Comfortis Chewable Tablets (Spinosad)


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Comfortis flea pill for dogs

Comfortis (Spinosad)

This particular medicine comes in 6 different sizes and various flavors and is administered orally to cats and dogs. These are chewable tablets which are given to cats and dogs according to their weight, for example, Comfortis for dogs 60 lbs and comfortis for dogs 120 lbs.

Spinosad is from the family of antibacterial medications and contains two important compounds, which are, spinosyn A and spinosyn D respectively. This particular medicine is primarily given to cats and dogs to cure them of fleas and ticks. This medicine also acts as a preventative treatment to the development of fleas in cats and dogs.

However, ensure that you give these chewable tablets to your cat or dog according to how the vet has instructed you to do so as an overdose may be fatal as animals are sensitive.

You can easily buy Comfortis online from


DOG: Weight (lbs) DOG: Weight (kg) Indicated on Pack CAT: Weight (lbs) Spinosad (mg) Sourced from UK
5 – 10lbs 2.3 – 4.5kg 4.1 – 6lbs 140
10.1 – 20lbs 3.9 – 6kg 6.1 – 12lbs 270 YES
20.1 – 40lbs 9.1 – 18kg 12.1 – 24lbs 560
40.1 – 60lbs 18.1 – 27kg 810
60.1 – 120lbs 23.2 – 36kg 1620 YES
Dogs: Recommended U.S. Minimum Dosage is 13.5mg/lb per month
Cats: Recommended U.S. Minimum dosage is 22.5mg/lb per month


Comfortis should be given to your dog and cat according to the dosage prescribed by your doctor. This chewable medicine is given according to the weight of the dog or cat it has to be administered to. You can give Comfortis to your pet with food or without food.

Basically, this medicine has to be given to cats and dogs at monthly intervals. If your pet starts to vomit within 60 minutes of taking comfortis, give them another full dose.

Preferably, Comfortis should be given one month prior to the primary fleas and ticks season.


The active ingredient in this medicine is Spinosad.


  • It is for cats that are older than 14 weeks and weigh 900 grams or more.
  • Refrain from giving to breeding, breastfeeding and pregnant cats.
  • Other than an approved label, Comfortis should not be given with any other medication.
  • Avoid if your dog has a history of epilepsy or seizures.

Side Effects

As this particular medicine is administered to both cats and dogs, the following are the adverse effects that they can experience. Some of the side effects may overlap.


  • Vomiting
  • Lethargy
  • Diarrhea
  • Weight loss
  • Anorexia


  • Lethargy
  • Vomiting
  • Depression
  • Anorexia
  • Diarrhea
  • Trembling
  • Hypersalivation
  • Seizures

Apart from vomiting, other side effects are considered rare in dogs.


IMPORTANT NOTE: The above information is intended to increase awareness of health information and does not suggest treatment or diagnosis. This information is not a substitute for individual medical attention and should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. See your health care professional for medical advice and treatment.

Product Code : 10283