Doctor-recommended children’s cough syrup was basically just smack In Victorian England we would very much rather get ill kids smacked up on morphine than listen to them cough, and so scientists invented cough medicine to do just that. Morphine, chloroform, codeine, more morphine, powdered opium, cannabis and heroin were all ingredients in ‘Children’s Soothing Syrup’ the 19th-century equivalent of Calpol. But you should see their 6+ version.