Abstract
We present the case of a 55-year-old Caucasian male with a history of schizophrenia presenting with severe hyponatremia attributed to long-acting injectable risperidone treatment. Antipsychotic-induced hyponatremia is an uncommon but serious side effect that should be considered when assessing individuals on chronic psychiatric regimens. In this report, we will discuss our treatment plan for the patient when water deprivation and hypertonic saline failed to correct his serum sodium levels. The goal of this case report is to raise awareness of severe hyponatremia as a side effect of long-acting risperidone, and to encourage further studies to create guidelines for its management when current protocols fail to correct sodium levels.