Program Suspension is a once-a-month oral suspension for the prevention and control of flea populations in cats and kittens four weeks of age and older. Program Suspension do not kill adult fleas, but effectively and safely control flea populations by breaking the flea's life cycle at the egg stage. After biting a Program treated cat, the female flea ingests lufenuron which is deposited in her eggs. Lufenuron prevents these flea eggs from developing into mature adults. To speed control, products that kills adult fleas may be used temporarily with Program Flavor Tabs, depending on the severity of the infestation. Since Program Suspension is a liquid, it mixes easily with wet food. Shipping weight: 1/6 lb.