[carbocation]

Not sure what you're referring to. I'm thinking of medications like injectables, which may not have a sufficient shelf life to permit getting the full set of supplies all at once. But most of the medications which are life-threatening if withheld (e.g., antiplatelet medications after a stent) can be obtained in bulk with a normal prescription.

[stallmanite]

I was thinking of Adderall specifically but in the case of Benzodiazepines, withdrawals can be fatal and they’re controlled substances so presumably ineligible for the 3 months prescription.

[carbocation]

Yes, I agree; while benzodiazepines are not generally considered life-saving medications, they can be life-threatening (like alcohol) if high tolerance is developed and cessation is abrupt.