Ivermectin for Cats Dosage Chart and Dog Treatment Guide

Overview of Ivermectin (Ivomec®, Heartgard®) for Dogs and Cats

Ivermectin is a broad-spectrum antiparasitic medication commonly prescribed for both dogs and cats. Available under brand names like Ivomec®, Heartgard®, Iverhart®, and others, it is widely used to treat and prevent a variety of internal and external parasite infestations. These parasites include heartworms, intestinal worms, ear mites, mange mites, and more.

This medication works by interfering with the parasite’s nervous system. Specifically, ivermectin enhances the release of neurotransmitters that paralyze and eventually kill the parasites. This makes it highly effective in the management of parasitic infections, but it also means dosage must be carefully controlled.

Because of its potency, ivermectin is available only by prescription and should be administered under a veterinarian’s guidance.

What Does Ivermectin Treat in Dogs and Cats?

Ivermectin is most commonly used for:

• Heartworm prevention in both cats and dogs
• Mange (including demodectic and sarcoptic mange) in dogs
• Ear mites in cats
• Hookworms and roundworms in some treatment protocols

Note: Ivermectin does not kill tapeworms or liver flukes, so other medications may be required for complete deworming.

Ivermectin for Cats Dosage Chart

Proper dosage is critical to avoid toxicity, especially in cats, which are more sensitive to medications than dogs. Below is a general guideline, but always follow your veterinarian’s instructions:

Note: Dosage can vary depending on the form (oral, injectable, topical) and the specific brand used.

Ivermectin Dosage Guidelines for Dogs

Here are standard dosage ranges for dogs based on the condition being treated:

Again, speak with your vet before administering ivermectin. Over-the-counter use without guidance can be dangerous.

Safety, Side Effects, and Breed Warnings

Ivermectin is generally safe when dosed properly, but there are important precautions:

• Collie breeds (Collies, Shelties, Australian Shepherds, etc.) are more likely to experience ivermectin toxicity due to a genetic mutation (MDR1 gene).
• Overdose symptoms can include:
  • Staggering or stumbling
  • Tremors or seizures
  • Disorientation or blindness
  • Weakness or collapse

Signs usually appear within 12 hours of an overdose and require immediate veterinary attention.

Drug Interactions

Use caution when ivermectin is given alongside drugs like Comfortis™ (a flea prevention medication), as adverse reactions can occur at higher doses.

Ivermectin Product Forms

Ivermectin is available in several forms, depending on the intended use and species:

• Injectable solutions (10 mg/ml, 2.7 mg/ml)
• Oral liquids (10 mg/ml)
• Paste (1.87%, 0.153%) – commonly used in horses but sometimes prescribed off-label
• Tablets – 68 mcg, 136 mcg, 272 mcg
• Chewables – found in Heartgard Plus® and Iverhart®, often combined with pyrantel pamoate for deworming

Tips for Pet Owners

• Never administer ivermectin (or any medication) without veterinary direction.
• Cats are especially sensitive to improper dosing. Follow the ivermectin for cats dosage chart exactly.
• For dogs, annual heartworm testing is recommended before starting or continuing ivermectin-based preventatives.
• Store all ivermectin products safely, out of reach of pets and children.

Use Ivermectin Responsibly

Whether you’re treating mange in dogs or preventing heartworms in cats, ivermectin can be a powerful tool when used properly. The ivermectin for cats dosage chart should only be used as a reference. Always work with your vet to determine the correct dosing schedule based on your pet’s weight, health status, and specific needs.

Remember: medication should never be administered without first consulting your veterinarian. If you’re concerned about costs related to medication, pet insurance may be able to help. Click here to learn more.