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Review title: defective or knock off?
Product review: Just opened one vial of Frontline Plus for cats we purchased through Amazon. I immediately noticed it smelled wrong. We have used Frontline for our dogs and cats for many years, so I am very familiar with it. Upon further investigation, I noticed one sealed vial in the package was completely empty and all of the rest had uneven amounts of liquid in the vials. Not sure if this is a defective batch or some knockoff product. I called customer service and was able to get a refund even though it is not returnable(hazardous material). VERY disappointed in this product and I hope Amazon immediately checks and verifies the quality of their remaining inventory.
