In 1830, John B. McMunn introduced his elixir of "purely vegetable" ingredients that "no family should be without." It "cures coughs, colds, quiets fussy babies, tetanus, rabies." It was also a brain tonic, and cure for hay fever, headaches and male impotency. It was so useful as an aid to endurance that Ernest Shackleton took it on his Antarctic expeditions. What was it? Pure opium. In reality, people weren't cured, but they were so stoned they just didn't care.
Are there any cure-alls in bridge? Yes. What is it? Thoughtful consideration.