Laudanum was very popular in Britain but largely unknown in the United States until about 1945.

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Laudanum was a popular drug in both Britain and the United States during the 19th century. It contained opium and was used to treat a variety of ailments such as pain, cough, and diarrhea. Its popularity declined in the 20th century as other drugs became available, and it was eventually recognized as highly addictive and dangerous.

Laudanum Was Very Popular in Britain but Largely Unknown in the United