Dispenser for discharging pharmaceutical liquids, having the following features: a. the dispenser comprises an elongate housing which is oriented along a centre axis, and b. a discharge opening which is oriented axially in the direction of the centre axis is provided at the distal end of the housing, and c. the dispenser comprises a liquid reservoir, and d. the dispenser comprises a control device which has a pump or a switching valve, which control device is connected by way of a first line to the liquid reservoir and by way of a second line to the discharge opening, and by means of which control device liquid can be conducted from the liquid reservoir to the discharge opening, and e. the dispenser comprises an actuating pushbutton which is provided on the side in a cutout in a lateral surface of the housing and which is connected to the control device in such a way that radial pressing in of the actuating pushbutton in the direction of the centre axis actuates the control device, with the result that liquid is conducted to the discharge opening, characterized by the following additional features: f. the dispenser comprises a rotary sleeve which is open on both sides and is attached on the outer side of the housing such that it can be rotated about the centre axis, or a sliding sleeve which is open on both sides and is attached on the outer side of the housing such that it can be displaced in the direction of the centre axis, and, g. in a locking rotational position or a locking sliding position, the rotary sleeve or the sliding sleeve prevents the actuation of the actuating pushbutton, and, h. in a release rotational position or a release sliding position, the rotary sleeve or the sliding sleeve allows the actuating pushbutton to be pressed in radially. a. the dispenser comprises an elongate housing which is oriented along a centre axis, and b. a discharge opening which is oriented axially in the direction of the centre axis is provided at the distal end of the housing, and c. the dispenser comprises a liquid reservoir, and d. the dispenser comprises a control device which has a pump or a switching valve, which control device is connected by way of a first line to the liquid reservoir and by way of a second line to the discharge opening, and by means of which control device liquid can be conducted from the liquid reservoir to the discharge opening, and e. the dispenser comprises an actuating pushbutton which is provided on the side in a cutout in a lateral surface of the housing and which is connected to the control device in such a way that radial pressing in of the actuating pushbutton in the direction of the centre axis actuates the control device, with the result that liquid is conducted to the discharge opening, f. the dispenser comprises a rotary sleeve which is open on both sides and is attached on the outer side of the housing such that it can be rotated about the centre axis, or a sliding sleeve which is open on both sides and is attached on the outer side of the housing such that it can be displaced in the direction of the centre axis, and, g. in a locking rotational position or a locking sliding position, the rotary sleeve or the sliding sleeve prevents the actuation of the actuating pushbutton, and, h. in a release rotational position or a release sliding position, the rotary sleeve or the sliding sleeve allows the actuating pushbutton to be pressed in radially.