@Phu***
if all the crucial info is on the prescription, at it is on mine, you should normally be able to use it. That is substance, dosage, prescribed amount. Example (from an over the counter med):
Paracetamol 500 mg, 4 per day
I suspect that if they read "4 par jour", with "jour" reading closer to "hour" than "day", it could make them a little more cautious because they may be missing something. I would hope they then know the substance and that of those two options only "day" can be meant, and that they give you the required number of units.
Looking at the prescription that I've used, this 3rd part is actually missing. It's only substance and strength. Also I don't really need that as I know myself how much I need.
So maybe that has then put me in a better spot? 🤷 Don't know.
If it doesn't work in your case though, you may as well just get the prescription from a doctor. Why not. If cost is a concern, look for a cheap hospital or even a clinic.