Why would ANYONE feed their cat Sentry flea products?

I am posting this as a heads up, i gave my cat the sentry flea drops, and had to rush her to the ER because she ALMOST DIED. And when I got to the ER they said they have seen numerous cats that come in after being given this product, and unfortunately, many have died. I was very lucky and blessed that I made it to the pet ER soon enough so they could save her. They had to bathe her and hook her up to IV's. Anyways, I just am putting this up as a forwarning. This and HARTZ are awful products. May be 10 dollars cheaper than frontline, but after 500 in vet bills, the extra 10 are far worth it. Please p this along to all cat owners you know. thank you