Like September Morn says, the doctor wouldn't have time or inclination and there's no "law" saying you have to take or fill prescriptions. There's lots of problems with people not getting them filled in the first place because they can't afford to! There's no way for anyone to tell why/that you didn't get something filled (for all a pharmacy knows, you've gone to a new doctor and gotten a different prescription or gone to a different pharmacy, etc.). The pharmacy doesn't have any "reminder" calendar or anything, they just look at when you got something filled before to make sure you aren't getting refills too often! But people who abuse drugs do so easily as they go to different doctors and pharmacies both so get multiple prescriptions filled for the same/similar stuff (pain pills comes to mind, Rush Limbaugh). Pharmacies only tell if they're required to by law and to save their butt. Doctors can often tell if you get something filled/don't because you get better/worse. But think of people who save their medicine and overdose, maybe multiple times . . .