From Austin Health - Melbourne.
Ants
If you have previously had a serious allergic or anaphylactic reaction to an ant bite: you should consult your doctor about the need for you to carry adrenaline for use in the event of a bite.
If you have been bitten inside the mouth or throat: ring 000 for an ambulance.
If you have been bitten by an ant and have previously had a serious allergic or anaphylactic reaction to an ant bite you should follow these steps:
Ring 000 for an ambulance
Administer your adrenaline if you have been instructed to use it in this situation
Lie down; do not stand or walk about
Wait for the ambulance
If you have been bitten by an ant and have NOT previously had a serious reaction to ant bite you should follow these steps:
Wash the bitten area with soap and water
Apply a cold pack to the area to relieve pain and swelling
If there is persistent or severe swelling and/or itching, take antihistamine tablets for 1-3 days
Antihistamines are available from pharmacies without a prescription. The pharmacist will be able to recommend one suitable for you.
Even if you have never been bitten by an ant before, watch for the following symptoms, they may indicate a serious allergic or anaphylactic reaction, which requires urgent medical attention:
red blotches on the skin or an itchy rash over the body
swelling in parts of the body away from the stung area, especially the lips and around the eyes
feeling faint, light-headed or dizzy
breathing difficulties such as wheeze or shortness of breath
chest tightness.
Dangerous ants in Victoria:
Jumper or Jack Jumper Ant (Myrmecia pilosula)
Bull or Bulldog Ant (Myrmecia pyriformis)
Green-head Ant (Rhytidopenera metallica)
"Blue Ant" (Diamma bicolor) (this is actually a type of wasp).
See link for treatment for anything that bites and stings in Victoria - very good site.
http://www.austin.org.au/page?ID=534