From 1965 to 1995, New York University ran an animal research facility called the Laboratory for Experimental Medicine and Surgery in Primates. Chimpanzees and other primates were used for things like testing vaccines and experiment with transplants. But while the facility’s full name was the Laboratory for Experimental Medicine and Surgery in Primates, it was better known by its acronym – LEMSIP.
This predates the naming of the lemon-flavoured analgesic drink mix of the same name.
Given that there’s a slight overlap between the world of medical testing and the world of over-the-counter cold relief, I can’t help but wonder if this happened:
Someone at Reckitt Benckiser was reading a medical journal and saw a mention of the LEMSIP facility. “Heh, LEMSIP – that sounds more like the name of a hot lemon drink! Lol! Hey, wait – that could work. We’d just need to throw some paracetemol in it. Doris, get me the development team!”