Merthiolate at our house, never mercurochrome
We didn't use it at home, but the camp nurse used to give coke syrup for upset stomachs. Lots of homesickness cured by coke syrup, too, is my guess!
There was always a bottle of paregoric in the fridge, mostly for toothache/teething babies
Vicks Vapo-rub. I still use it on my chest when I have a cold, or sometimes just sniff it.
Peroxide on cuts, as a mouth rinse, in our ears to dislodge wax
Butter on burns
My nana used to tape a coin onto us for something but I can't for the life of me remember why.
Epsom salts. My mom used to swear by Epsom salts as either a drink or a soak. She was bitten by her cat and soaked that wrist for a week until the day my sister dropped by. That wrist had red streaks right up to mom's armpit. She was in the hospital for 4 days on IV antibiotics, then had to go daily, then weekly, over the course of a month for more infusions, then onto oral antibiotics. That Old Wives Tale almost cost her her arm and her life.
Baking soda plasters for cuts, scrapes, burns (after the butter!)