You're assuming it's every case.
Anyway, a simple example to show that the pharmacist doesn't catch everything wrong:
https://www.telegraph.co.uk/news/20...ctile-dysfunction-cream-dry-eye-prescription/
This was just a case of bad handwriting but it's
clearly wrong--why would a woman be prescribed an erection creme? (There are rare cases where erection tablets are useful for other purposes, but erection cremes are topical.)
That is a complete change of subject.
Dispensing errors that cause harm unfortunately happen.
And the pharmacist that does it can lose their license.
Working as a pharmacist takes total concentration. You cannot make errors.
It is probably easy to get a bad prescription past a community pharmacist. In the hospital it is much harder.
In a CVS for example there are so many prescriptions to fill you only have a few seconds to think about a drug. If you have a script in front of you where the dosage is within normal ranges you probably will not question it.
But if that drug causes harm another physician can easily come in and find out what the patient went to see the doctor about and what was prescribed.
This is not an easy crime to get away with.
And for what gain?
What does this woman get out of it?
It is easy to make threats, but when it comes time to carry it out the person can clearly see the benefit from the potential harm.