The invention relates to a nozzle for a device for dispensing product in powder form, having a dispensing duct, with a dispensing opening configured to open freely into an airway of a user, a grid arranged transversally across the dispensing duct, a solid wall arranged in the dispensing duct around the grid forming a dispensing restriction, the dispensing restriction having a flow section smaller than a minimum flow section of the dispensing duct. The invention also relates to a device for dispensing product in powder form by inhalation comprising such nozzle.