Depends on the nature of the venom.
Here in Australia, just about all our snakes are elapids with neurotoxic venom.
The current medical advice over here is to strap the limb with a compression bandage about as tight as you would for a sprained ankle. This will slow the transport of the venom and buy you some time to get to a hospital where the correct antivenom will be administered once the snake has been identified (usually by testing the traces of venom on the bandage).
Start at the top of the limb and continue down to the bite. Splint the limb to immobilise it. Try & keep the patient calm.
If the victim has received a decent wet bite (ie puncture, not graze) from one of our more venomous snakes like the Taipan, Eastern Brown, or Tiger snakes and your not in a position to get the victim to the hospital, then put the victim in a position where they can kiss their ass good bye :thumbdn:
Oh I nearly forgot ... a good idea to write down the time/date of the bite on the bandage along with a brief description of the creature if you can
Oh I nearly forgot ... a good idea to write down the time of the bite with a brief description of the snake / creature.
Kind regards
Mick