First-aid protocols for snake bites may differ across local communities.

In most areas, the protocols for snake bites follow these main points: 

Activate EMS and monitor the AB-CABS.
While enroute (if transporting the patient) or waiting for EMS, immobilize the wound and apply pressure. Wrap it in a broad pressure bandage that extends above the wound on the limb, moderately tightly. The intent is to slow the spread of venom, but do not cut off circulation.
Splint the limb and have the patient lie still. After applying these steps, leave everything in place while monitoring the patient. Medical care professionals will remove the bandage at the correct time.

Be aware, however, that in some areas different protocols are now recommended by toxicologists for certain types of snake bite. This is particularly true of the Crotalidae subfamily of snakes in North America, which includes rattlesnakes, copperheads, and cottonmouths (pit vipers). Although there is variation in their specific venoms, according to toxicologists the venoms cause local tissue death, which may be made worse by holding the venom in a small area, which a pressure bandage above the bite attempts to do. They recommend: 

Activate EMS and monitor the AB-CABS.
While enroute (if transporting the patient) or waiting for EMS, wash the bite with soap and water, cover it with a dressing bandage and mark the leading edge of the swelling/tenderness. 

In all cases of snake bite, the following recommendations apply: 

Do not wait for signs and symptoms to contact EMS. Contact EMS immediately. 
If possible, note the time the bite occurred. 
If possible, photograph the snake (may help identify the species and aid treatment), but at a safe distance. Do not try to kill, capture or otherwise handle the snake. 
Do not apply a tourniquet. 
Do not attempt to suck out the venom, even with devices intended to do so. 
Do not apply ice or immerse the wound. 
Do not allow the patient to take pain relievers or drink alcohol, because these can aggravate the venom’s effects. 

Note that regional protocols for snake bites and other venomous injuries are based on local species, so follow local recommendations. 

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