The invention includes an implantable composition for management of pain in animals. The composition includes one or more active ingredients, a biocompatible polymer based drug delivery matrix, and other compounds to facilitate composition manufacture and durability. The composition disclosed herein is administered as a veterinary implant device. The implant is inserted subcutaneously into a patient and is designed to function in vivo for prolonged periods of time ranging from multiple weeks to months or even years. Accordingly, the composition must provide a constant release of one or more active ingredients over an extended period of time. To enable combination therapy for pain management, the composition may also include one or more layers of active ingredients seeded into one or more drug delivery systems. Multiple compositions having one or more layers loaded with different active ingredients may also be used in combination therapies.
