
The American Diabetes Association (ADA) cites a study that found hospitalization rates were higher for patients who missed taking only 20% of their oral diabetes medications.
If you take prescription drugs regularly, or you've started a vitamin routine that has you taking various pills over the course of the day, it's helpful to portion those pills ahead of time and keep them with you.

Setting daily doses aside is also a good way to confirm that you took your meds. If you find yourself asking, "Did I take my pills this morning?", just check your pillbox.
For the ADA's pill-skipping article:
Skipping Pills May Put You in the Hospital