Fipronil (Puainta®) for Dogs and Cats

What is Fipronil?

Fipronil is a broad-spectrum insecticide that belongs to the phenylpyrazole chemical family. It is commonly used to control a variety of pests, including insects, ticks, termites, and fleas. Fipronil works by disrupting the central nervous system of insects, leading to paralysis and ultimately causing their death.

Types of Fipronil

Fipronil is available in various formulations, including fipronil spray, dust, fipronil granular, and spot-on treatments for pets. It is widely used in agriculture to protect crops from pests and in veterinary medicine for controlling parasites on animals.

How Does Fipronil Work?

Have you ever wondered how a small tube of flea treatment applied to the back of your dog's or cat's neck protects their entire body from fleas for an entire month? How can something in such a small dose kill so many fleas?

Fipronil is a lipophilic drug, diffused by the oil on the skin surface and stored in the sebaceous glands, and whenever the glands secrete sebum, the amount of fipronil on the skin surface is constantly replenished, which is how it continues to work for a month.

Fipronil works by disrupting the normal functioning of the central nervous system of insects, leading to their paralysis and eventual death.  Fipronil acts as a neurotoxin that specifically targets the receptors for gamma-aminobutyric acid (GABA), which is an inhibitory neurotransmitter in the nervous system of insects. GABA receptors are present in the nerve cells (neurons) of insects, including pests like fleas, ticks, ants, cockroaches, and termites. By blocking the GABA receptors, fipronil disrupts the normal balance of inhibitory signals in the insect's nervous system. This results in an accumulation of excitatory signals, causing hyperexcitation of the nerves. The continuous activation of the nervous system due to the absence of inhibitory signals leads to the repetitive firing of nerve impulses. This results in tremors, convulsions, and eventual paralysis of the insects.

Does Fipronil Kill Ear Mites?

Fipronil can be effective in killing ear mites. Fipronil is an insecticide and acaricide that is commonly used in veterinary medicine to treat various external parasites, including fleas, ticks, and ear mites. It works by affecting the nervous system of these parasites, ultimately leading to their death.

How Long Does Fipronil Take to Kill Fleas?

Fleas will begin to die within 4 to 8 hours of application.  It quickly spreads over the pet's body and begins to kill fleas upon contact. Ticks may take 12 hours or more to die and shed, followed by improvement in clinical signs.

How Much Fipronil is Toxic to Dogs?

According to the National Pesticide Information Center (NPIC), the oral LD50 (lethal dose required to kill 50% of the test subjects) for fipronil in dogs is estimated to be greater than 500 mg/kg. LD50 values are determined through laboratory studies on animals and are used to assess acute toxicity.

However, it's important to note that toxic effects can occur at lower doses, and symptoms of fipronil poisoning may manifest even at levels below the LD50. Common signs of fipronil toxicity in dogs may include vomiting, diarrhea, excessive salivation, lethargy, tremors, seizures, and in severe cases, even death.

So after applying topical fipronil dewormer, remember to wear an Elizabethan collar to prevent your pet from licking it

When Not to Use Fipronil?

The effects of fipronil on pregnancy and breastfeeding are not well-established. As a precautionary measure, it is generally recommended to avoid using fipronil during pregnancy and while breastfeeding unless explicitly directed by a healthcare professional.

Fipronil-based products are not suitable for puppies under eight weeks of age or dogs weighing less than 2 kg. Keep in mind that this may render many toy dogs unusable for life. If your dogs or cats also have a much smaller canine companion living in the home, your veterinarian will help you choose the right method to protect them from ticks and fleas.

Do not use fipronil if you have already used another flea or tick treatment in the last month. Consult your veterinarian if you think the first treatment did not work.

How to Use Fipronil?

It is crucial to follow the recommended dosage and application instructions provided by the product manufacturer or your veterinarian. Wait for the application area to dry before petting your dog. Wash your hands after petting your dog and make sure your children wash their hands.

Do not bathe your lab or let them go swimming for two days after treatment.

Side Effects of Fipronil for pets

Fipronil is a broad-spectrum insecticide that is commonly used in veterinary products to control fleas, ticks, and other parasites in pets. While it is generally considered safe and effective when used as directed, there can be potential side effects and risks associated with its use. 

Some pets may develop an allergic reaction to fipronil. Signs of an allergic reaction can include itching, redness, swelling, hives, difficulty breathing, or collapse.

Fipronil targets the nervous system of insects, and in rare cases, it can cause neurological effects in pets if ingested in large amounts or applied incorrectly. Symptoms may include tremors, incoordination, excessive salivation, seizures, or, in severe cases, coma. 

Side Effects of Fipronil in People

Fipronil is a broad-spectrum insecticide used in various pest control products. While it is primarily used in agricultural settings and for veterinary purposes, accidental or excessive exposure to fipronil in humans can lead to potential side effects. Here are some of the reported side effects:

Skin irritation: Fipronil can cause skin irritation upon direct contact. Symptoms may include redness, itching, and rash at the site of exposure.

Eye irritation: Exposure to fipronil can result in eye irritation, causing redness, tearing, and discomfort. In severe cases, it may lead to conjunctivitis.

Respiratory effects: Inhalation of fipronil dust or vapors may cause respiratory irritation. Symptoms can include coughing, sore throat, and difficulty breathing.

Gastrointestinal symptoms: Accidental ingestion of fipronil can lead to gastrointestinal symptoms such as nausea, vomiting, abdominal pain, and diarrhea.

Headaches and dizziness: Some individuals have reported experiencing headaches and dizziness after exposure to fipronil.

Allergic reactions: In rare cases, people may develop allergic reactions to fipronil, which can manifest as skin rashes, swelling, hives, or difficulty breathing. Anaphylaxis, a severe and potentially life-threatening allergic reaction, is extremely rare but possible.

How Do I Store Fipronil?

Store this drug away from heat or open flames.

FAQs

Is Fipronil Safe for Cats/ Dogs?

 Fipronil is typically safe for cats and dogs when used at the recommended dosage and according to the instructions on the product label. It works by targeting the nervous system of insects and parasites while having a lower toxicity to mammals. 

Can Fipronil Cause Seizures in Dogs?

In rare cases, some dogs may experience adverse reactions to fipronil, including seizures. This is more likely to occur if the product is misused or if the pet is already predisposed to seizures. 

Does Fipronil Kill Ear Mites in Cats?

In addition to its use in controlling fleas, ticks, and chewing lice, fipronil may also be used for the treatment of other ectoparasitic infestations, such as mites responsible for otoacariasis (ear mites). Otoacariasis is a condition where mites infest the ear canal of pets, leading to irritation, itching, and other discomforting symptoms.

However, it is still recommended that ear mite infections in cats are usually treated with specific ear medications prescribed by your veterinarian.

Does Fipronil Kill Flea Eggs?

Yes, but it's worth bearing in mind that fipronil alone won't kill the eggs or larvae in your home. Use fipronil +s-methoprene for better protection. If you have a heavy flea infestation you'll need to spray your house with a home flea spray also.

Puainta® Fipronil Flea & Tick Topical Prevention and Treatment for Dogs/ Cats