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Advantage II for Cats gets consistently high ratings from both vets and cat owners. Though it doesn't work for every cat, it's more reliably effective than any other product. One monthly dose, applied to the back of the cat's neck, kills adult fleas as well as eggs and larvae. Most owners find this flea control easy to apply, but some say it's a bit messy. Side effects are very rare, but can be serious.ProsKills adult fleas, eggs and larvae, Highly effective, Side effects are rare, No prescription requiredConsLeaves greasy residue
Beats the competition. Advantage II for cats contains two key ingredients: imidacloprid, which kills adult fleas, and pyriproxyfen, which stops the growth of flea eggs and larvae. Vets describe Advantage II for Cats as very effective, and most owners agree. Many reviews on pet-product websites specifically note that this product worked when its leading competitor, Frontline Plus for Cats (Est. $40 for a three month supply), failed. However, some owners complain that Advantage II didn't work for their cats or that its effects wore off before the month was out. A few owners say that for them, the original version of Advantage (without pyriproxyfen) works better.
Few problems, but some can be serious. Vets describe Advantage II for cats as a very safe product. Most reviews from cat owners say that this flea control works without causing any side effects; a few even note that it is the only product their pets can tolerate without an adverse reaction. However, we saw a few reports at Amazon.com from owners whose cats suffered side effects -- some serious -- after use. While these problems appear to be extremely rare, it's probably wise to watch your cat closely after using Advantage II and be ready to call the vet if necessary.
No muss, slight fuss. Advantage II comes in single-dose tubes. To apply it, you part the fur at the back of the cat's neck and squeeze out the entire contents of the tube onto the skin. It needs to be applied in a spot the cat can't lick, as ingesting it can cause excessive drooling and hyperactivity. Most owners find Advantage II very easy to apply, although some cats may put up a struggle. The product may leave a greasy spot on the back of the neck; some owners say this dries quickly, while others say it stays wet for days and rubs off on the owner's hands. Most owners don't find the smell bothersome.
Bayer Advantage II Flea Control Treatment for Cats, Contributors to Amazon.com, As of May 2016
Advantage II for Cats in its various strengths and dosages receives more than 4,840 user reviews here, earning 4.4 stars out of 5, with additional reviews at Amazon.com spread across multiple pages. Most cat owners say they find this product effective, fast-working and easy to apply. However, some say it didn't work, and a few complain of dangerous side effects.
Advantage II, Contributors to 1800PetMeds.com, As of May 2016
There are more than 2,750 user reviews of Advantage II at this online pet pharmacy, covering both the dog and cat versions of the product. Users give it 4.2 stars out of 5 overall, with 4.2 stars for effectiveness. Comments are helpful, though less detailed than what we see at Amazon.com.
Advantage II Once-A-Month Topical Small Cat Flea Treatment, 6 mo., 5 to 9 lbs., Contributors to Petco.com, As of May 2016
We found more than 605 reviews of Advantage II for Cats at Petco.com, with most comments left for the small cat variety (5 to 9 pounds). Its overall rating is 4.7 stars out of 5. Though a small handful describe the product as ineffective, most say that it works well and with fewer adverse reactions than with other treatments.
Flea Eradication, Staff of All Feline Hospital, Not Dated
Vets at the All Feline Hospital in Lincoln, Neb., list Advantage II for Cats among the best flea treatments available without a prescription. They say the product is "very safe and effective."