Absence of shock-like reactions to ivermectin in dogs infected with Dirofilaria immitis.

Six dogs infected with Dirofilaria immitis and known to develop shock-like reactions after administration of diethylcarbamazine (DEC) were given ivermectin 50 micrograms/kg orally. None of the dogs showed any adverse reaction and subsequently all reacted to DEC 20 mg/kg orally.