MADISON, Wis. -

Madison police are investigating a robbery at a Walgreens pharmacy Wednesday.

A man entered the Walgreens at 2121 S. Park St. just after 4 p.m. and produced a note that demanded OxyContin, according to a Madison Police Department incident report.

Police said no weapon was seen.

Investigators believe this robbery may be related to a recent rash of OxyContin-related robberies.

Police said the robber is described as a white man in his late 20s to early 30s, standing 6 feet tall and weighing about 160-170 pounds. He was wearing a tan waist-length coat with a hood up.

Anyone with information about the robbery should call Crime Stoppers at 608-266-6014.