Cathy (Wyckoff, NJ, USA) on 07/15/2008:
My Pug, Peanut, developed grand mal seizures after taking Interceptor heartworm medication. I took her off the medication immediately. She had one small seizure 2 months after coming off Interceptor. She is completely seizure free after being off the medication for the last 3 years. I do not give my dogs any heartworm medication as they are mostly indoor dogs. They have all tested heartworm negative even though I do not use heartworm medications. In addition, after the seizure scare, I do not update my dogs' vaccinations. The dosages are too toxic. However, my dogs are mostly indoor dogs.