An elastase inhibitor that penetrates cells for use in the treatment and / or prevention of cellular necrosis, wherein said elastase inhibitor inhibits the enzymatic activity of intracellular elastase involved in necrotic cell death in cells suffering from necrosis, in which cell necrosis is associated with a disease selected from the group consisting of necrosis associated with the administration and / or self-administration of, and / or exposure to, cocaine, drugs such as paracetamol, chemical toxins, agrochemicals, heavy metals or war organophosphates; vascular dystrophy; iron loading complications; pressure sores; Celiac Disease; anthrax infection; Anderson disease; congenital mitochondrial disease; aseptic necrosis; leukemia; lymphoma; suffocation; jailed hernia; Mellitus diabetes; tuberculosis; endometriosis; cold injuries; complications of steroid treatment; cerebrovascular damage; gangrene; hepatitis; hemoglobinuria; viral septicemia; Burns; hyperthermia; Compartment syndrome; necrotizing procolitis; spinal cord injuries; muscular dystrophy; thyroidmia; hereditary metabolic disease; mycoplasma disease; viral infections; phenylketonuria; placental infarction, syphilis; avascular necrosis; alcoholism.Un inhibidor de elastasa que penetra en las células para usar en el tratamiento y/o prevención de la necrosis celular, en el que dicho inhibidor de elastasa inhibe la actividad enzimática de la elastasa intracelular implicada en la muerte celular necrótica en células que sufren necrosis, en el que la necrosis celular está asociada con una enfermedad seleccionada del grupo que consiste en necrosis asociada con la administración y/o autoadministración de, y/o exposición a, cocaína, fármacos tales como paracetamol, toxinas químicas, productos agroquímicos, metales pesados u organofosfatos de guerra; distrofia vascular; complicaciones por carga de hierro; úlceras de decúbito; enfermedad celíaca; infección por ántrax; enfermedad de Anderson; enfermedad mitocondrial con