My healthy 8 year old cat had a severe reaction to this drug which caused massive vomiting and paralysis for 3 days. We had to seek emergency veterinary attention as we thought our beloved pet was going to die. I am going to take this further and after liasing with other work colleagues who are in the medical profession they had similar stories after administration of this medication to their cats and dogs. A terrible ordeal for myself and other family members to encounter.

Gave the Comfortis Plus to my Staffy and Alaskan Malamute with full meal as advised.
No problems whatsoever.
Had been using just the Comfortis without the worm treatment in it for a few months but then saw them dragging their bums on the ground so switched to the Plus.
The fleas were already under control from using the Comfortis and now no dragging their butts either. Fantastic!

I have been using Comfortis for over 7 years on my 11 year old schnoodle after my trusted vet recommended them. He has never had any problems or side effects. We had a major flea problem that would not go away. It was so bad at one stage that his stomach was covered with fleas and we were getting bitten as well. I tried other flea treatments that just didn't work. I have never seen a flea on him in 7 years.

After I gave my cat comfortis, she starts having breathing problem, then she top eat and drink and week later she died. Please do not give your animals this poison.
Hope my review will save lives.

Terrible!!!! Do not use for cats!! Our once perfectly happy healthy cat is now very skinny! She wont eat, shes vomiting and very lethargic and weak!! I cry just looking at her absolutely heartbreaking!!!! I thought she was dying! Never seen her so sick before! Do not use!!!! I've given her milk mixed with water and she is so keen to drink it but she is that weak she struggling to drink!

I use it on my older cavaliers that I don't use for breeding, found it to be good but don't like products they have to digest but with nothing else working i have had to use it, would never use on my cat.

My ten pound Pomeranian scratches so badly if he gets one flea, I feel sorry for him. I have used Comfortis for years and it lasts more than 30 days. I give him another dose when he starts to scratch or if I see a flea. I make sure he has eaten a full meal before I give him the dose. He won't eat the pill so I cover it in cheese or canned food and down it goes.

I've used all different sorts of flea medication on my boxer and have had poor results. When comfort is first came out I got it & my dog has no fleas or side effects. I also found I only have to give it to him every 2 months. But I'm worried about giving it to my 3 mth old kitten

I bought Elanco Comfortis for both my small dogs, A poodle 12 years old and a Spoodle 6 years old. Within 30 minutes both dogs were vomiting.
I emailed the company and they said that unfortunately these things happen and they could not give me a refund.
Not very happy with the customer service, well there wasn't any!

On Friday night I gave my 4.3kg two year old domestic cat Comfortis. He became very distressed and started panting with his tongue out. He made a strange choking sound as he breathed. I immediately took him to a vet hospital and the vet gave him an antihistamine injection and recommended I take him to vet hospital if his health degenerated overnight. He was floppy and panting most of the night but eventually managed to sleep. He slept most of the weekend and didn't eat very much. He is slowly recovering but I won't be repeating that scary experience.

I gave this product to my cat last night for the first time after our local vet recommended it yesterday. The vet did not advise me of any possible side effects. Today the cat is very sleepy, floppy, lethargic.
I AM SCARED>>>>> I wish I was advised of these side effects prior or read site. I'm terrified.

My 4 year old Russian Blue cat received a dose of COMFORTIS on 12/6/16 in the am. I have just came back from the Vet's office 12/7/16 after having him euthanized because he was going into organ failure. This animal was healthy and vibrant and now I have lost him. It kills fleas and animals and should be BANNED.

I like it for my dogs it works well

I have two 12 year old dogs Iv been using comfort

My healthy 18 month cat had fleas. Took this pill and died 36 hours later. We found him dead in the basement. DO not use!!!!!