Hi, Fiona...I have used an Echinacea tincture and fresh leaf poltice successfully on a brown recluse bite but have never been bit by the black widows that we frequently see and I don't have a plan...it would be good to have something on hand for a more dangerous venom...maybe someone else can help.
"We're all just walking each other home." -Ram Dass
"Be a lamp, or a lifeboat, or a ladder."-Rumi