Here in Sweden they always ask: "Do you want the cheapest option?" when you buy prescribed medicine. If there's a reason for a specific manufacturer then that's stated on the prescription.
I've even had them say that the drugstore I'm at is out of the cheapest option and then ask if I want them to look up which drugstore is closest that has it in stock and if they should send them a note to save what I'm looking for so there's no chance it might sell out before I get there.

And there's also high-cost protection, an annual maximum amount (about $275) you can spend on prescribed medication and anything else healthcare-related. So any medication you buy and the cost of any medical services you use are added together and if that cost reaches the maximum amount within a year everything is free until the next year. So basically you can't pay more than $275 per year for medication and any other medical services.