Redback spiders

First aid for redback spider bites involves the application of ice packs for local pain relief. Pressure-immobilisation first aid is not required due to the slow progression of symptoms and compression bandages may increase the severity of local pain. The antivenom should be administered only if symptoms persist or intensify.

Medical Treatment Many cases of redback spider bite are mild and produce only moderate local pain. These cases do not require antivenom, but may benefit from the topical application of ice packs. Antivenom should be used in those cases which present with more than mild to moderate local pain or with systemic symptoms or signs of envenomation.

Administration of Antivenom The antivenom consists of a small volume (~ 0.5ml) of equine antibody, and is usually given by intramuscular injection. However, if envenomation is severe then intravenous administration should be used. The dose should not be reduced for children, whose lower body weight may make them more susceptible to severe envenomation. Unusually, administration of antivenom may be effective even several weeks after the bite. The rate of reaction to the antivenom is low (approximately 0.5% in one series). Premedication is usually not given prior to the administration of redback spider antivenom.