ABSTRACTAdherence is vital for an effective antiretroviral treatment. This cross-sectional study explored social and psychosocial factors associated with adherence among adolescents with perinatal human immunodeficiency virus type 1 infection in Panama from a gender perspective. A questionnaire developed for the study was applied to 38 adolescent patients (20 female, 18 male; median age, 14 years). Thirty-two patients (86%; one missing response) still depended on an adult to remember taking their medication, among whom 28 relied on a female relative. Although 18 (47%) patients reported to become ill no more than once a year, only 10 (26%) patients showed an undetectable viral load, and 4 (11%) patients showed no CD4 suppression. Seventeen (45%) patients recalled correctly their medication. During the week prior to the interview, 26 patients (68%) reported that they had missed at least one dose. When asked the reason for missing a dose, 23 out of 34 (68%; 4 missing responses) patients responded, “I forgot”. Female patients gave more excuses for missing doses (mean ± SD number of excuses per female, 2.4 ± 2; per male, 1.2 ± 1; p = .02), while more male than female patients described an action plan if they ran out of medication (13 vs. 8; p = .05). Educational programs involving patients and also family members are warranted to improve adherence.