Liquid dispenser for discharging a pharmaceutical liquid or a liquid containing nicotine and/or cannabis, having the following features: a. the liquid dispenser comprises a liquid reservoir, and b. the liquid dispenser comprises a discharge apparatus, which has a base coupled to the liquid reservoir and an actuator which is movable relative to the base, and c. the discharge apparatus has at least one discharge opening, through which liquid can be released into an ambient atmosphere, and d. the liquid dispenser comprises a pump device which has a volumetrically variable pump chamber, the pump chamber being connected to the liquid reservoir via an inlet channel with an inlet valve and being connected to the discharge opening via an outlet channel with an outlet valve, and e. the actuator of the discharge apparatus is coupled to the pump device, such that moving the actuator relative to the base makes it possible to actuate the pump device, and f. the liquid dispenser is in the form of a modular liquid dispenser having two sub-units (12, 14), and g. a first one of the sub-units comprises the liquid reservoir and the pump device, and h. a second one of the sub-units comprises the discharge apparatus and an inlet for providing a fluid connection with an outlet of the first sub-unit, and i. the two sub-units (12, 14) have interacting coupling sub-devices (16A, 16B) of a coupling device, in order to be able to be coupled to and decoupled from one another without tools, and j. the pump device has an outlet port, through which the outlet channel passes and by means of which the volume of the pump chamber can be varied, characterized by the following further feature: k. a protective covering element is provided on the pump device and prevents direct manual actuation of the pump device without the discharge apparatus. a. the liquid dispenser comprises a liquid reservoir, and b. the liquid dispenser comprises a discharge apparatus, which has a base coupled to the liquid reservoir and an actuator which is movable relative to the base, and c. the discharge apparatus has at least one discharge opening, through which liquid can be released into an ambient atmosphere, and d. the liquid dispenser comprises a pump device which has a volumetrically variable pump chamber, the pump chamber being connected to the liquid reservoir via an inlet channel with an inlet valve and being connected to the discharge opening via an outlet channel with an outlet valve, and e. the actuator of the discharge apparatus is coupled to the pump device, such that moving the actuator relative to the base makes it possible to actuate the pump device, and f. the liquid dispenser is in the form of a modular liquid dispenser having two sub-units (12, 14), and g. a first one of the sub-units comprises the liquid reservoir and the pump device, and h. a second one of the sub-units comprises the discharge apparatus and an inlet for providing a fluid connection with an outlet of the first sub-unit, and i. the two sub-units (12, 14) have interacting coupling sub-devices (16A, 16B) of a coupling device, in order to be able to be coupled to and decoupled from one another without tools, and j. the pump device has an outlet port, through which the outlet channel passes and by means of which the volume of the pump chamber can be varied,