Immiticide, the only FDA-approved treatment for canine heartworm disease, has been in short supply since 2009 regulatory changes complicated importation of an arsenic-based ingredient. Production problems at the Ohio plant exacerbated the issue, and now the plant is poised to close. For now, veterinarians can obtain the drug on a case-by-case basis, and FDA Center for Veterinary Medicine officials said this week that limited imports will continue. In the meantime, veterinarian Dave Koncal, president-elect of the Ohio Veterinary Medical Association, said the situation serves as an important reminder that owners should be vigilant about keeping dogs on heartworm prevention medication.

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