Police were sent to a silent alarm at Uptown Drug, 1610 15th Street, just before 3 a.m. Tuesday, January 31, 2012.
Officers clearing the business found 17-year-old Michael Fahrenkrug behind the pharmacy counter.
Police said Fahrenkrug was wearing a black stocking cap, black hooded sweatshirt, dark-colored bandana and jeans when they found him.
Fahrenkrug was charged with burglary. He was held at the Rock Island County Jail in lieu of $10,000 bond.