RSPCA Heartwormer Large Dogs (20-40kg) 6 Tablets

A once a month tablet to prevent heartworm in your dog whilst supporting the work of the RSPCA.

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Active Constituents

RSPCA Heartwormer Tablets for Small Dogs: each tablet contains IVERMECTIN 60 μg

RSPCA Heartwormer Tablets for Medium Dogs: each tablet contains IVERMECTIN 120 μg

RSPCA Heartwormer Tablets for Large Dogs: each tablet contains IVERMECTIN 240 μg


Heartworm preventative


RSPCA Monthly Heartworm Tablets prevent heartworm disease in dogs by eliminating the tissue stage of heartworm larvae (Dirofilaria immitis) that infected the dog in the month (30 days) before treatment.

General Directions

The proper dose should be given at monthly intervals during the period of the year when mosquitoes potentially carrying infective larvae are active. The initial dose must be given within one month of first exposure to mosquitoes. However, RSPCA Monthly Heartworm Tablets also control heartworm infection when treatment is initiated up to four months after exposure to infected mosquitoes, provided monthly treatment is continued for at least 12 months. The final dose must be given within one month after the last exposure to mosquitoes.

When replacing another heartworm preventive product in a heartworm disease preventive programme, the first dose of RSPCA Monthly Heartworm Tablets must be given within a month after the last dose of the former medication.

Give one appropriately sized tablet orally at monthly intervals. The tablet may be wrapped in food to encourage consumption. The dog should be closely observed for several minutes following administration to make sure that the entire dose has been consumed. If it is suspected that any of the dose has been lost, redosing is recommended.


This product should not be used in puppies under 6 weeks of age.


The dosage of Ivermectin required is 6μg per kg bodyweight once a month. Give 1 tablet containing the amount of ivermectin appropriate to the dog's weight as follows:

For small dogs up to 10kg give one 60μg tablet each month.

For medium Dogs from11 to 20kg give one120μg tablet each month.

For large dogs from 21 to 40kg give one240μg tablet each month.

(For dogs over 40kg bodyweight, another 1⁄2 tablet can be given for each additional 20kg of bodyweight.)

Safety Directions

Poisonous if swallowed. Will irritate eyes. Avoid contact with eyes. Wash hands after use.

If poisoning occurs, contact a doctor or Poisons Information Centre, phone 13 1126.


Dispose of empty container by wrapping with paper and putting in garbage.


Carton of 6 tablets


Store below 30oc (Room Temperature).

Poisons Schedule


More Information
Refrigerated Product No
Parasites Controlled Heartworm
Dose Form Tablet / Oral
Duration of Effect 1 month
Indication N/A
Manufacturer Not specified
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