Insulin pens are labeled to be sold as an individual unit, they are not to be broken up. I would be willing to bet PrePharm pharmacy got chargebacks, because they were dispensing TWO boxes of pens as a 30 day supply, when in reality TWO boxes was say a 40 day supply, so they should have only dispensed ONE box as a 20 day supply. Giving more boxes and rounding down the days supply is considered fraud and will get charge-backs. I have never, ever, heard of a pharmacy getting a chargeback for a single insulin pen box. Insurance companies recognize when boxes are labeled to be dispensed as an entire unit (such as insulin pens, eye drop bottles, amoxicillin bottles, etc.) and pharmacies are not penalized for rounding down the day supply on a single package.