Cycloserine/lurasidone, developmental code name NRX-101 and tentative brand name Cyclurad, is a combination formulation of the antibiotic D-cycloserine, an antagonist of the glycine site of the NMDA receptor, and lurasidone, an atypical antipsychotic, which is under development by NeuroRx for the treatment of acute suicidal ideation/behavior. Wikipedia