The Livestock Repeater Syringe is designed for use by veterinarians and producers to administer animal health medications. Each squeeze of the pistol-grip handle delivers a pre-selected dosage; relaxing of the grip allows the cylinder to reload the precise next injection. Available in two sizes, the 25MR2 syringe adjusts for dosages from .5 to 2.5 ml, while the 50MR2 syringe can be adjust from 1 to 5 ml doses. Other features include a UV-protecting barrel, a locking mechanism to prevent air or contaminants from entering the barrel, and varied-color knobs for differentiating among medications.