I am using small part each side of the bum, plus a couple of spots in the stomach. But why don't they describe further. Do they think it's a myth that lantus can work as fast acting even if not injected obvious in a vein or muscle, just being unlucky and hitting a bad place with a few small vessels? People should very much be informed about this severe effect from lantus, and all other long acting as well.
I'll take it then that no long acting insulins are guaranteed to not work rapidly, and if so, they should have been informing people about it. They are "just take this once a day, and remember to rotate." Let me say this, nobody should take a fast acting or eat anything 40 minutes after taking lantus, as it may mask any action or make a deadly drop even more deadly due to bolus.