I bought a 3 months supply of cat flea treatment and put it on two of my cats. One, a male and the other a very pregnant female cat. After a hour both cats starts shaking uncontrollably. I freaked the hell out as I love my animals and am going to school to be a vet. That night one of the cats even started having seizures. I washed both of them off and didn’t know what else to do because it was very late and the vet was not open. I intern at the vet every morning Monday through Thursday. Everyone on there knows me very well, so once I woke up i went straight there with no appointment for an emergency visit. They checked them out and also told me that they see at least one animal A MONTH come in with the same symptoms as mine due to Hartz and they wish they would take it off the market. One of the vets checked out the cats and bathed both of them once again and started them on IV fluids and told me to let them stay so they could keep an eye on them. The doctor said she does not know what will happen to the pregnant cats unborn kittens and that we will have to see when she has them. She said that they could do an emergency C-Section but that was very risky in that she is around 2 weeks until full term. I am extremely infuriated with this product and have contemplated suing if anything is wrong with those precious unborn babies!!!!! I have tried to call Hartz but customer service is closed until tomorrow. They can expect a call from me 9:00 AM SHARP in the morning and I will have a little talk with them with some very colorful language. They WILL be sending me my money back and should really be liable for paying my vet bill. It is all because of those bastards that this even happened.