Tylenol or ibuprofen started early and continued for 2 days can reduce discomfort and swelling.
Over the counter 1% hydro-cortisone cream applied 3 times daily may decrease swelling and pain, but only if used early. Use a moisturizing cream until you can get the steroid cream. Avoid petroleum or other ointments because they keep heat and sweat from escaping.
Cool baths or wet compresses several times daily. Add 2 oz baking soda per tub. Avoid using soap on the sunburned skin.
Extra fluids on the 1st day to prevent dehydration, dizziness, and replace fluids lost into the sunburn.
Trim skin of broken blisters to prevent infection
Apply over the counter antibiotic ointment to any open blisters. Remove it with warm water and reapply it twice daily for 3 days.