comfortis flea pill for dogs
Mia Lopez
Updated on June 07, 2026
See the Comfortis label for complete safety information. For dogs: The most common adverse reaction reported is vomiting. Other adverse reactions reported in decreasing order of frequency are: depression/lethargy, decreased appetite, incoordination, diarrhea, itching, trembling, excessive salivation and seizures.
Is Comfortis good for dogs?
Spinosad is approved for dogs or cats 14 weeks of age and older. The product combined with milbemycin oxime is approved for dogs 8 weeks of age or older as long as they weigh at least 5 lbs. The product is beef-flavored so as to be accepted by the pet as a treat.
How long does it take for Comfortis flea pill to work?
Fortunately for you and your dog or cat, Comfortis® (spinosad) works quickly to protect your pet from fleas. Comfortis starts killing fleas in 30 minutes of the first dose and killed 100% of fleas on dogs and 98% of fleas on cats in just four hours in controlled laboratory studies.
Does Comfortis have side effects?
What is the risk associated with Comfortis? The most common side effect is vomiting, which is mild and transient in most dogs and cats. Other common side effects in cats include diarrhoea and loss of appetite.
Is Capstar the same as Comfortis?
A key difference between Capstar and Comfortis is that Comfortis will keep killing adult fleas that bite your pet for 28days after a single dose. Comfortis also slows the egg production of fleas so helps to prevent your home becoming infested.
How many dogs have died from Comfortis?
Carmichael reports dispensing 10,000 doses of Comfortis over the last two years with no serious side effects. The FDA lists 222 deaths reported and another 118 by euthanasia. The FDA admits the numbers are dated and from an old reporting system. They also constitute no proof, only suspicion.
Is Trifexis and Comfortis the same?
Trifexis is a combination of two medications that handle fleas and parasites. Comfortis deals only with fleas. Trifexis can be given to puppies as early as 8 weeks and 5 pounds, while Comfortis is safe for puppies a minimum of 14 weeks old.
Can Comfortis cause seizures in dogs?
Comfortis side effects
The initial studies and post-approval data for Comfortis list the side effects for a small number of dogs (in decreasing order of frequency) as: vomiting, depression and lethargy, anorexia, ataxia, diarrhea, pruritus (itching), trembling, hypersalivation and seizures.
How long does Comfortis last?
KILL FLEAS ON YOUR DOG OR CAT.
Comfortis® (spinosad) starts killing fleas in 30 minutes, before they can lay eggs. Plus, Comfortis lasts a whole month—it can’t be washed, rubbed or shaken off.
What kills all stages of fleas on dogs?
Vacuum often. All four stages of fleas are killed after vacuuming, with a 96 percent success rate. Homes that are vacuumed often will usually not have a flea problem that persists for long, because the eggs, larvae, pupa and adult fleas will all be killed or removed through the vacuum.
How often can you give a dog Comfortis?
Safe for dogs 14 weeks of age or older and 5.0 pounds of body weight or greater. One chew, every month. Administer one tablet of Comfortis once every month to provide year-round protection.
What is the best flea pill for dogs?
Our pick for best oral flea control product for dogs is Simparica TRIO, a chewable tablet that is fast-acting and kills more parasites than any other oral product. Simparica TRIO starts to work within four hours and kills 100% of adult fleas on dogs within eight hours.
Is Comfortis safer than NexGard?
Winner: NexGard
Though NexGard is a bit more expensive than Comfortis, it works against more parasites than Comfortis. Additionally, it is safe for younger puppies and has fewer side effects.
Can Comfortis be cut in half?
So if you’re using tablets, such as Comfortis, Sentinel, or Program Tablets, to prevent and kill fleas, don’t split them unless your veterinarian specifically instructs you to do so.
Can I crush Comfortis?
Yes the vet has approved Comfortis, as it is prescription-only (hence the price!) It’s in chewable pills, so presumably they’d be OK to crush, but as I said I’d prefer to try any other options first, as I seriously think he’d just refuse to eat any meal with crushed tablet in (even a small amount).
What is the generic name for Comfortis?
Description: Comfortis (spinosad) is available in four sizes of chewable flavored tablets for oral administration to cats and kittens according to their weight.
Can Capstar be given with Comfortis?
It’s not usually recommended to use more than one oral flea medication at the same time. However, Comfortis and Capstar can be combined. Another exception is Sentinel, which doesn’t kill adult fleas, so it can be combined individually with either Comfortis or Capstar.
Do vets use Capstar?
One of the best treatments against adult fleas for cats and dogs is an oral flea medication that contains nitenpyram and goes by the name Capstar. Your vet will probably recommend Capstar to you, but you can get the oral flea medication over the counter, too.