There are no prescriptions in Mexico.
Medications which are scheduled controlled substances (amphetamines, codiene, morphine, etc) are sold directly by hospitals. There really aren't many of these, and hospitals already have to stock most of them for surgical use.
Everything else is cash over the counter.
And pseudoephedrine is illegal because of pressure from the US.
Is it illegal in Mexico because meth comes from there in significant quantities?
The US said "you need to stop selling this without a prescription system". So Mexico stopped selling it entirely.
It's why you can only buy pseudoephedrine from pharmacists.
If there's a database with contraindicators, make it public, let people search it, require packaging to inform the public to search the database for contraindicators for their own safety before taking the drug. If people are really unsure, they can decide to engage a doctor or pharmacist instead of being forced to engage a doctor or pharmacist.
Hardware stores also sell many things that will kill you if used incorrectly. We can't have the world revolve around the least capable of us, it's holding everyone back.
A lot of “safety” concerns is just FUD spread by a system that wants to preserve itself.
And the world has not imploded.
There's a lot of chicken-little-ism around the prescription system