A nebulizer (1), in particular inhaler, having a pre-installed container (3) is proposed. The container (3) has a fluid outlet (24) with two associated closures (25, 26). A second closure (26) is already pierced in a delivery state where the container (3) is pre-installed in the partly closed nebulizer (1). The first closure (25) is opened just before or when completely closing the nebulizer (1) and using the nebulizer (1).