Remove tentacles and<unk> 
Hot salt water immersion (inactivates heat labile toxins), submerging the area in 45 ℃ water for 20 minutes has been shown to provide significant pain relief
Stingose is a topical solution composed of 20% aluminum sulfate and 1.1% surfactant.
Used for pain control, venom removal via osmosis, & venom neutralization via denaturation of proteins and polysaccharides through interactions with the aluminum ion.
Consider topical lidocaine
Consider oral or parenteral analgesia for severe pain
In general, avoid acetic acid (vinegar) since it mostly increases the firing of<unk>  and therefore increases pain.
Some evidence that it does inhibit<unk> discharge in the Australian Box Jellyfish species 
Box Jellyfish: 4-5% acetic acid solution should be applied to the injured area for at least 30 seconds.
Symptomatic treatment for Irukandji syndrome
Consider fentanyl for pain and antihypertensives such as magnesium sulfate and nitroglycerin
Antivenom is only readily available in Australia for severe box jellyfish sting
Used for pain control, venom removal via osmosis, & venom neutralization via denaturation of proteins and polysaccharides through interactions with the aluminum ion.
Some evidence that it does inhibit<unk> discharge in the Australian Box Jellyfish species 
Box Jellyfish: 4-5% acetic acid solution should be applied to the injured area for at least 30 seconds.
Box Jellyfish: 4-5% acetic acid solution should be applied to the injured area for at least 30 seconds.
Consider fentanyl for pain and antihypertensives such as magnesium sulfate and nitroglycerin
Urine, ethanol, ammonia,
Acetic acid/vinegar (unless box jellyfish) 
Fresh or tap water (causes<unk> discharge via the osmotic gradient)
Nematocysts
Toxins
Pseudoparasites
Ciguatera
Ectoparasites
Scombroid
Tapeworm
Tetrodotoxin 