Food and Drug Administration's Evaluation of Approaches To Demonstrate Effectiveness of Heartworm Preventatives for Dogs; Extension of Comment Period

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The Food and Drug Administration (FDA or the Agency) is extending the comment period for the request for comments that appeared in the Federal Register of May 24, 2018. In the request for comments, FDA requested comments on the design of studies intended to generate data to support substantial evidence of effectiveness for investigational new animal drugs intended for the prevention of heartworm disease in dogs. The Agency is taking this action in response to requests for an extension to allow interested persons additional time to submit comments.