APC's, probably not many around who remember when they were called that. "Take a couple of APC's and call me in the morning. "My Dad, the Doctor, ordered big bottles of them. When warranted, he would take one of his little pill envelopes, write instructions on the front, count out so many pills, and drop them in the envelope. They were the most popular pill he dispensed.
When we had our home and office together, 30's and 40's, Dad had his own dispensary in his office. Cough medicine, other liquids and pills, not sure what all he dispensed, but he had a lot of bottles, but I do remember the APC's. They were good for colds, fevers, headaches and a plethora of other symptoms.
I don't know when I bought my first aspirins, I always looked for APC's, and, then, one day, there were no more APC's, only aspirins. I asked a young Pharmacist today, about them, he had not heard the term. Made me feel old. As near as I can tell, it stood for Aspirin-Phenacetin-Caffeine.