Gardening

Been spraying it for years.

Unless you're totally into folk medicine,
• Use Tecnu to dissolve and wash away any surface oil.
• Use hydrocortisone. Nothing comes close. I tried them all.
- you can get a prescription for stronger than over-the-shelf hydrocortisone.
• If it's really bad, a doctor can prescribe Predinisone.

I am not finding pictures of my worst poison oak rash. (I must have mercifully deleted them)
Be prepared with a lot of gauze and cloth tape for when the blisters break.
It's not "contagious" at that point (some time after you get it) but messy.

YMMV, but sun does seem to bother inflamed skin.
I have pictures of poison oak "plants" some 20 feet tall. Those are easy to avoid.