The aim of the present study was to investigate whether the use of lithium followed recommended practice in acutely manic adolescent inpatients. This study was a 12-month retrospective review of patients with manic episode admitted to Bakırköy Mazhar Osman Mental Health and Neurological Diseases Education and Research Hospital. Length of stay, medication data, serum levels and adverse effects were recorded for patients who started lithium treatment within average of 7 days of admission (n = 52). Average length of stay was 23.63 (SD = 17.6). The maximum dose prescribed within 24 h of starting treatment was 721.15 mg (SD = 239.5). The maximum daily dose was reached in an average of 7 days to 1136.5 mg (SD = 336.4). The average time after starting treatment until the first recorded serum level was 5 days. The average serum level reached was 0.5 mEq/L (SD = 0.22), which was raised to 0.6 mEq/L (SD = 0.3) at discharge with an average daily dose of 1038.46 mg (SD = 460). In 8 admissions (15.4%), one adverse effect was recorded that could have been related to lithium treatment but adverse events did not lead to discontinuation of drug. The literature supports that rapidly attained high serum levels are associated with positive outcomes. In this current study, clinicians used a relatively slow dose titration and lower serum levels were obtained suggesting that lithium was not considered as a primary agent for treating mania. Taking advantage of lithium especially for the maintenance treatment of bipolar disorder and tolerability may have driven these findings.