Baking soda poultice made with baking soda and just a few drops of water. Apply as soon as you see the bite, don't wait to see if its gonna be a nasty one, the sooner you draw out the toxins the better. I also mix in equal parts of cayenne pepper, it kills any bacteria and stops infection (optional).
Also take 3 500mg echinacea capsules, then one capsules every hour for the first day as you see improvement you can start to back off the dose to 3 caps twice a day making sure to always take a dose before bed.
This worked miracles on brown recluse bite. I will now make sure I always have plenty of echinacea on hand!