PROGRAM Flavor Tabs prevent flea eggs and larvae from developing. This breaks the flea life cycle at its base and effectively wipes out the flea population. PROGRAM Flavor Tabs contain lufenuron, an insect growth regulator. Effective in preventing flea populations. 6, 12 monthly oral doses. See Allivet's Flea and Tick chart to find which flea and tick product is best for your pet.