VAM-IHCA is an investigator-initiated, multicenter, randomized, placebo-controlled, parallel group, double-blind, superiority trial of vasopressin and methylprednisolone during adult in-hospital cardiac arrest. There will be five enrolling sites in Denmark. 492 adult patients with in-hospital cardiac arrest receiving at least one dose of adrenaline will be enrolled. The primary outcome is return of spontaneous circulation and key secondary outcomes include survival at 30 days and survival at 30 days with a favorable neurological outcome.