ADVANTAGE (IMIDACLOPRID) from Bayer

This is marketed as a drip-on for both dogs and cats. Advantage seems to be very well tolerated by sensitive cats. It provides flea knockdown in 24 hours. For cat, 100% killing can be maintained for 21 days; for dogs 90% for 28 days. It can be susceptible to wash off, therefore outdoor active dogs and dogs that swim or must be bathed because of dermatitis must be retreated frequently. Imidacloprid has no efficacy against ticks.