Downside to those is that over time, the pills will shift, turn to powder, etc. I just get little trial-sizes of OTC meds.
For prescription meds, just wrap a dose in a small piece of aluminum foil. Added bonus, mark on the foil to code what they are, if you have many. Then, just put them in an empty pill bottle. If you do use a pill case, just use cotton balls to keep them from all moving around a lot, and it will prevent most of the powder bit happening.