Flea and tick sprays and products are used all the time by pet owners. There are times when pets have bad reactions to these products. There were some incidents reported  where pets died  as a result of flea and tick product usage. The EPA  advises that you speak with your vet about using flea and tick products effectively and   responsibly.  Make sure that you follow the directions carefully and monitor your pet for any bad reaction, especially if you are using the product for the first time.  Keep the packaging of the products that you are using in case side effects occur. You will need  the contact information of the manufacturer.

If side effects do occur, contact your veterinarian immediately.  You can also contact the National Animal Poison Control Center at 1-888-426-4435.

To report any problems with flea and tick products, contact  the National Pesticide Information Center at 1-800-858-7378.

Personally, I do not use flea and tick products on my cats at this time.  If there is a time when I suspect that they may have fleas or ticks, I will seek the advice of my vet before buying any particular product.