Advantage cat flea control is a very effective and safe product if used properly and after a vet consultation.
Advantage comes in a small tube and is a clear, slightly thick liquid that is applied directly to your cat's skin. The medication is absorbed into the cat's system through the skin and is effective for 30 days.
The problem with fleas is not the adult fleas on your pet but their incredible egg laying power! What Advantage does is enter the flea through the blood they get when they bite your pet. It both kills the adult flea within a few hours but also prevents them from laying eggs in your home before they go. Therefore, if a flea jumps on your pet outside to "hitch a ride" into your house they will not be able to accomplish their goal - infesting your house with eggs.
If you already have fleas in your home, it will help minimize the damage by not allowing the adults to lay more eggs and continue the cycle. As the eggs in your house mature into adults they will bite your pet then die.
Advantage would be a good partner in a flea war in your house along with room sprays to kill the eggs.
It would also be a good choice if your pet is allergic to the flea bites - contact sprays, powders and shampoos can irritate already sore, itchy skin.
To apply Advantage, separate the fur between the shoulder
blades in a line about 1 - 1 1/2 inches (head to tail) long so the skin
is visible. Touch the tip of the Advantage tube to the skin and squeeze
out the medication until the tube is empty. Use one tube per cat. You
may need two people for this process depending on the calmness of your
If you have a kitty who won't stand still on a scale, you can
step on the scale yourself, step off and pick up your cat, then step on
the scale again. The difference between the two weights is the weight
of your cat.
Kitten, 5-9 pounds (small cat), and 9 pounds and over (large cat).
Also, I highly recommend buying Advantage through your vet or another
trusted source that they suggest, like 1-800-PetMeds or PetSmart.
There have been reports of fake counterfeit Advantage being sold on some
online stores and Ebay. Below is the link to PetSmart (image link):