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All the latest deals, news and more > Pet Pharmacy > Flea & Tick > Item # 496941


Prescription Required
From $94.49

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All medications are filled by VetSource Pharmacy. More information. Can only be shipped to the 50 US states.
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Product Summary:

Comfortis is the first FDA-approved, chewable, beef-flavored tablet that kills fleas and prevents flea infestations on dogs for a full month.
Comfortis is used to treat and prevent flea infestations.
For use:
Dogs at least 14 weeks old
XXSmall (Yellow) - Dogs 3.3-4.9 lbs/Cats 2-4 lbs
XSmall (Pink) - Dogs 5-10 lbs/Cats 4.1-6 lbs
Small (Orange) - Dogs 10.1-20 lbs/Cats 6.1-12 lbs
Medium (Green) - Dogs 20.1-40 lbs/Cats 12.1-24 lbs
Large (Blue) - Dogs 40.1-60 lbs
XLarge (Brown) - Dogs 60.1-120 lbs
6 tablets
Active ingredient(s):
The safety of Comfortis has not been established in breeding, pregnant, or lactating animals. Make sure to tell your veterinarian what other medication you are giving to your pet. Quite often your veterinarian may prescribe two different medications, even if a drug interaction may occur. In this case, your veterinarian may vary the dose and/or monitor your pet more closely. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.
 Allergic reactions to medications may occur. Be sure to inform VetSource and your veterinarian if your pet has any known drug sensitivities or allergies. If your pet displays symptoms of an allergic reaction, call your veterinarian immediately or go to a veterinary emergency clinic. Symptoms may include but are not limited to: swollen lips, tongue, face, airways; difficulty breathing; agitation; profuse salivation; vomiting; widespread hives and itching.
Side effects:
Side effects may include nausea, vomiting, diarrhea, loss of appetite, and decreased activity. If you notice anything unusual, contact your veterinarian.
Comfortis should be given orally as directed by your veterinarian. If vomiting occurs within an hour of administration, redose with another full dose.
Please note:

We are not a licensed pharmacy.


This prescription product or therapeutic food is fulfilled by VetSource, a licensed pharmacy in all 50 US states.  VetSource only ships to the 50 US states. 


To order prescription products or therapeutic foods  from VetSource you must have an existing, valid veterinarian-client-patient relationship.  Prescription requests are subject to a Drug Utilization Review by a licensed pharmacist at VetSource for patient safety.


All prescription products (excluding therapeutic food) are FDA approved, or EPA licensed, to be sold in the US.


Prescription products cannot be returned. 

Downloadable Resources
Patient Information SheetPatient Information Sheet

Product Reviews by Customers

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Vet Recommended
Ann B on Feb 15, 2015