Definition of OTC (over-the-counter)

1. Atrial Fibrillation Slideshow Pictures
2. Bad Bugs and Their Bites Slideshow
3. Understanding Ulcerative Colitis Slideshow

OTC (over-the-counter): Available without a prescription. OTC drugs are available without a prescription, simply "over the counter." OTC drugs are in contrast to prescription drugs that require a doctor's order.