A syringe, comprising: a barrel having an internal surface defining an internal bore therein, a distal end of the barrel defining an outlet port; a plunger having a distal end disposed within the internal bore of the barrel, and a proximal end disposed outside the internal bore of the barrel, the proximal end of the plunger being opposite the distal end of the plunger along a longitudinal direction, the plunger including a vial having an internal volume, the internal volume being configured to contain a fluid, the internal volume being in fluid communication with the outlet port of the barrel; and a dose divider removably coupled to the plunger and configured to bear on the barrel in response to translation of the plunger relative to the barrel along the longitudinal direction, the dose divider including: a flange extending at least partly in a radial direction, the flange having a distal surface that faces the barrel, the distal surface of the flange bearing on the proximal end of the plunger, and a concave shell extending away from the distal surface of the flange along the longitudinal direction, the longitudinal direction being perpendicular to the radial direction, a proximal end of the concave shell being disposed on the flange, and a distal end of the concave shell being opposite the proximal end of the concave shell along the longitudinal direction, the concave shell extending in a circumferential direction about an axis from a first circumferential edge to a second circumferential edge, the axis being aligned with the longitudinal direction, the first circumferential edge being separated from the second circumferential edge by a gap distance, the length of the dose divider in said longitudinal direction being shorter than the length of the plunger, wherein the first circumferential edge and the second circumferential edge extend from the proximal end of the concave shell to the distal end of the concave shell, the concave shell of the dose divider subtends an angle in the circumferential direction about the axis from the first circumferential edge to the second circumferential edge that is greater than 180 degrees, and the concave shell of the dose divider further includes a concavity open to an environment of the dose divider in the radial direction as well as the longitudinal direction. a barrel having an internal surface defining an internal bore therein, a distal end of the barrel defining an outlet port; a plunger having a distal end disposed within the internal bore of the barrel, and a proximal end disposed outside the internal bore of the barrel, the proximal end of the plunger being opposite the distal end of the plunger along a longitudinal direction, the plunger including a vial having an internal volume, the internal volume being configured to contain a fluid, the internal volume being in fluid communication with the outlet port of the barrel; and a dose divider removably coupled to the plunger and configured to bear on the barrel in response to translation of the plunger relative to the barrel along the longitudinal direction, the dose divider including: a flange extending at least partly in a radial direction, the flange having a distal surface that faces the barrel, the distal surface of the flange bearing on the proximal end of the plunger, and a concave shell extending away from the distal surface of the flange along the longitudinal direction, the longitudinal direction being perpendicular to the radial direction, a proximal end of the concave shell being disposed on the flange, and a distal end of the concave shell being opposite the proximal end of the concave shell along the longitudinal direction, the concave shell extending in a circumferential direction about an axis from a first circumferential edge to a second circumferential edge, the axis being aligned with the longitudinal direction, the first circumferential edge being separated from the second circumferential edge by a gap distance, the length of the dose divider in said longitudinal direction being shorter than the length of the plunger, wherein a flange extending at least partly in a radial direction, the flange having a distal surface that faces the barrel, the distal surface of the flange bearing on the proximal end of the plunger, and a concave shell extending away from the distal surface of the flange along the longitudinal direction, the longitudinal direction being perpendicular to the radial direction, a proximal end of the concave shell being disposed on the flange, and a distal end of the concave shell being opposite the proximal end of the concave shell along the longitudinal direction, the concave shell extending in a circumferential direction about an axis from a first circumferential edge to a second circumferential edge, the axis being aligned with the longitudinal direction, the first circumferential edge being separated from the second circumferential edge by a gap distance, the length of the dose divider in said longitudinal direction being shorter than the length of the plunger, wherein the first circumferential edge and the second circumferential edge extend from the proximal end of the concave shell to the distal end of the concave shell, the concave shell of the dose divider subtends an angle in the circumferential direction about the axis from the first circumferential edge to the second circumferential edge that is greater than 180 degrees, and the concave shell of the dose divider further includes a concavity open to an environment of the dose divider in the radial direction as well as the longitudinal direction.