How long does Capstar for dogs last?
Once you administer Capstar Flea Killer, the nitenpyram present in it starts working within the first 30 minutes and continues to work for the next 24 to 48 hours. It's extremely effective for treating persistent flea infestations in adult dogs and cats.
How often can I administer CAPSTAR® (nitenpyram) to my pet? A single dose of CAPSTAR® (nitenpyram) should kill the adult fleas on your pet. If your pet gets re-infested with fleas, you can safely give another dose as often as once a day.
Because Capstar ONLY KILLS ADULT FLEAS on your pet and only works for 24-48 hours (a day or two) The young fleas, Flea egg and Larvae remain.
Capstar flea tablets for dogs and cats are safe. Since nitenpyram doesn't stay in your pet's body for long, it's safe enough to use every day until you get rid of all the fleas.
ORAL FLEA TREATMENT
CAPSTAR® (nitenpyram) oral tablets start killing adult fleas in just 30 minutes. Watch the dead fleas fall off your pet.
Give the proper dosage to your cat/dog and within half an hour you will see any and all fleas falling off and dying off of them. It does NOT repel fleas as a monthly treatment like Frontline or Advantage will do, it only kills all of the fleas that are on your animal currently or who jump on them in 24 hours.
So, the fleas that you see after the administration of Capstar are the newly hatched ones, and not those that were already there. To avoid the re-infestation, you may either need to administer Capstar every day, or follow its administration by a long-term parasite control which targets the early life-stages of fleas.
Your dog or cat may start scratching itself after receiving Capstar®. This is typically because of the pet's reaction to the fleas, not the medication itself. Scratching is usually temporary.
At least six hours after giving the Capstar, bathe the pets. For best results use a mild shampoo, NOT a flea shampoo as it will strip the oils in the skin and prevents the topical products from being as effective.
Step 2: Kill Adult Fleas
Administer Capstar Tablets once per week until adult fleas are no longer observed.
Is Capstar better than Frontline?
They are both safe for use in puppies, with Capstar being recommended for puppies over the age of 4 weeks weighing at least 2 pounds and Frontline for puppies over the age of 8 weeks. Neither product requires a prescription, and they are both effective in killing fleas.
If you are not sure that your pet swallowed the pill, it is safe to administer a second pill. We recommend you follow up Capstar treatment with a monthly flea control product such as Frontline Plus and keep Capstar on hand for the times when there is a visible flea re-infestation.

A single dose of Capstar will kill the adult fleas on your pet. If your pet is re-infested with fleas, you can safely give another dose as often as once per day. It is ...more. A monthly flea preventive is recommended for long-term treatment and prevention of flea infestations.
The following adverse reactions have been reported in dogs after giving CAPSTAR: lethargy/depression, vomiting, itching, decreased appetite, diarrhea, hyperactivity, incoordination, trembling, seizures, panting, allergic reactions including hives, vocalization, salivation, fever, and nervousness.
The most common product used to kill fleas on dogs instantly is Nitenpyram, more commonly known as Capstar. This single-use tablet is administered orally and kills fleas within 30 minutes. It is recommended that you contain your pet in a small area when using Capstar.
During the day, fleas avoid the sun so they are most active at sunset and least active at sunrise. At dusk, the pests would lay more eggs, respire more, and move around in the yard more. Although the fleas are not completely inactive at any time of the day, they have increased activity at dusk and night.
Either Capstar or Comfortis can be combined individually with a variety of other flea and tick medications including one of the following: K9 Advantix II, Frontline Plus for Dogs, Advantage II for Dogs, Revolution for dogs, Pet Armor for Dogs, Advantage Multi, Frontline Top Spot for Dogs, Sentinel, or Farnam Bio Spot ...
You can also give Capstar for several days in a row with no adverse effects. That means that as you are fighting fleas and the flea cycle, Capstar is ensuring that the adult fleas do not live long enough to lay eggs and set the environment up for a new generation of fleas.
At least six hours after giving the Capstar, bathe the pets. For best results use a mild shampoo, NOT a flea shampoo as it will strip the oils in the skin and prevents the topical products from being as effective.
Capstar Side Effects for Dogs
The most common side effects that affect dogs include lethargy or hyperactivity, incoordination and trembling or seizures, and nervousness. Dogs may also experience excessive panting, vomiting, itching, inappetence, and diarrhea.
How do I get rid of my dogs fleas forever?
- Kill fleas with a topical prescription. ...
- Kill fleas with an oral prescription. ...
- Kill fleas with a pet-safe spray. ...
- Wash your pet's bedding in hot water every couple of days. ...
- Wash your pet using flea shampoo. ...
- Use a flea comb. ...
- Regular vet checkups. ...
- Let your pet groom itself.