Abstract: Among other things, we describe an apparatus that includes a tubular body elongated along a longitudinal axis and having an interior cavity and a first open end, the interior cavity extending along the longitudinal axis and sized to receive multiple pharmaceutical pills, the interior cavity having a largest cross-sectional dimension perpendicular to the longitudinal axis that is sized to fit a single pharmaceutical pill within the cavity, the first open end sized to admit a pharmaceutical pill into the interior cavity, and a device to selectively allow insertion and removal of pills from the interior cavity.