What Dave Bryant said "I have travelled to France many times (and even worked there for a while) and have never been asked by customs if I was carrying aspirin, paracetamol or any other medicinal drug." That seems to be right on point.

Yes, of course there are pharmacies and aspirin in France. However, when there's a 2% chance that I will realize at 10 pm that a headache is trying to get me, then I need the aspirin right then and there.

We always carry small amounts of medication (in their packaging) for just these eventualities.