The present invention relates to a novel flowable aqueous phenazaquin composition. Conventional flowable aqueous formulations have been found to provide products that have lost tick eradication activity during storage, and low tick eradication activity has been found to be due to unacceptable levels of particle size growth during storage. It has been found that flowable aqueous penazaquine formulations with satisfactory particle size stability can be prepared when high concentrations of dispersant are used in the formulations over conventional concentrations.
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