Z-DEVD-FMK, a Caspase-3 Inhibitor, is an irreversible, cell-permeable inhibitor of caspase-3/CPP32 that impedes tumor cell apoptosis. In vivo studies show it offers neuroprotection in rat hippocampi post-seizures and considerably diminishes post-traumatic apoptosis, enhancing neurological recovery in rats before and after traumatic brain injury induction.