I don't know if this has been discussed here before, but I encourage everyone to count the number of pills in your prescription bottle before you leave the pharmacy.
I recently had surgery ( microdisc) and received 2 prescriptions. I was reading a magazine that suggested you always check your prescriptions, so I thought, I'll count the pills in the 2 meds I just got, and was shocked that 10 days after surgery I had only 47 pills left from a prescription of 90. I had only taken a few of these as they were muscle relaxers and I really didn't need them. When I checked back to my medication log, I had only taken 13 of them.
I thought no problem, I'll just call the pharmacy and let them know they made an error and have them give me the rest of my precription. Well, after numerous phone calls, being hung up on by the pharmacist, and being treated like a "drug seeker" I finally got the problem resolved.
It is much more difficult to get the problem fixed once you have left the pharmacy. I hope no one else has trouble with this.