Treatment adherence is a factor that is affecting the effectiveness of antiepileptic drugs. Levetiracetam is a drug whose effectiveness and safety is well established and is available in different oral formulations (granulates in sachets, tablets, oral solution), but information on treatment adherence/compliance with these oral formulations is limited. To determine treatment adherence with levetiracetam formulations (granulates in sachets, tablets) in adult and elderly people. Retrospective observational non-interventionist study. During the three months before the study patients should be treated with levetiracetam (granulates in sachets or tablets), either alone or in combination. Compliance tests (Green-Morisky modified test) as well as a satisfaction questionnaire investigator and patient/caregiver is assessed. Data were analyzed using SPSS v. 21.0 program. A total of 466 patients completed the study. The average age was 52.75 ± 19.17 years old and the average over 65 years of 72.79 ± 6.15. 55.4% were men. Compliance is related to the variable 'pharmaceutical formulation' and with age (p = 0.031). The risk of non-compliance was 86.4% higher among those taking tablets versus granulates in sachets of levetiracetam (odds ratio: 1.864). Likewise, the non-compliance was greater among patients over 65 years. The non-compliance was related to attributing of memory failures. Patients older are more difficult to compliance. The granulates levetiracetam in sachets improves compliance
