Multi-Layer Veterinary Pill with Barrier for Drug Stability

The patent divides the pharmaceutical preparation into multiple separate layers, each containing specific active ingredients. The first layer contains Praziquantel, Pyrantel, and Febantel, while the second layer contains Moxidectin. This segmentation prevents harmful interactions between incompatible compounds while maintaining the versatility of treating multiple parasite types, directly resolving the contradiction between treatment effectiveness and compound stability.

The patent introduces a barrier layer as an intermediary between the first and second layers containing different active ingredients. This barrier layer acts as a protective mediator that prevents direct contact and interaction between incompatible compounds (such as avermectins/milbemycins and other anthelmintics), thereby maintaining the stability of sensitive compounds while allowing the preparation to remain multi-functional.

The patent segments the low-dose potent drug (Moxidectin) into a separate second layer, isolating it from other active ingredients and excipients in the first layer. This segmentation allows for precise control of the low-dose component while maintaining uniform distribution within its own layer, solving the contradiction between dosage precision and content uniformity.

The patent applies local quality by creating distinct layers with different compositions and properties. The second layer is specifically designed to contain and protect the low-dose potent drug with appropriate local characteristics (such as controlled particle size and distribution within that layer), ensuring both precision and uniformity for the sensitive compound without being affected by other ingredients.

The patent segments the preparation into a straightforward two-layer structure with a barrier layer in between. This simple segmentation approach achieves the stability benefit by separating incompatible compounds while minimizing structural complexity. The clear division into first layer (Praziquantel, Pyrantel, Febantel), barrier layer, and second layer (Moxidectin) makes the design easy to manufacture and understand.

The barrier layer serves as a simple intermediary element that provides the necessary separation and protection without introducing complex mechanisms. This intermediary layer is designed to be relatively simple in structure, achieving the stability function through its presence rather than through complex active mechanisms, thus balancing protection with manufacturability.