In Switzerland, I _can't_ buy more than ~2 [1] packages with 16 pills (500mg acetaminophen/paracetamol) at a time without a prescription from my doctor. And the biggest package size is 100, but that always needs a prescription. Also, you can only buy it at a pharmacy anyway.

[1]: it depends a bit on the pharmacy/pharmacist, sometimes you can get away with 3, but they start asking questions and propose you just come back again when you used up the 2 packages they are willing to sell to you.