The suspect has hit at least five locations across two counties in recent weeks. Police have now released video of the man as he carried out the crimes.
The armed robber has hit five pharmacies in five months and he's not going for drugs, but cash.
He strikes while employees are opening up the store. Surveillance video released from his first robbery at a CVS store in Yeadon shows him armed with a silver gun. He forces his way inside while a young woman is opening the store.
He makes her lock the door from behind and directs her to the safe.
"He makes them open the safe and get money out. He's getting significant amounts of money and threatening them with a gun," said J.J. Klaver of the FBI.
Video was also released from a robbery about a month later along Lincoln Drive. Investigators say he tells the victims he's only there for the money.
He's calculated, investigators say, making sure he doesn't touch anything in the store.
"These robberies happen fairly quickly," Klaver said. "He gets in and gets out."
So far about $20,000 has been stolen. Police believe the suspect may be driving a silver four-door, possibly a Dodge Charger, to commit the robberies.
The crimes scenes span the area from Germantown to Lansdowne to Yeadon.
Police want you to take a close look at the armed robber. He doesn't reveal much in the surveillance video but police say he always wears a backpack.
"He's worn some distinctive coats and Roca sweatshirts pulled up," Klaver said.
So far no one has been injured but authorities worry that, if these crimes continue, that could change.