My Dad was a dispensing chemist and I'm hazy on the detail but I remember he had a poison book where all poisons sold had to be entered up and all poisons and drugs were kept under lock and key. He practised from 1933 until he retired in his 70s.
I have some old pharmacy recipe books dating from late 19th C - they keep cropping up on various threads. This thread has prompted me to look at them just now and have found a recipe for Infant's Whooping Cough Mixture containing Belladonna - that's deadly nightshade, there's a 'Pick-Me-Up' containing 'Tinct. Opii' that I assume is an opiate - Tinc. Opii is used a lot, Tinct. Digitalis (foxglove) for asthma and heart problems, morphine is used a lot in cough and chest remedies.
Also, on a seasonal note, I have just found a recipe for making fireworks

. Perhaps this doesn't help much with Mike's query but I thought it might be of interest.
Maggie