A drug delivery device comprising: a single dose setter (202, 402); a primary reservoir configured to contain a first medicament; a secondary reservoir configured to contain a second medicament, wherein the primary reservoir and the secondary reservoir are positioned side-by-side; a first dose dial component (204, 404) configured to select a first dose of the first medicament (208, 408), wherein the first dose dial component (204, 404) is operably connected to the dose setter (202, 402) and comprises a first threaded arrangement (214, 414) configured to rotate the first dose dial component (204, 404), a second dose dial component (206, 406) configured to select a second dose of the second medicament (210, 410), wherein the second dose dial component (206, 406) comprises a second threaded arrangement (216, 416) configured to rotate the second dose dial component (206, 406), a collar (212, 412), wherein the first dose dial component (204, 404) and the second dose dial component (206, 406) are connected to the collar (212, 412) and the collar (212, 412) moves in a proximal direction by actuation of the single dose setter (202, 402); characterised in that when the collar (212, 412) moves in a proximal direction by actuation of the single dose setter (202, 402) the first dose dial component (204, 404) and the second dose dial component (206, 406) move proximally to set a variable dose "A" for the first medicament (208, 408) with the first dose dial component (204, 404) by the first threaded arrangement (214, 414) and to automatically set a non-user settable, predetermined dose "B" for the second medicament (210, 410) with the second dose dial component (206, 406) by the second threaded arrangement (206, 406). a single dose setter (202, 402); a primary reservoir configured to contain a first medicament; a secondary reservoir configured to contain a second medicament, wherein the primary reservoir and the secondary reservoir are positioned side-by-side; a first dose dial component (204, 404) configured to select a first dose of the first medicament (208, 408), wherein the first dose dial component (204, 404) is operably connected to the dose setter (202, 402) and comprises a first threaded arrangement (214, 414) configured to rotate the first dose dial component (204, 404), a second dose dial component (206, 406) configured to select a second dose of the second medicament (210, 410), wherein the second dose dial component (206, 406) comprises a second threaded arrangement (216, 416) configured to rotate the second dose dial component (206, 406), a collar (212, 412), wherein the first dose dial component (204, 404) and the second dose dial component (206, 406) are connected to the collar (212, 412) and the collar (212, 412) moves in a proximal direction by actuation of the single dose setter (202, 402); characterised in that when the collar (212, 412) moves in a proximal direction by actuation of the single dose setter (202, 402) the first dose dial component (204, 404) and the second dose dial component (206, 406) move proximally to set a variable dose "A" for the first medicament (208, 408) with the first dose dial component (204, 404) by the first threaded arrangement (214, 414) and to automatically set a non-user settable, predetermined dose "B" for the second medicament (210, 410) with the second dose dial component (206, 406) by the second threaded arrangement (206, 406).