How often can you repeat Capstar?
A single dose of Capstar 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 per day.
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.
INSTRUCTIONS. A single dose of CAPSTAR® (nitenpyram) should kill the adult fleas on your pet. If your pet gets reinfested with fleas, you can safely give another dose as often as once per day.
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.
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.
Delivered in a small tablet Capstar won't rub or wash off, or leave a messy residue on your pet. Capstar has a rapid onset of action – starts killing fleas within 30 minutes – and continues to rapidly kill fleas for 24 hours.
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.
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® Overdose Information
Overdoses are unlikely to cause significant problems. However, if you observe your pet exhibiting any abnormal signs or behaviors that you suspect may be related to an overdose, immediately contact your veterinarian or an animal poison control center.
It is famously known to start killing adult fleas and their infestations in just 30 minutes is a veterinarian-approved potent dog flea killer medication that protects your dog from the irritating flea infestations. Capstar continues to work for the next 24-48 hours after administering it.
Why is Capstar not working?
After 24 hours, this active ingredient is flushed out of the pet's body through natural processes. Thus, as the main component of Capstar stays inside the system only for 24 hours, you may need to administer another tablet the next day for continuous effectiveness.
After your pet takes the Capstar tablet, the Nitenpyram is immersed into the bloodstream very quickly. The minute a flea takes a blood meal from your pet, they ingest enough of the drug to kill them.

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.
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 want to immediately kill any fleas removed from your pup's fur by dunking them in hot, soapy water. If you try to crush or flush these sneaky insects, they might surprise you with their jumping expertise—they're amazing escape artists. Bathe your pet with warm water and mild soap.
CAPSTAR® (nitenpyram) can be used daily, as needed, to help treat and control an existing flea infestation. A monthly flea preventive is recommended for long-term flea prevention.
EFFECTS OF TOXICITY
Nitenpyram is a neorutoxin which kills fleas by inhibiting central nervous system, resulting in paralysis and death of the insect. Nitenpyram is generally safe for use in pets including pregnant or nursing animals, however, very high doses can cause toxicity.
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.
ORAL FLEA TREATMENT
CAPSTAR® (nitenpyram) oral tablets start killing adult fleas in just 30 minutes. Watch the dead fleas fall off your pet.
What are the dangers of Capstar?
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.
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.
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.
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.