A combination growth promoting pharmaceutical pellet system which delivers doses of both a growth stimulating pharmaceutical agent and a supplemental agent that enhances the growth produced by the growth stimulating agent as part of a single procedure wherein the doses have a synergistic or augmentative effect on physiological growth and weight gain. The system includes an implanter apparatus for subcutaneously implanting pellets in an animal through the bore of a hypodermic needle which is operably coupled to a pellet magazine, and a plurality of pellets sized to be implanted through the needle and positioned in the magazine for selective alignment of a pellet with the needle. The pellets include at least one growth stimulating pharmaceutical agent dose pellet. The implant also includes a supplemental agent dose selected from the group of parasiticides, antibiotics, estrus suppressing compositions, somatotropins, gonadotropins and mixtures thereof. The various agents preferably include both immediate release and time delayed release components.