Bethany Scott, 26, of the 200 block of Woodlawn Avenue, was taken into custody Tuesday night while Special Operations officers were severing a search warrant at a residence, according to Lt. Jim Cunningham.
Scott had emerged as a suspect earlier in the day by officers investigating the robbery.
Scott was in the store the day before and captured on surveillance tape, Cunningham said.
Scott is charged with aggravated robbery and drug abuse. She also had an outstanding bench warrant.
The robber, wearing a mask and with a gun, told the pharmacist, Give me all the Percocets and no one will get hurt,” according to a police report.
WATCH: Opioid abuse making job 'more dangerous,' pharmacists say
Cunningham said Percocet pills were found at the residence and cash. Police believe Scott may have sold some of the medication.
Also arrested as a result of a search warrant was Timothy Stevens for drug abuse and possession of drug paraphernalia.
NEW: Download the free Journal-News app, Butler County's #1 source for local news
About the Author