Notice: Images are for illustration only and may not reflect the exact product you receive. Brand-name medications may look different depending on their country of origin—Canadian versions, for example, often include a "PR" symbol on the packaging. Rest assured, the medication, dosage, and active ingredients will be exactly as prescribed. Canada Pharmacy Store is committed to your health and safety, and we work only with licensed pharmacies to ensure you receive trusted, high-quality medication every time.
General Medication Fact Sheet for Heartgard
| Field | Information |
|---|---|
| Medication Name | Heartgard |
| Generic Name | Ivermectin |
| Purpose | Prevention of heartworm disease in dogs |
| Mechanism of Action | Interferes with nerve and muscle function of heartworms, preventing their development in the dog |
| Dosage Forms | Chewable tablets |
| Available Strengths | 68 mcg, 136 mcg, 272 mcg (doses are weight-dependent) |
| Dosage Frequency | Once a month |
| Common Side Effects | Vomiting, diarrhea, lethargy/depression, itching |
| Serious Side Effects | Seizures, ataxia (loss of coordination), hypersalivation, blindness (rare) |
| Drug Interactions | Caution with other drugs that affect the nervous system; consult a veterinarian |
| Important Notes | Administer once monthly, year-round, for effective heartworm prevention. Consult a veterinarian for proper dosage based on the dog’s weight. |
| Storage | Store at room temperature in a dry place. |
| Missed Dose | Give the missed dose immediately and resume the monthly dosing schedule. |
| Alternatives | Interceptor (milbemycin oxime), Revolution (selamectin), Trifexis (milbemycin oxime + spinosad) |
Heartgard Alternatives
| Medication | Mechanism of Action | Notes |
|---|---|---|
| Interceptor (milbemycin oxime) | Interferes with nerve transmission in parasites | Also protects against hookworms, roundworms, and whipworms. |
| Revolution (selamectin) | Interferes with nerve transmission in parasites | Topical application; also protects against fleas, ear mites, and sarcoptic mange. |
| Trifexis (milbemycin oxime + spinosad) | Milbemycin oxime: Interferes with nerve transmission; Spinosad: Affects nervous system of fleas | Combines heartworm prevention with flea control; oral administration. |
Heartgard Side Effects
| Common Side Effects | Serious Side Effects |
|---|---|
| Vomiting | Seizures |
| Diarrhea | Ataxia (loss of coordination) |
| Lethargy/Depression | Hypersalivation |
| Itching | Blindness (rare) |
Heartgard Dosage Guide
| Condition | Starting Dose | Maintenance Dose | Administration Notes |
|---|---|---|---|
| Heartworm Prevention | 68 mcg (dogs 0-25 lbs), 136 mcg (dogs 26-50 lbs), 272 mcg (dogs 51-100 lbs) | Same as starting dose, once monthly | Administer entire chewable tablet. Dosage is based on the dog’s weight. |
Heartgard Price With And Without Insurance
| Purchase Context | Estimated Price |
|---|---|
| With Insurance | $10 |
| Without Insurance (U.S.) | $25 |
| From CPS | $20 |


