I saw this in an article a couple days ago, made sure it wasn’t a med I was using, and went on with my day. I completely missed how the parent company has chosen to handle this.
Short form: the flea and tick medication named Promeris has been determined to cause severe heath issues in a signifigant percentage of cats and dogs. If you are using this medication you should stop and contact your vet for an alternative. Pfizer however has decided to NOT recall the medication already on the market. Instead they’ve simply halted production. They estimate there is enough already on the market to last through September, or basically the entire flea and tick season.
See here for more information including basic information on the symptoms of the afor mentioned health problems.
Thanks to K9 Solutions blog for the link.