Is Trifexis a good flea medicine? Trifexis is approved by the FDA as safe and effective when used according to the label. Spinosad, one of the active ingredients in Trifexis, began to kill fleas on dogs 30 minutes after administration with 100% effectiveness within 4 hours in a well-controlled laboratory study.
Can I buy Trifexis over the counter? Since Trifexis includes a heartworm preventative, it requires a prescription from your veterinarian.
Can my dog still get fleas with Trifexis? Your dog can continue to be exposed to fleas that live in the environment. When fleas jump onto and bite your dog, they will be killed by Trifexis. If, within a month after your dog receives Trifexis, you see fleas on your dog, they are most likely new fleas.
Is Trifexis good for dogs? Fatal adverse reactions were blamed on the flea control medication, but when properly administered, Trifexis is safe for dogs. Trifexis has been approved by the U.S. Food and Drug Administration as a prescription medication for dogs to treat flea infestations.