbach’s alpha and McDonald’s