NBC Nightly News (1/22/19) carried a story about people purchasing insulin (which may or may not require a prescription) in Mexico because the same drug costs approximately 10% of the US price.
One person said they were purchasing a one-years supply for 104 USD versus 1400, had it been purchased in the US.
It would appear that this "might" be a federal crime FDA Basics, however the FDA link does not specify if this misdemeanor applies only for prescription drugs.
So, is insulin covered? Does it make a difference if it is obtained in Mexico without a prescription?
If it is not illegal, and a prescription is not required, is there anything to prevent a person from purchasing (in Mexico) say, five years worth and then "giving" the insulin to their US friends for a donation of 104$ to cover expenses.
Lastly, how would a person declare such purchases at the border? (based on US market price or actual price paid)?