Pharmacy tech here: Compliance, compliance, compliance.

If you're diabetic and you don't take your insulin (and eat junk food and smoke like a chimney), guess what? Your insurance won't cover your Metformin and you'll be paying out of pocket.

If you're on any kind of maintenance meds (Lipitor, Diovan, Bystolic, etc) and you skip your fills because you think you're better off taking it once a week rather than every day like it was written, guess what? Your insurance will stop covering it and your script will either be returned to you unfilled, or you will be presented with a 500 dollar bill.

If you're on nitrates and blood pressure meds, guess what? You can't have Viagra. Or if you con three doctors into writing you three different scripts for Viagra, your pharmacy will immediately notice it and your scripts will be voided for fraud.

Quit being lazy, and quit trying to game the drug system. It won't work and I get really sick of informing people that taking their heart medication is not optional if they want it to stay covered by their insurance.