A medication injection pen, comprising: a housing; a dose set knob comprising an annular shoulder and a plurality of teeth extending axially in the proximal direction from the shoulder ; a setback member comprising an enlarged portion and a plurality of teeth extending axially in distal direction from the enlarged portion ; and a clicker body being ring-shaped and being disposed between said annular shoulder of said dose set knob and said enlarged portion of said setback member , said clicker body comprising a first set of teeth and a second set of teeth , said first set of teeth and said second set of teeth extending axially in opposite directions, the teeth of the first set of teeth having a slope that is opposite to that of the teeth of the second set of teeth, the teeth of said first set of teeth comprise a first sloped surface and a first non-sloped surface, and the teeth of said second set of teeth comprise a second sloped surface and a second non-sloped surface, said clicker body facilitating generating a tactile signal or clicking noise during dose setting and dose correcting; and a dose stop member for last dose management preventing the setting of a dose that is larger than the remaining amount of medication, wherein during dose setting, the dose set knob rotates relative to the setback member and therefore also relative to the dose stop member . a housing; a dose set knob comprising an annular shoulder and a plurality of teeth extending axially in the proximal direction from the shoulder ; a setback member comprising an enlarged portion and a plurality of teeth extending axially in distal direction from the enlarged portion ; and a clicker body being ring-shaped and being disposed between said annular shoulder of said dose set knob and said enlarged portion of said setback member , being ring-shaped and being disposed between said annular shoulder of said dose set knob and said enlarged portion of said setback member , said clicker body comprising a first set of teeth and a second set of teeth , said first set of teeth and said second set of teeth extending axially in opposite directions, the teeth of the first set of teeth having a slope that is opposite to that of the teeth of the second set of teeth, the teeth of said first set of teeth comprise a first sloped surface and a first non-sloped surface, and the teeth of said second set of teeth comprise a second sloped surface and a second non-sloped surface, said clicker body facilitating generating a tactile signal or clicking noise during dose setting and dose correcting; and said first set of teeth and said second set of teeth extending axially in opposite directions, the teeth of the first set of teeth having a slope that is opposite to that of the teeth of the second set of teeth, the teeth of said first set of teeth comprise a first sloped surface and a first non-sloped surface, and the teeth of said second set of teeth comprise a second sloped surface and a second non-sloped surface, said clicker body facilitating generating a tactile signal or clicking noise during dose setting and dose correcting; and a dose stop member for last dose management preventing the setting of a dose that is larger than the remaining amount of medication, wherein during dose setting, the dose set knob rotates relative to the setback member and therefore also relative to the dose stop member . <EOS>