My cat died after Revolution. Could the medication be the cause?

Do not think the revolution is involved. It is more likely to be related to an hyperacute accident, possibly an underlying cardiovascular disease (thromboembolism for example) possibly related to the kidney failure.

I'm very sorry to hear about the loss of your kitten! How awful. To answer your question, the odds that his death was related to the dewormer he received at the vet are essentially zero. All of the commonly-used dewormers in the US are extremely safe, and I have never seen a single serious problem related to a dose of dewormer in my entire career. It's much more likely that your kitten had some type of unrelated illness that caused his death. If you want to try and find out what happened, the only way to know would be to have an autopsy done, called a necropsy in animals. Your veterinarian should be able to advise you on where you can have this done, if it's something you want to pursue. Again, I'm very sorry for loss.

A heavy parasite load can cause some GI upset such as diarrhea as the worms die off and are expelled from the body. In some cases, multiple dewormings are needed to clear them all. However, if you suspect there is something else going on, such as an allergic reaction to the medication, the worms, or another underlying illness, it would be best to seek veterinary care ASAP for further examination and workup.

I would not worry about severe reactions as selamectin (Revolution) is an avermectin and can be used after Sentry and Advantage multi without a problem. Avermectins are a different class of acaricide and therefore there will be no overdose when used with the others. Both your kitties should be ok and there should be no adverse reaction re the kittens either.

Hello. I am very sorry for your loss. I do not think any of the medications by themselves, or in combination contributed to Kassie's death. None of the medications were given long enough to cause any kind of toxicity level, & all were appropriate for trying to help her. Please accept my condolences for your loss.

It is never recommended to use expired medications. It may not work or can make your pet ill. Purchase new medication from your veterinarian. Apply it a few days before or after bathing. Vacuum everywhere the cat has been and wash all bedding in hot water. Use a feline safe area treatment to prevent reinfestation and treat your cat for a minimum of 3 months, preferably year round.

You received a highly effective preventive medication which also covers mites besides the ones you mentioned. Realize that your kitties probably are stressed out with the two moves, one away from the person they loved (yes hoarder kitties are loved too, and love their owner) to the shelter and then from the shelter to you. Give them lots of TLC and they will get used to their new home soon.