1. a person who enjoys taking medication which come in pill form.
2. a person addicted to taking any and various types of pills, does not necessarily have to be medicinal. Could be agents, vitamins, tea-pills, etc...
the person usually has no need for the pills being taken, the act of taking pills is a habit, done for recreational purposes, routine, mental and physical self satisfaction and relief.
The name pill-popper comes from the noise a pill bottle makes when you pop the lid off, and/or the actual act of throwing(popping) the pill into your mouth.