Snapples' vet recently told me that there is a shortage of Interceptor and gave me Trifexis instead. I already bought 3 dosages, went home and look up reviews regarding this product. It seems that there are a lot of negative comments about using Trifexis including hair loss, seizures etc etc. Now I'm totally nervous giving Snapples this heartworm medicine. I'm considering returning the meds to the vet.. Any comments/experience on this medicine would greatly help!