Abstract
A topical spot-on solution was developed for treating pets that contained of active ingredients metaflumizone and amitraz and intended for use as an ectoparasiticide. The formulation vehicle system was designed by balancing the following three attributes of various solvents: evaporation/drying, surface spreading, and percutaneous absorption. The solvents were selected by evaluating the solubilization capacity of individual solvents with respect to the above active ingredients. The evaporation rates of various solvent systems were then determined. The visual observations of the treatment sites was also performed a day after treating the dogs to understand the cosmetic effect of various solvent systems. The lead formulations dried off within a day after application with no noticeable residue at the treatment site, while others produced appreciable powdery residue or a large wet and oily spot. The stability of the lead formulations was also evaluated over 2 years to demonstrate a 2-year shelf life of this product.
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