Kidnap pharmacist, make him open store and give you meds while standing down any security, leave him with IOU from the heads of all families concerned and whatever local government official you can get to sign off on it, then berate the ass for being a piece of **** that would allow children to die for a possible future gouged profit. That's what I would try to do if reason doesn't work at first.
Great answer!
(But I still think we should shoot the guard in the elbow!)