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See a medical professional immediately for treatment, even if you think the bite isn't serious. After all, it's easy to incorrectly identify a spider bite. It's a good idea to get an large antihistamine injection as soon as you can, even if you don't know the type of spider bite. While anti-venom is available in most ambulances, it might be a little while before the proper one can be selected and administered. This will help slow the spread of the venom and bring down the swelling. If you believe the bite is from a Brazilian wandering spider, apply a warm compress. This will help reduce blood pressure in the area. If the bite is on an arm or a leg, elevate the limb and tie a snug bandage above the bite. You should also move as little as possible to slow the spread of the venom. Be careful not to cut off circulation when tying the bandage. If you believe you are dealing with a redback bite, don't tie a bandage around the area. Redback venom spreads slowly, so the bandage won't do much except worsen the pain. Even if the spider is squashed, try to save it and bring it with you to the medical facility. Blood tests can reveal the type of spider bite, but having the specimen can speed up the identification and treatment process. Rubbing alcohol can be used to preserve a spider.
Get immediate medical care. Apply an ice pack. Slow the venom's spread. Bring the spider with you to the medical facility, if you can.