A device for administering a bolus, includes an actuating element to actuate a closing mechanism which opens and closes a hose segment. The hose segment can be connected to a fluid source and to a patient. The device also includes a movable element, a blocking element which locks the movable element in an upper position and which can be released by the actuating element, an elastic element which pushes the actuating element and movable element apart, a first actuation blocking element which locks the actuating element in a lower position and can be released by the movable element, and a bolus reservoir for holding a bolus quantity of fluid. The volume of the bolus reservoir can be reduced by displacing the movable element. A second actuation blocking element locks the actuating element in the upper position can be released by the movable element.
