Via climate controlled aircraft, distribution facilities, and relatively well ventilated delivery trucks?
No step in the retail pharmacy supply chain involves routinely putting it in a small black box sitting out in the sun until you get home from work in the evening.
I’d be utterly shocked if you’re correct. Controlled substances most likely do get some kind of kind of courier delivery, but there’s no reason to do it for anything else. If it needs to stay cold you slap in an insulated box with ice packs. I’ve gotten deliveries before from Blue Apron and Omaha Steaks. Believe me, they have no problem keeping things cold.
You seem to think I'm describing some special courier service. I'm not. I'm describing the standard USPS/UPS/FedEx experience all packages get, which is indeed how most of the stuff a retail pharmacy gets will be shipped.
The parent's concern with direct-to-home delivery is valid - the inside of an in-sun mailbox on a 90 degree day is going to well exceed safe thresholds for many medications in a way the rest of the shipping chain won't.
I can't speak for the others, but UPS definitely doesn't use climate controlled facilities or well ventilated trucks. In particular the semi trailers that transport packages between facilities are saunas in the summer and ice boxes in the winter after hours on the road.
No step in the retail pharmacy supply chain involves routinely putting it in a small black box sitting out in the sun until you get home from work in the evening.