Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Absolutely ineffective against fleas in my area.

Always check with your vet, even if buying online. They will have a better understanding if the fleas around you have developed an immunity to a particular flea treatment. Had I known that my vet no longer even carries Frontline due to its uselessness here, I would not have wasted time and money on this product. I am glad to know there are alternatives. Hopefully Merial is in the process of reformulation; too bad they do not stand by their product. Nevertheless I have informed them of the lot number and the complete ineffectiveness of this item at my location.