A device (1405;2405;3405;4405;5405) for dispensing a substance, which may be a pharmaceutical substance, having:- a dispensing outlet (1411;2411;416;916;516), which may be in a nozzle sized and shaped for insertion into a nostril of a human or animal body, from which the substance is dispensable, a dispensing member, which may be a dispensing container for containing a supply of the substance (1408;2408;3408;4408;5408), mounted for movement in a dispensing direction from a first position to a second position, said movement, in use, causing the substance to be dispensed from the dispensing outlet, and an actuator mechanism (1415;2415;3415;4415;5415) for moving the dispensing member from the first position to the second position, said actuator mechanism having: a first member (1420;2420;3420;4420;5420), which may be a finger-operable actuator member which may be the sole actuator member, mounted for pivotal movement in a first pivotal sense, and a second member which is a bell-crank (1425;2425;3425;4425;5425) which is pivotally mounted on the first member, wherein the second member has plural pairs of arms (1425a,b;2425a,b;3425a,b;4425a,b) extending therefrom, and wherein each pair of arms has - one arm (1425b;2425b;3425b;4425b) adapted to engage with a pusher surface of the actuator mechanism, and - a carrier arm (1425a;2425a;3425a;4425a); wherein the actuator mechanism is adapted such that movement of the first member in the first pivotal sense results in the second member moving therewith and the one arm of each pair of arms engaging the pusher surface to cause pivoting of the second member, and wherein the second member is pivotally mounted on the first member for pivotal movement in a second pivotal sense which is opposite to the first pivotal sense, and wherein said pivoting of the second member caused by engagement of the one arm of each pair of arms with the pusher surface is in the second pivotal sense and results in the carrier arm of each pair of arms carrying the dispensing member from the first position to the second position. a dispensing outlet (1411;2411;416;916;516), which may be in a nozzle sized and shaped for insertion into a nostril of a human or animal body, from which the substance is dispensable, a dispensing member, which may be a dispensing container for containing a supply of the substance (1408;2408;3408;4408;5408), mounted for movement in a dispensing direction from a first position to a second position, said movement, in use, causing the substance to be dispensed from the dispensing outlet, and an actuator mechanism (1415;2415;3415;4415;5415) for moving the dispensing member from the first position to the second position, said actuator mechanism having: a first member (1420;2420;3420;4420;5420), which may be a finger-operable actuator member which may be the sole actuator member, mounted for pivotal movement in a first pivotal sense, and a second member which is a bell-crank (1425;2425;3425;4425;5425) which is pivotally mounted on the first member, wherein the second member has plural pairs of arms (1425a,b;2425a,b;3425a,b;4425a,b) extending therefrom, and wherein each pair of arms has - one arm (1425b;2425b;3425b;4425b) adapted to engage with a pusher surface of the actuator mechanism, and - a carrier arm (1425a;2425a;3425a;4425a); a first member (1420;2420;3420;4420;5420), which may be a finger-operable actuator member which may be the sole actuator member, mounted for pivotal movement in a first pivotal sense, and a second member which is a bell-crank (1425;2425;3425;4425;5425) which is pivotally mounted on the first member, wherein the second member has plural pairs of arms (1425a,b;2425a,b;3425a,b;4425a,b) extending therefrom, and wherein each pair of arms has - one arm (1425b;2425b;3425b;4425b) adapted to engage with a pusher surface of the actuator mechanism, and - a carrier arm (1425a;2425a;3425a;4425a); - one arm (1425b;2425b;3425b;4425b) adapted to engage with a pusher surface of the actuator mechanism, and - a carrier arm (1425a;2425a;3425a;4425a);