Why is my cat so tired and sleeping a lot after flea medicine?

I would start by treating the fleas. Fleas can be extremely aggravating and cause some pets to have weird changes in behavior. With large infestations of fleas, they can also cause anemia, which can cause profound lethargy. Other causes of lethargy can range from internal medical illness (diabetes, kidney disease, liver disease), infection, pain from arthritis, etc. I would recommend that you have Blu rechecked by her vet to look into these possible causes. The vet may recommend bloodwork to see how things are going inside of her body.

Hello, thank you for using Petco Pet Education Center, formerly Petcoach. Great question! I would consider the lethargy you are describing as a common reaction but I would not say it is "normal". I think you should switch to a different product as the active ingredient in whatever you are using doesn't seem to agree with Shadow. It is better to switch because sometimes the lethargy can progress to a worse type of reaction with each application. Hope this helps. Best wishes.

It's not likely to be a symptom of the fleas but it could be a symptom of the flea treatment you use, some of them can cause a side effect of lethargy and lack of appetite which usually does not last more than 24 hours. if by tomorrow Jax is not better, i would recommend taking him to your vet to get checked and treated.

Those black spots could be flea dirt or areas of yeast as well. The bald spots could be from skin irritation, self trauma from itching or even another infection called ringworm. The lethargy is concerning as usually Advantage does not cause that change. However fleas can cause anemia even in adult cats as well as transmit bacterial infections that can make a cat very sick. If Mama remains lethargic she needs to get checked out by a veterinarian, sooner if her gums are pale or discolored.

He could be having an adverse reaction to the flea/tick medication. Give him a bath immediately! Then contact your local vet to have him examined and treated for an acute allergic reaction. The most important thing though is to wash off the product. Using dawn dish detergent works best to strip the product off. There is a chance that he has absorbed a good bit of the medication already, but this will help prevent further absorption and subsequent illness. Most adverse reactions to flea/tick products do well with time (minimum 12 hrs to see improvement). I hope your puppy Harley recovers soon!

I think it's kind of unlikely that his signs are related to the flea collar. If he had fleas - which I'm assuming he did, and that's why you got the collar - he could have a serious infection called mycoplasmosis, which produces anemia and weakness. If that's not the problem, he could have any number of problems, as the signs are pretty vague, but clearly not normal. Please get him checked out ASAP, as he sounds quite ill.

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be due to the area feeling different after application of the Bravecto. There are possible reactions associated with any medication or preventative product given to an animal though this would be an unusual reaction to a topical flea preventative like Bravecto. If the skin around at the site it was administered looks normal (not irritated or inflamed) and she is otherwise doing well, I would continue to watch her for now and have her evaluated by your veterinarian tomorrow if no improvement. If she appears to be too different to what she normally is, have her evaluated tonight to ensure she is not having an unusual reaction to the Bravecto. I think she is likely reacting to the application of the product because she can feel something in her skin that she is not used to rather than having a complication. I understand your concern and I hope that she starts acting more like herself quick. Good luck!