DVM Express flea killing capsules for dogs and cats 2 - 25 pounds each contain 11.4 mg of nitenpyram, the same active ingredient as the major national brand. Nitenpyram begins to work in as little as 30 minutes and will completely leave your pet's system within 24 hours. Nitenpyram is used to kill adult fleas. Nitenpyram does not kill flea eggs or larvae. To kill eggs and larvae, use the DVM Express Monthly Flea Controlling Capsules. Used in conjunction with each other, they completely destroy the life cycle of the fleas.
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